10th Chemistry Assignment For - FA3 Chapter: Carbon and its Compounds

 Chemistry Assignment-I (For month of November)  Chapter:(carbon and its compounds)

1. An organic compound X with a molecular formula C2H6O undergoes oxidation with in presence of alkaline KMnO4 to form a compound Y. X on heating in presence of Conc. H2SO4 at 443K gives Z. Which on reaction with H2Oin presence of H2SO4 gives back `X` `Z` reacts with Br2 (aq) and decolorizes it. Identify X, Y, & Z and write the reactions involved.

2. An organic compound ‘A’ is widely used as a preservative in pickles and has a molecular formula C2H2O2. This compound reacts with ethanol to form a sweet smelling compound ‘B’.

(i) Identify the compound ‘A’

(ii) Write the chemical equation for its reaction with ethanol to form compound ‘B’.

(iii) How can we get compound ‘A’ back from ‘B’?

(iv) Name the process and write corresponding chemical equation.

(v) Which gas is produced when compound ‘A’ reacts with washing soda? Write the chemical equation.

3. Hydrocarbon `X` and `Y` having molecular formulae C3H8 and C3H6 respectively. Both are burnt in different spatula on the Bunsen flame. Indicate the color of the flame produced by `X` and `Y`. Identify `X` and `Y`. Write the structural formulae.

4. A compound `X` has molecular formula C4H10. It undergoes substitution reaction readily than addition reaction. It burns with blue flame and is present in LPG. Identify `X` and give the balanced equation for its combustion and substitution reaction with Cl2 in presence of sunlight.

5. `A` compound works well with hard water. It is used for making shampoos & products for cleaning clothes. A is not 100% biodegradable and causes water pollution. `B` does not work well with hard water. It is 100% biodegradable and does not create water pollution. Identify A & B.

6. An organic compound P with molecular formula C2H6Ois an active ingredient of all alcoholic drinks. It is also used in medicines such as tincture iodine, cough syrups. Identify `P`. Drop a small piece of sodium into the test tube containing `P`.A new compound `Q` is formed with the evaluation of colorless and odorless gas Name the gas evolved and compound `Q` write the chemical reaction.

7. A cyclic compound `X` has molecular formula C6H6. It is unsaturated and burns with sooty flame. Identify `X` and write its structural formula. Will it decolorize bromine water or not and why?

8. An organic compounds `A` is a constituent of antifreeze and has the molecular formula C2H6O upon reaction with alkaline KMnO4, the compound `A` is oxidized to another `B` with formula C2H6O2. Identify the compound A` and `B`. Write the chemical equation for the reaction which leads to the formulation of `B`

9. Two compounds `X` and `Y` have the same formula C2H4O2. One of them reacts with sodium metal to liberate H2 and CO2 with NaHCO3. Second one does not reacts with Na metal and NaHCO3 but undergo hydrolysis with NaOH to form salt of carboxylic acid and compound `Z` which is called wood spirit. Identify `X`, `Y`, and `Z` and write chemical equation for the reaction involved.

10. A compound `X` with molecular formula C2H4 burns with a sooty flame. It decolourise bromine water. Identify `X`. Will it dissolve in water or not? Will it conduct electricity in aq. Solution? Will it have high melting point or low melting point?

11. Write the formula for ‘ethanoic acid’ and name the functional group present in it.

12. Allotropy is a property shown by which class: - Substances, elements, compounds, mixture.

13. What is the use of oxyacetylene flame?

14. Name the gas which is formed by decomposition of plants and animal matter in marshy areas?

15. How will you distinguish between ethanol and ethanoic acid by a suitable chemical test? Write chemical reactions involved.

16. Write the molecular formula and structures of benzene.

17. Match the following:-

(a) Ethane - Used in anti freeze solution.

(b) Ethanol - fruity smell.

(c) Ester - fossil fuel.

