CBSE Board Important Question For SA_1-2014

10th Chemistry Some Important CBSE BOARD Question solution

Q. An aluminium can is used to store ferrous sulphate solution. It is observed that in a few days

holes appeared in the can. Explain the cause for this observation and write chemical equation to support your answer

Ans: Reactivity of aluminium is far mor than iron(Fe). Because of high reactivity aluminium displaces iron from its sulphate solution and made its sulphate sulution i.e. , aluminium sulphate. and thats why holes appeared.

2Al + 3FeSO4 = Al2(SO4)3 +3 Fe

Q. What do you mean by the term hydrated salt? Give two examples of hydrated salts which are white and state their chemical formula. Why is tooth paste used for cleaning teeth?

Ans: Hydrated salts are those salts which contains some water of crystallization.

For example: MgSO4.7H2O,SnCl2.2H2O

When we wake up at morning our mouth contains sliva of pH=4.1(acidic) due to presence of more lactic acid, which can decay our teeth so we use toothpaste which contains some alkaline compound which neutralizes the acidity of our mouth and protect from decaiying of teeth.

Q.Why do we store silver chloride in dark bottles?

An: we store silver chloride in dark bottles because of to prevent them from direct sunlight .when silver chloride is exposed to light , it decomposes to form silver metal chlorine gas .

2AgCl ----> 2Ag +Cl2

Q. What Happens When Chlorine Is Passed Over dry Slaked Lime? Write The chemical equation involved in the reaction. mention Three properties Of The Product?

Ans: When chlorine is passed through dry slaked lime power Ca(OH)2 , bleaching powder is obtained .

Ca(OH)2 + Cl2 ------> CaOCl2 + H2O

CaOCl2 is bleaching powder

The three properties Of bleaching powder , (CaOCl2) are

It is a yellowish white powder with a strong smell of chlorine

It reacts with carbon dioxide , dil. HCl and di. H2SO4 to form chlorine gas.

It is soluble in water but since it is generally contaminated with Ca(OH)2 , it may produce a milky solution.

Q. why zinc is used in the galvanization of iron and not the copper?

Ans: Zinc is more reactive than iron, it is used to protect it from corrosion because when oxygen in the air reacts with the surface of zinc, a very dense and impermeable coating of zinc oxide is formed and it is this physical barrier that protects the zinc surface from further attack.

Copper is a less reactive metal and it is difficult to form alloys with iron and go on a separate layer. Therefore it is not used for galvanization.

Q. why does the colour of copper sulphate crystals change on heating ?

Answer: The colour of the compound before heating is blue, and after heating is white-grey because the water molecules are lost on heating and copper sulphate pentahydrate is converted to anhydrous copper sulphate.

CuSO4 . 5H2O ---Heat--à CuSO4 + 5H2O

CCE CBSE SAMPLE PAPER X SCIENCE SA-1 Term First

          CCE CBSE SAMPLE PAPER X SCIENCE

General Instructions:

i). The question paper comprises of two sections, A and B.  You are to attempt both the sections.

ii). All questions are compulsory.

iii). There is no overall choice.  However, internal choice has been provided in all the five questions of

five marks category.  Only one option in such questions is to be attempted.

iv). Questions 1 to 4 in section A are one mark questions.  These are to be answered in one word or

one sentence.

v). Questions 5 to 13 in section A are two marks questions.  These are to be answered in about 30

words each.

vi). Questions 14 to 22 in section A are three marks questions.  These are to be answered in about 50

words each.

vii). Questions 23 to 25 in section A are five marks questions.  These are to be answered in about 70

words each.

1. Give an example of an exothermic reaction.

2. Write electronic configuration of an element having atomic number 11.

3. Two resistors of 20 W and 40 W  are connected in parallel in an electric circuit. How  does the current passing through the two resistors compare ?

4. State the main function of abscisic acid in plants.

5.Oxidation and reduction processes occur simultaneously.” Justify this statement with the help of an example.

