MCQ Chemical Reaction and Equations
1: What is the colour and formula of Sodium Sulphate?
(a) Colourless Na2SO4 (b) White Na2SO4 (c) Colourless NaSO4 (d) White Na(SO4)2
2: During respiration, glucose and oxygen combines in the cells of our body when energy is released. What is the best way to describe the reaction that takes place during the process of respiration? .
(a) Oxidation (b) Endothermic (c) Exothermic (d)Displacement
3: What becomes the colour of iron nails after they have been kept in the blue solution of copper sulphate for about 20 minutes?
(a) White (b) Reddish brown (c) Green (d) Blue
4: Barium chloride and sodium sulphate react to produce -
(a) BaSO4 & NaCl (b) Ba2SO4 & NaCl (c) BaSO4 & Na2Cl (d) None of these.
5: The action of water on quick lime is an example of which type of reaction?
(a) Combination (b) Displacement (c) Decomposition (d) Redox
6: What is the nature of the new product which is formed by the action of water on quick lime?
(a) Neutral (b) Acidic (c) Amphoteric (d) Basic
7: CaO and CO2 are produced by heating CaCO3. What is the type of the reaction and the process?
(a) displacement reaction and endothermic process
(b) decomposition reaction and exothermic process
(c) decomposition reaction and endothermic process
(d) combination reaction and endothermic process
8: When ferrous sulphate is heated the following reaction takes place:
2FeSO4 (s) --------> Fe2O3 (s) + SO2 (g) + SO3 (g)
The above reaction is called __________ of ferrous sulphate.
(a) Thermal Displacement (b) Combination (c) Thermal Decomposition (d) Double displacement
9: How the colour changes when the gases after thermal decomposition of ferrous sulphate come in contact with an acidified solution of potassium dichromate?
(a) Green to orange (b) Orange to green (c) Blue to green (d) Red to colourless
10: What is the color of solid ferrous sulphate?
(a) Blue (b) Red (c) Light green (d) Light yellow
11: What is the odor of the gases produced on thermal decomposition of ferrous sulphate?
(a) Like rotten eggs (b) Like burning sulphur (c) Sweet smell (d) Fruity smell
12: What is the color of the residue left in the test tube after thermal decomposition of ferrous sulphate?
(a) White (b) Black (c) Green (d) Yellowish brown
13: Heating ferrous sulphate is an example of which type of reaction?
(a) Thermal decomposition (b) Thermal analysis (c) Double decomposition (d) Catalytic decomposition
14: Which one is a double displacement reaction?
(a) BaCl2 + Na2SO4 --------> BaSO4 + 2NaCl
(b) CaO + H2O ------------> Ca(OH)2
(c) 2Pb(NO3)2 --------> 2PbO + 4NO2 + O2
(d) Zn + 2AgNO3 ----------> Zn(NO3)2 + 2Ag
15: The heating of ferrous sulphate is an example of __________ reaction and the reaction between iron and copper sulphate is an example of __________ reaction.
(a) displacement, decomposition (b) decomposition, displacement
(c) combination, displacement (d) combination, decomposition
16: A black mass is obtained on strongly heating a mixture of iron fillings and sulphur powder. When this black mass was treated with dilute sulphuric acid a gas with smell of rotten eggs is liberated. The gas is -
(a) SO3 (b) SO2 (c) a mixture of SO2 and SO3 (d) H2S
17: Following is the reactivity series in decreasing order of their reactivity -
Magnesium > Zinc > Iron > Lead > Copper > Silver > Gold
Which one of the following metals can displace copper from copper sulphate solution?
(a) Zn (b) Ag (c) Au (d) None
19: What is the color of the solution of copper sulphate?
(a) Green (b) Light green (c) Blue (d) Pink
20: Which type of reaction takes place when an iron nail is dipped in a solution of copper sulphate?
(a) Combination (b) Displacement (c) Double displacement (d) Decomposition
21: Which one is the correct statement about the reaction?
Fe(s) + CuSO4(aq) ----> FeSO4(aq) + Cu(s)
(a) Iron is more reactive than copper (b) Iron is less reactive than copper
(c) In this reaction Cu2+ is oxidized and Fe is reduced (d) Copper is more reactive than iron
22: What is the colour of the aqueous solution of sodium sulphate?