18. Complete the following reactions:-

(a) CH3COOH + NaHCO3  ----conc.H2SO4------>

(b) HCOOH + CH3OH     --------->

(c) CH3COOC2H5 + H2O --------->

19. Name the compound CH3COOC2H5.Name the acid and alcohol from which it is made, write equation.

20. Two alkanes A and B have 4 and 6 carbon atoms respectively in their molecule. In which physical state will they occur at room temp?

Aoms and Molecules class 9 Solved questions For FA3

CHEMISTRY Solved ASSIGNMENT-2 CLASS-9 ATOMS AND MOLECULES

Q1 State law of conservation of mass.

Ans The mass can neither be created nor destroyed in a chemical reaction.

Q2  State law of constant proportion.

Ans A pure chemical compound always consists of the same elements that are combined together in a fixed proportion by mass.

Q4  Define atomic mass unit.

Ans The mass of one twelfth (1/12) of the mass of one atom of carbon taken as 12.

Q5   What are molecules?

Ans  Molecules represents a group of two or more atoms(same or different) chemically  bonded to each other and held tightly by strong attractive forces.    Molecules are of two types

(a) Molecules of elements              (b) Molecules of compound

Q6 What do you mean by molecular mass?

Ans The average relative mass of the molecule as compared to the mass of carbon taken  as 1u.

Q7  Write the relationship between number of moles and atomic mass.

Ans     Number of moles=given mass/gram atomic mass

Q8  Why are chemical reactions according to law of conservation of mass?

Ans In all chemical reactions, there is only exchange of reactants taking place when products are  formed. Since there is no loss or gain of mass,the chemical reactions are according to law of conservation of mass.

Q9 What is basic difference between atoms and molecules?

Ans Atoms except those of noble or inert gas elements cannot exist of their own. However , all molecules can have independent existence.

Q10 The atomic mass of an element is in fraction .What does it mean?

Ans If the atomic mass of an element is in fraction, this mean that it exists in the form of isotopes. The atomic mass is the average atomic mass and is generally fractional.

Q11 What is the difference between the mass of molecule and molecular mass?

Ans:  Mass of a molecule is that of a single molecule also known as its actual mass. But molecular mass is the mass of Avogadro’s number of molecules.

Q12 Where do we use the words mole and mol?

Ans In the text part we use the word mole while as a  unit ,we call it mol.

Q13 How many moles are present in 11.5 g of sodium?

Ans  Gram atomic mass of Na =23g

11.5g of Na represents= (1mol)*(11.5g)/23.5g)=0.5 mol

Q14 Explain why the  number of atoms in one mole of hydrogen gas is double the number of atoms in one mole of helium gas?

Ans Hydrogen gas is a diatomic in nature(H2) while helium gas is monoatomic (He).As a result, the number of atoms in one mole of hydrogen(2*NA )are expected to be double as  compared to number of atoms in one mole of helium(NA)

Q15An element Z forms an oxide with formula Z2O3. What is its valency?

Ans  Valency of Z=3                                                                                                  

Q16   The valency of an element A is 4 . Write the formula of its oxide.

Ans The formula of its oxide is A₂O₄ or AO₂.

Q17  An element X has valency 3 while the element Y has valency 2.Write the formula of the compound between XandY .

Ans  X₂Y₃

Q18 What are ions?

Ans Ions are of two types          (a) cations  - positively charged         (b) anions  -  negatively charged

Q19  Which postulate of Dalton’s Atomic theory is the basis of law of conservation of  mass?

Ans “ Atoms can neither be created nor destroyed during a physical or a chemical change”

Q20 Write the formulae of sodium oxide and aluminium chloride

Ans   Sodium oxide = Na₂O             Aluminium chloride =AlCl₃

Q21  Find out the ratio by mass of the combining elements in the following  compounds

(a) MgCO3     (b)  CH3OH     (c) CaCl2                                                                                

Ans21    (a) MgCO3  ------   Mg :C:O  = 24:12:48 = 2:1:4

                (b) CH3OH    ------ C : H : O =12:4:16  =3:1:4

                (c) CaCl2          ----------- Ca :Cl = 40:71

Q22  Define atomicity of the molecule.