6.Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate”

(i)Translate the above statement into a chemical equation.

(ii) State two types in which this reaction can be classified.

7. Write the chemical name and formula of bleaching powder. How is it prepared ?

8. Give reason for the following :

(a) Ionic compounds have usually high melting and boiling points.

(b) Metals are good conductors of electricity whereas non–metals are not.

9. State the factors on which the resistance of a cylindrical conductor depends. How will resistance of a conductor change if it is stretched so that its length is doubled ?

10.  In an experiment to study the relationship between the potential defference across a resistor and the current through it a student recorded the following observations :

Potential difference (V)          2          3                4.5            5          6

Current (A)                            0.08       0.12          0.15       0.20     0.24

Find in which one of the above sets of reading the trend is different from others and must be rejected. Calculate the mean value of resistance of the resistor based on the remaining sets of readings.

11. What is a solenoid ? Draw the pattern of magnetic field lines of a solenoid through which a steady current flows.

12.  How do guard cells regulate opening and closing of stomatal pores ?  13.

13. State the role of the brain in reflex action.

14. Design an activity to show a decomposition reaction in which light is used to decompose  a reactant. Write chemical equation of the reaction and state its one use.

15. What compound is Plaster of Paris ? How is it prepared ? What happens when it is mixed with water and allowed to stand ? Mention two applications of this property of Plaster of Paris.

16.  Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9 respectively. Which solution is (a) neutral (b) strongly alkaline (c) strongly acidic (d) weakly acidic and (e) weakly alkaline.

Arrange the pH in increasing order of H–ion concentration.

17. Define electric current and state its SI unit. With the help of Ohm’s law explain the meaning of 1 Ohm resistance

18. The rating of an electric heater is 1100W; 220V. Calculate its resistance when it operates at 220V. Also calculate the energy consumed in  kWh in the month of November if the heater is used daily for four hours at the rated voltage.

19. An air conditioner of rating 2000W; 220V is operated in a domestic circuit (220V) that has a current rating of 5A. What result do you expect ? Justify your answer.

20. Draw a neat diagram to show structure of neuron and label on it the following :

cell body, axon, dendrite

21. State in brief the process of harnessing kinetic enargy of the wind to do work. Mention any four limitations of harnessing wind energy on a large scale.

22. How is nuclear energy generated ? State in brief the process of utilizing this energy in the production of electricity. Mention the major hazard of nuclear power generation.

23. Describe in short an activity to (i) demonstrate the pattern of magnetic field lines around a straight current carrying conductor, and (ii) find the direction of magnetic field produced for a given direction of current in the conductor. Name and state the rule to find the direction of magnetic field associated with a current carrying conductor. Apply this rule to determine the direction of the magnetic field inside and outside a current carrying circular loop lying horizontally on a table. Assume that the current through the loop in anticlockwise

24. (a)  list two differences between calcinator and roasting.

(b) An element ‘X burns in oxygen to form an electrovalent compond XO. State the compounds you expect will form if the element X is made to combine with (i) chlorine and (ii) sulphur. Mention the Chemical formula and nature of bond present in each case.

25. What are magnetic field lines ? How is the direction of a magnetic field at a point  determined ? Draw the magnetic field lines (including field directions) of the magnetic field  due to a circular coil of current. Name any two factors on which the magnitude of the  magnetic field due to this coil depends.