Ans   Atomicity of the molecule is the number of atoms present in the molecule.

Q23  What is the atomicity of  oxygen,ozone,neon and sulphur?

Ans   Oxygen O₂  = 2                    Ozone O₃  = 3         Neon  Ne  =1               Sulphur S₈ =8

Q24 What is wrong with the statement '1 mol of hydrogen'

Ans The statement is not correct.We must always write whether hydrogen is in atomic form or molecular form. The correct statement is :        1mole of hydrogen atoms or one mole of hydrogen molecules .

Q25 The atomic mass of an element is in fraction. What does it  mean?

Ans If the atomic mass of an element is in fraction, this mean that it exists in the form of isotopes. The atomic mass is the average atomic mass and is generally fractional.

Related post to 9th Atoms and Molecules

IX(9th)Chemistry Ch 03: Solved Questions
9th Atoms and molecules Study Notes, Q & A
CBSE Test paper-1
CBSE Test paper-2
CBSE Test paper-3
Numerical based on mole concept
Solved questions For FA-3
Self-evaluation on Mole concept
Question bank By CBSE Pathshala For CBSEGuess Questions

CBSE IX Atoms and molecules Sample Test Paper 2014

Sample Test Paper 
Class – IX Subject -Science Atoms and molecules 

Time 1 hr          M.M.35 

(Section A) 10 x 1 = 10 

1. The atomic radius of hydrogen atom is 

a. 0.037 nm b. 0.037 x 10 -9 m  c. both a &b   d. none 

2. Complete the following sentence: In water, the proportion of hydrogen and oxygen is ---------- by mass

a. 1:8 b. 3:4 c. 9:0 d. none 

3. The actual mass of hydrogen atom 

a. 1.673 x 10 ^-24 g b. 1.673 x 10 c.1u d. both a & b 

4. The symbol of cobalt a.C.o. b. CO c. Co. d. none 

5. Atomicity of noble gases is one 

a. True b. false c. can’t say d none 

6. The molecular mass of sulfuric acid 

a. 28 u b. 108 u c. 98u d. none 

7. What are the number of electron and proton in chlorine ion 

a. 17p & 18 e b. 18 p & 17 e c. 17 e & 0 e d. none 

8. The value of symbol ‘L’ a. 6.022 x 10²³ b. 6.022 x 10^-23 c. 0.622 x 10²³ d. none 

9. What is the mass of of 0.2 moles of oxygen atoms? 

a. 2.3 g b. 3.2 g c. .32 g d. none 

10. Write the atomicity of CO₂ gas a. 2 b. 3 c. 0 d. none 

(Section B) 10 X 1 = 10

1.what is meant by saying “the atomic mass of oxygen is 16? 

2. What is the significance of formula H₂O? 

3. Calculate the formula mass of calcium chloride and sodium carbonate 

4. An element Z forms an oxide ZO₃. What is the valency of Z? 

5. Write the Latin names of sodium, iron, mercury and tin. 

6. Define 1 u. 

7. Define electro negativity of any atom. 

8. Name the element represent by the following symbols Hg, Pb, Au, Ag and Sn 

9. Write down the atomicity of carbon dioxide, oxygen, ozone, solid sulphur. 

10. Write down the atomicity of carbon dioxide, oxygen, ozone, solid sulphur. 

(Section C) 5 x 2 = 10 

1. Write down the atomicity of carbon dioxide, oxygen, ozone, solid sulphur. 

2. Give major draw –backs of Dalton’s atomic theory of matter. 

3. Work out the formula of magnesium chloride. 

4. The mass of a single atom of an element X is 2.65 x 10 ^-23g. What is its atomic mass? What could this element. 

5. Calculate the molar mass of the following Ethyne and nitric acid 

(Section D) 2 x 2.5 = 5 

6. State the law of conservation of mass. Give one example also. 

7. In an experiment, 1.288 g of copper oxide was obtained from 1.03 g of copper. In another experiment 3.672 g of copper oxide obtain from the 2.938 g of copper. Show that these figures verify the law of constant proportion.