X Chemistry Ch - 05 Periodic Classification of Elements CBSEQuestions Bank

1 mark questions:- Question from Board papers

1. What is the name given to group of three similar elements by Dobereiner?

2. State "Newlands law of Octaves" for classification of elements.

3. Name the fundamental property used by Mendeleev as the basis of classification.

4. How many groups and periods are there in the Modern periodic table?

5. What was the prediction of Mendeleev regarding the gaps in his periodic table?

6. How is valence of an element determined?

7. What will be the valence of an element having atomic number 16?

8. How does valence vary in going down a group?

9. Why inert gases have zero valences?

10. What would be the valence of an atom containing 8 electrons in its outermost shell?

11. How does the electronegative character of elements vary along a period of the periodic table?

12. The present classification of elements is based on which fundamental property of elements?

13. Among first ten elements in the modern periodic table name the metals present.

14. Metals are on which side of Modern periodic table?

15. State Mendeleev’s periodic law.

16. Name two elements, other than Gallium, whose existence was predicted by Mendeleev.

17. State Modern Periodic law.

18. Write the name given to the vertical columns in a periodic table.

19. What name is given to the horizontal rows in a periodic table?

20. Why does silicon is classified as Metalloid?

2 marks question:-

21. State two limitations of Newland's law of Octaves.

22. Name the scientist who proposed modern periodic law? On which fundamental property of elements it is based?

23. Why could no fixed position be given to hydrogen in Mendeleev’s Periodic table?

24. What are metalloids? Give two examples.

25. In group 1 of periodic table three elements X, Y and Z have atomic radii 133 pm , 95pm and

65pm respectively giving a reason, arrange them in the increasing order of their atomic number in

the group.

26. In modern periodic table, the isotopes of Chlorine Cl-35 and Cl-37 having different atomic

masses will be kept in different slots or they would be assigned same position on the basis of their

chemical properties? Give reason in support of your answer.

27. Nitrogen (At no. 7) and Phosphorus (At no. 15) belong to group 15 of the periodic table:-

(i) Write the electronic configuration of the two.

(ii) Predict whether they are metallic or nonmetallic in nature.

28. How and why does the atomic size vary as you go down a group?

29. Why was Dobereiner system of classification of elements into triads not found to be useful?

3 marks questions:-

30. State three merits of Modern periodic table.

31. What are amphoteric oxides? Choose the amphoteric oxide from among the following oxides :–  Na2O, ZnO, Al2O3, CO2, H2O

32. Study the variation in the atomic radii of first group elements given below and arrange them in increasing order :–

Group I element                     Na     Li        Rb           Cs          K

Atomic Radii P.M                  86     152     244          262        231

33. An element X has the electronic configuration as 2, 8, 7 :–

(a) What is the atomic number of the element?

(b) What will be the formula of its compound formed with Na?

(c) What is the name given to the family of this element?

34. How do you calculate the valence of the element from its electronic configuration?  What  is

the valence   of Mg with atomic number 12 and sulphur with atomic number 16? How does the 

valence vary in going down in a group?

35. Atomic radii of the elements of the period II are as follows:–

Period II elements :      Be  B  O  N  C  Li

Atomic Radius :  111  88  66  74  77  152

(i) Arrange them in decreasing order of their atomic radii.

(ii) How does the atomic size vary on moving from left to right in a period? Explain why?

(iii) How will the tendency to lose electrons will vary on moving from left to right in this period II?

36. Oxygen (O, 8) and sulphur (S, 16) belong to group 16 of the periodic table:-

(i) Write the electronic configuration and valence of these two elements?

(ii) Which among these will be more electronegative? Why?

37. The positions of three elements A, B and C in the periodic table are given below:-

(i) State element C is a metal or nonmetal.

(ii) Which is smaller B or C and why?

(iii) Which type of ion will be formed by A, B and C?

5 marks questions:-

38. Two elements ‘A’ and ‘B’ belong to group 1 and 2 respectively in the same period.

Compare them with respect to :–

(a) Number of valence electrons.      (b) Valency               (c) Metallic character                                     
(d) Size of atom                               (e) Formulae of their oxides.

39. From the table answer the following questions:–

(a) Write the formulae of chloride of A.

(b) What is the electronic configuration of ‘S’?

(c) Name the noble gas.

(d) Write the formula of compound which carbon forms with G.

(e) What name is given to the family of group 17 element?

40.An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide.
(a) Where in the periodic table are elements X and Y placed?
(b) Classify X and Y as metal (s), non-metal (s) or metalloid (s).
(c) What will be the nature of the oxide of element Y? Identify the nature of bonding in the compound formed.
(d) Draw the electron dot structure of the divalent halide.