Other Educational Portals :  jsuniltutorial.weebly.com       

Related post to IX(9th)  Atoms and Molecules

1. IX(9th)Chemistry Ch 03:Atoms and Molecules Solved Questions
2. 9th Atoms and molecules Study Notes, Q & A
3. CBSE Test paper-1
4. CBSE Test paper-2
5. CBSE Test paper-3
6. Numerical based on mole concept
7. Solved questions For FA-3
8. Self-evaluation on Mole concept

10th CARBON AND ITS COMPOUNDS (Quick Exam Preparation)

CARBON AND ITS COMPOUNDS QUICK PREPARATION PAPER
1. If the pH of water is two, out of soap and detergent which one will you usefor cleaning clothes? (1)

2. An organic compound X with a molecular formula C2H6O undergoes oxidation with in presence of Alkaline KMnO4 to form a compound Y. X on heating in presence of conc. H2SO4 at 443k gives Z which on reaction with H2O in presence of H2SO4 gives back ‘X’ ‘Z’ reacts with Br2 (aq) and decolorizes it. Identify X, Y &Z and write the reactions involved. (3)

3. An organic compound ‘A’ is widely used as a preservative in pickles and has a molecular formula C2H2O2 . This compound reacts with ethanol to form a sweet smelling compound B.(i) Identify the compound A.

(ii) Write the chemical equation for its reaction with ethanol to formcompound ‘B’

(iii) How can we get compound ‘A’ back from B?(iv)Name the process and write corresponding chemical equation (3)

4. Hydrocarbons X and Y have melting points-1900 C & -900 C respectively.Which one of these has minimum carbon in the molecule &why? (2)

5. Three bottles without labels contain alcohol, ethanoic acid and soap solution separately how will you test which bottle contains what. (3)

6. A compound X has molecular formula C4H10.It undergoes substitution reaction more readily than addition reaction. It burns with blue flame and is present in LPG. Identify ‘X’ and give the balanced equation for its combustion and substitution reaction with Cl2 in the presence of sunlight. (3)

7. A compound ‘A’ works well with hard water. It is used for making shampoos and products for cleaning clothes. A is not 100%biodegradable and causes water pollution. ‘B’ does not work well with hard water. It is 100%biodegradable and does not create water pollution. Identify A&B. (1)

8. Can we use sodium metal for drying alcohol, why? (2)

9. Complete and balance following equation:-

a) CH2=CH2 + H2 --Heat---------->

b) CH4+O2 -------------------->

10. Two alkanes A and B have 4 and 6 carbon atoms respectively in their molecule. In which physical state will they occur at room temp?

11.Give a test that can be used to differentiate chemically between butter and cooking oil.

12. How will you distinguish between ethanol and ethanoic acid by a suitable chemical test? Write chemical reactions involved.

13. Complete the following reactions :-

(a) CH3COOH + NaHCO3 --coc. H2SO4-------->

(b) HCOOH + CH3OH----------->

(c) CH3COOC2H5 + H2O------------>

14. Name the compound CH3COOC2H5.Name the acid and alcohol from which it is made .write equation.

15. MCQ MULTIPLE TYPE QUESTIONS

Q 1. Which of the following is not a saturated hydrocarbon?

(i) cyclohexane. (ii) benzene.  (iii)butane (iv) isobutene

Q2. The bond between two identical non metallic atom has a pair of electron?

(i) unequally shared between two atoms.

(ii) transfercompletely from one atom to another.

(iii) with identical spins

(iv) equally shared between them.

Q 3. Covalent compounds are genarily

(i) solubal in water
(ii) insolubal in water
(iii)ionize in water
(iv)hydrolyse in water

Q 4. Propane with the molecular formula C3H8 has

(i) 7 covalent bonds
(ii) 8 covalent bonds
(iii) 9 covalent bonds
(iv) alcohol

Q 5. A hydrocarbon reacts with ammonical cuprons chloride Solution to form a red pricipate .The hydrocarbon is

(i) ethane
(ii) ethane
(iii) 2 - pentyne
(iv) 1- propyne

Q 6.Which of the following substance is added to denature Ethanol?

(i) methanol
(ii) pyricline
(iii) copper sulphate
(iv) all of them

Q7. Which of the following is not an allotropic form of carbon

(i) fluronie
(ii)fullerence
(iii)diamond
(iv)graphite

Q8.Detergents are sodium or potassium salts of long chain of ;-
(i) aldehydes
(ii) ketones
(iii) carboxylic acid
(iv)sulphonic acid

Q9.Which of the following represents the correct increasing order Of unsaturated carbon ?

(i)alkanes , alkenes , alkynes
(ii)alkanes , alkaynes , alkenes
(iii)alkenes , alkynes , alkanes
(iv) alkynes , alkanes , alkenes

Q10. In double covalent bond there is sharing of

(i) 2 electrons
(ii) 4 electrons
(iii) 6 electrons
(iv) 3 electrons

Downloadable file :
10th_carbon_compounds_ncert_solved_questions
10th_carbon_and_its_compounds_mcq
Carbon_and_its_compounds_solved_paper 1 , 2,3,4,5
10th Carbon_and_its_compounds_test_paper-1,2,3          Download Link

10th NCERT SOLUTION Carbon and its Compounds

CBSE ADDA: CARBON AND ITS COMPOUNDS F.A. - III Class 10

CBSE ADDA: CARBON AND ITS COMPOUNDS F.A. - III Class 10:

CARBON AND ITS COMPOUNDS F.A. - III-2011-12 TIME: 40 min. Max. Marks. -40.
1. Name the compound formed on heating ethanol at 443 K with excess of conc. H2SO4.1
2. What happens when a small piece of sodium is dropped into ethanol?1
3. Write the chemical equation for the decarboxylation reaction of ethanoic acid.1
4. Give an example of esterification reaction.1
5. Name the product obtained when ethanol is oxidized by either chromic anhydride oralkaline Potassium per manganate. 1
6. Write the chemical equation representing the preparation reaction of ethanol from ethene.1
7. Name the two elements which are present both in CNG and petroleum. 2

8. Draw the electronic dot structure of ethane molecule (C2H6). 2
9. Write the IUPAC name of the next homologue of CH3OHCH 2 CH3 2
10. Define homologous series of organic compounds. Mention any two characteristics of homologous series. 2

11. Describe a chemical test to distinguish between ethanol and ethanoic acid. 2
12. Give the name of functional groups. (i) –CHO (ii) –C = 0 2
13. Why does carbon form compounds mainly by covalent bonding? 2
14. Give a chemical test to distinguish ethanol from ethanoic acid. 2
15. Allotropy is a property shown by which class: Substances, elements, compounds or Mixtures? Give one example of allotropy. 2

16. How may be the following be obtained from ethanol? Express giving chemical equations.
(i) Ethyl ethanoate (ii) Sodium ethoxide. 2
17. Describe with chemical equation how ethanoic acid may be obtained from:
(i) Ethanol (ii) methanol 2
18. Explain the cleansing action of soap. 3
19. Distinguish between esterification and saponification reactions of organic compounds. 3
20. Explain the structure of graphite in terms of bonding and give one property based on this Structure.3
21. Name the organic acid present in vinegar. Write a chemical equation which represents the Commercial method for the preparation of this acid from methanol.