10th science Chemistry-CHEMICAL REACTIONS AND EQUATIONS

CHEMICAL REACTIONS AND EQUATIONS
FORMATIVE ASSESSMENT I
Q. PAPER I  MARKS-30 TIME- 70 MINUTES
Instructions:
Questions : 1 to 5 – 1 Mark each
Questions : 6 to 9 – 2 Marks each
Questions : 10 to 13 – 3 Marks each
Question 14 – 5 Marks
1. On what chemical law, balancing of chemical equation is based?
2. Identify the compound oxidized in the following reaction:
H2S (g) + Cl2 ---> S (s) + HCl (g)
3. Give an example of photochemical reaction.
4. Name the reaction which forms insoluble salts.

10th SA-1-Acid Base and Salt Trend Setter Question Paper

1: Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?

Ans: Hydrogen gas is usually liberated when an acid reacts with a metal.fig 2.1 page 19  

Take few pieces of zinc granules and add 5 ml of dilute H₂SO₄. Shake it and pass the gas produced into a soap solution. The bubbles of the soap solution are formed. These soap bubbles contain hydrogen gas.                 

2H₂SO₄    +     Zn   →  Zn(SO₄)₂   +  2H₂  

We can test the evolved hydrogen gas by its burning with a pop sound when a candle is brought near the soap bubbles.

2: Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.

             CaCO₃  (s)   +    HCI(aq)    →   

CaCI₂(aq) + CO₂   + H₂ O (I)

3 : Why do HCl, HNO₃, etc., show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character?

Ans: The dissociation of HCl or HNO₃ to form hydrogen ions always occurs in the presence of water. Hydrogen ions (H⁺) combine with H₂O to form hydronium ions (H₃O⁺).     

HCI -------->   H⁺  +  CI ^–      H⁺     +     H₂ O -->   H₃ O⁺

Although aqueous solutions of glucose and alcohol contain hydrogen, these cannot dissociate in water to form hydrogen ions. Hence, they do not show acidic character.

4  Why does an aqueous solution of an acid conduct electricity?

Ans.:   Acids dissociate in aqueous solutions to form ions. These ions are responsible for conduction of electricity.

5.   Why does dry HCl gas not change the colour of the dry litmus paper?

Ans. : Colour of the litmus paper is changed by the hydrogen ions. Dry HCl gas does not contain H⁺ ions. It is only in the aqueous solution that an acid dissociates to give ions. Since in this case, neither HCl is in the aqueous form nor the litmus paper is wet, therefore, the colour of the litmus paper does not change.

6. While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid?

Ans.:  Since the process of dissolving an acid in water is exothermic, it is always recommended that acid should be added to water. If it is done the other way, then it is possible that because of the large amount of heat generated, the mixture splashes out and causes burns

7: How is the concentration of hydronium ions (H₃O⁺) affected when a solution of an acid is diluted?

Ans. : When an acid is diluted, the concentration of hydronium ions (H₃O⁺) per unit volume decreases. This means that the strength of the acid decreases.

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CBSE TEST PAPER SCIENCE Class-10 Chapter 3. Metal and Non-metals

CBSE TEST PAPER SCIENCE Class-10 Chapter 3. Metal and Non-metals

1. Explain why the surface of some metals acquire dull appearance when exposed to air for a long time. (2 marks)

2. What are amphoteric oxides? Give examples two amphoteric oxides. (2 marks)

3. State two ways to prevent the rusting of iron. (2 marks)

4. Why is aluminum extracted from alumina by electrolytic reduction and not by reducing with carbon? (2 marks)

5. The reaction of a metal X with Fe2O3 is highly exothermic and is used to join broken railway tracks. Identify metal X. Write the chemical equation of its reaction with Fe2O3. (2 marks)

6. Metal sulphides occurs mainly in rocks and the metal halides occur mostly in seas and lakes. What could be the reason for this difference in behavior? (2 marks)

7. Amit took sulphur powder on a spatula and heated it. He collected the gas evolved byinverting a test

(i) What will be the action of gas an (a) dry litmus paper? (b) Moist litmus paper?

(ii) Write a balanced chemical equation for the reaction taking place.

8. Which gas is produced when diluted hydrochloric acid is added to a reactive metal? Write the chemical reaction. When iron reacts with dilute H2SO4. (2 marks)

9. Why do ionic compounds have high melting points? (2 marks)

10. Define the terms: (3 marks)(i) Mineral(ii) Ore and(iii) Gangue

11. Explain how the following metals are obtained from their compounds by the reaction process:

(i) Metal ‘X’ , which is low in reactivity series.

(ii) Metal ‘Y’, which is middle in reactivity series.

(iii) Metal ‘Z’ which is high up in the reactivity series. (3 marks)

12. Give reasons: (3 marks)

(i) Platinum, gold and silver are used to make jewellery.

(ii) Sodium, potassium and lithium are stored under oil.

(iii) Aluminium is a highly reactive metal, still it is used to make utensil for cooking.

13. (i) What is corrosion of metals? Name one metal which does not corrode and one whichcorrodes on being kept in atmosphere.(ii) How will you show that the rusting of iron needs oxygen and moisture at the same time?

14. Give reasons: (5 marks)

(i) The surface of some metals acquires a dull appearance when exposed to air for a long time.(ii) Sodium is kept immersed in kerosene oil.

(iii) A salt which does not conduct electricity in the solid state becomes a good conductor in molten state.

(iv) Ionic compounds have generally high melting points.

(v) An iron grill is painted frequently.

15. What is an alloy? How is an alloy made? List two purposes of making alloys. Mention the constituents and two properties of each of the following alloys:(i)Stainless steel (ii)Brass(5 marks)

CBSE Acid base and salt Short type Questions with solution for 10

Chemistry Adda  VERY SHORT QUESTIONS ANSWER

Q.1. Name two natural indicators.

Ans. Litmus solution, beet-root extract and turmeric solution.

Q.2. Name the acid present in vinegar and lemon.

Ans. In vinegar acetic acid is present and in lemon it is citric acid.

 Q.3. What is an Alkali. 

Ans. The base that dissolves in water is called alkali.

Q.4. What is the colour of methyl orange in acidic solution.

Ans. The colour of methyl orange is pink in acidic solution.

Q.5. In a solution phenolphthalein turns pink. What is the nature or solution?

Ans. The solution is basic.

Q.6. Hydrogen ion concentration of an acid is 1×10-2 mol/L, what is its pH.

Ans. Its pH is 2.

Q.7. pH of one solution is 7, is it acidic basic or neutral.

Ans. Solution with pH no 7 is neutral.

Q.8.Which has a higher pH value, 1M HCl or 1M NaOH

solution. Ans. 1M NaOH solution has higher pH value.

Q.9. Name two strong and two weak acids.

Ans. Strong acid: Hydrochloric acid and Nitric acid. Weak acid: Acetic acid and carbonic acid.

 Q.10. Name the gas formed when sodium hydroxide reacts with zinc.

Ans. Hydrogen gas is formed when NaOH reacts with zinc.

Q.11. What is bleaching powder?

Ans. Bleaching powder is a mixture of CaOCl2 .Ca(OH)2 .CaCl2 .2H2O.

Q.12. Write the chemical formula for washing soda.

Ans. Chemical formula for washing soda is Na2CO3.10H2O.

Q.13. Write the chemical name of baking soda.

 Ans. Its chemical name is sodium hydrogen carbonate.

Q.14. Write one domestic use of sodium carbonate. 

Ans. It is used as a cleansing agent.

Q.15. What happens when gypsum is heated at 373 K.

Ans. When gypsum is heated at 373 K .it changes to plaster of paris. 

CaSO4. 2H2O → CaSo4. ½ H2O +1 ½ H2O 

Gypsum                              Plaster of Paris

Q.16. Doctors use paste of a white substance in water to maintain a 
fractured bone in its place. Identify the substance and write its chemical formula.

Ans. Name of the compound: Plaster of Paris.

Acids Bases and Salts

2 and 3 Marks questions

Q 1.What are indicators ? Name some common indicators

Ans. Indicators are substances that undergo definite color change in acids and bases solution. Some common indicators are – Litmus solution, methyl orange, phenolphthalein etc.

Q.2. What are alkalis? Write three examples.

Ans. The bases which dissolve in water to give OH- ions in solution are called alkalis, such as- NaOH, KOH, Ca(OH)2.

Q3. While diluting the acid, why is it recommended that acids should be added to water and not water to acid?

Ans. Mixing of water and acid is a highly exothermic process. When water is added to acid , due to small amount of water, evolved heat will change it to vapour and acid will spill out and may cause injury. So it is advised to mix acid to water and not water to acid.

Q4. Write the composition of baking powder. What will happen if tartaric acid is not added to it?

Ans. Baking powder is a mixture of sodium bicarbonate and tartaric acid. This acid neutralizes sodium carbonate formed on decomposition of baking soda. If tartaric acid is not present in baking powder‘, the food materials such as cake will taste bitter due to the presence of sodium carbonate.

Q5. What isBleaching powder? How is it prepared and write its two uses.

Ans. Bleaching powder is Calciumoxychloride and its formula is CaOCl2. It is prepared by passing chlorine gas through slaked lime.

Ca(OH)2+Cl2 CaOCl2+Cl2

Two uses of bleaching powder-

1. It is used to disinfect water

2. It is used to bleach cotton and paper

Q.6. A student working in the laboratory added some water to a syrupy liquid taken in a tube. The tube immediately cracked and the liquid which escaped out of it, produced blisters on the skin of the student. What actually happened?

Ans. The syrupy liquid was concentrated sulphuric acid. On adding water, large amount of heat is released. For this reason the tube cracked and the acid produced blisters on the skin.

Q.7. The pH of rain water collected from two cities A and B was found to be 6 and 5 respectively. Water of which city is more acidic? Find out the ratio of hydrogen ion concentration in the two samples of the rain water.

Ans. Rain water with pH 5 obtained from city B is more acidic than the rain water of city A. The ratio of hydrogen ion concentration can be calculated as below: For city

A: pH= -log[H+]=1

6= -log[H+]

Log[H+]= -6

[H+]= 10^-6

Similarly,

for city B,

we can have [H+]=10^-5

Ratio of [H+] of samples

= 10^-6/10^-5

= 1/10

Q.8. A compound X of sodium is commonly used for making crispy pakoras. It is also used for curing acidity in the stomach. Identify ‗X‘. What is its formula? State the reaction that takes place when it is heated.

Ans. The compound X is baking soda, a constituent of baking powder. Its chemical name is sodium hydrogen carbonate and its formula is NaHCO3.

On heating this compound gives CO2 gas.

2NaHCO3 (s) ------> Na2CO3 + H2O + CO2 


Q.9. Dry hydrogen chloride gas does not turn blue litmus whereas hydrochloric acid does. Give one reason.

Ans. In the dry state, hydrogen chloride (HCl) does not release H+ ions. Therefore, it cannot behave as an acid. When dissolved in water, it forms hydrochloric acid. It dissociates to give H+ ion in solution and behaves as an acid. HCl (aq) -----> H+ (aq) + Cl- (aq)

Q.10. Why is Plaster of Paris written as CaSO4. ½ H2O ? How is it possible to have half a water molecule attached to CuSO4?

Ans. The actual formula of Plaster of Paris is 2CaSO4.H2O which means that one molecule of H2O is associated with two molecules of CaSO4. The formula for simplicity is written as CaSO4. ½H2O.

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