(a) Blue (b) Green (c) Colourless (d) Purple
23: What is the colour of the aqueous solution of Barium chloride?
(a) Blue (b) Green (c) Colourless (d) Purple
24: What is the colour of the precipitate which is formed when aqueous solutions of sodium sulphate and barium chloride are mixed?
(a) Yellow (b) White (c) Green (d) Orange
25: Name the precipitate formed when aqueous solutions of sodium sulphate and barium chloride are mixed?
(a) Barium sulphate (b) Sodium sulphate (c) Barium hydroxide (d) Barium sulphate
26: What is the type of the reaction between sodium sulphate and barium chloride?
(a) Decomposition (b) Direct combination (c) Single displacement (d) Double displacement
Answer: 1:a 2:c 3:b 4:a 5:a 6:c 7:c 8:c 9:b 10:c 11:b 12:d 13:a 14:a 15:b 16:d 17:a 19:c 20:b 21:a 22:c 23:c 24:b 25:d 26:d
Part 2
1: What is the colour and formula of Sodium Sulphate?
(a) Colourless Na2SO4 (b) White Na2SO4 (c) Colourless NaSO4 (d) White Na(SO4)2
2: During respiration, glucose and oxygen combines in the cells of our body when energy is released. What is the best way to describe the reaction that takes place during the process of respiration? .
(a) Oxidation (b) Endothermic (c) Exothermic (d)Displacement
3: What becomes the colour of iron nails after they have been kept in the blue solution of copper sulphate for about 20 minutes?
(a) White (b) Reddish brown (c) Green (d) Blue
4: Barium chloride and sodium sulphate react to produce -
(a) BaSO4 & NaCl (b) Ba2SO4 & NaCl (c) BaSO4 & Na2Cl (d) None of these.
5: The action of water on quick lime is an example of which type of reaction?
(a) Combination (b) Displacement (c) Decomposition (d) Redox
6: What is the nature of the new product which is formed by the action of water on quick lime?
(a) Neutral (b) Acidic (c) Amphoteric (d) Basic
7: CaO and CO2 are produced by heating CaCO3. What is the type of the reaction and the process?
(a) displacement reaction and endothermic process
(b) decomposition reaction and exothermic process
(c) decomposition reaction and endothermic process
(d) combination reaction and endothermic process
8: When ferrous sulphate is heated the following reaction takes place:
2FeSO4 (s) --------> Fe2O3 (s) + SO2 (g) + SO3 (g)
The above reaction is called __________ of ferrous sulphate.
(a) Thermal Displacement (b) Combination (c) Thermal Decomposition (d) Double displacement
9: How the colour changes when the gases after thermal decomposition of ferrous sulphate come in contact with an acidified solution of potassium dichromate?
(a) Green to orange (b) Orange to green (c) Blue to green (d) Red to colourless
10: What is the color of solid ferrous sulphate?
(a) Blue (b) Red (c) Light green (d) Light yellow
11: What is the odor of the gases produced on thermal decomposition of ferrous sulphate?
(a) Like rotten eggs (b) Like burning sulphur (c) Sweet smell (d) Fruity smell
12: What is the color of the residue left in the test tube after thermal decomposition of ferrous sulphate?
(a) White (b) Black (c) Green (d) Yellowish brown
13: Heating ferrous sulphate is an example of which type of reaction?
(a) Thermal decomposition (b) Thermal analysis (c) Double decomposition (d) Catalytic decomposition
14: Which one is a double displacement reaction?
(a) BaCl2 + Na2SO4 --------> BaSO4 + 2NaCl
(b) CaO + H2O ------------> Ca(OH)2
(c) 2Pb(NO3)2 --------> 2PbO + 4NO2 + O2
(d) Zn + 2AgNO3 ----------> Zn(NO3)2 + 2Ag
15: The heating of ferrous sulphate is an example of __________ reaction and the reaction between iron and copper sulphate is an example of __________ reaction.
(a) displacement, decomposition (b) decomposition, displacement
(c) combination, displacement (d) combination, decomposition
16: A black mass is obtained on strongly heating a mixture of iron fillings and sulphur powder. When this black mass was treated with dilute sulphuric acid a gas with smell of rotten eggs is liberated. The gas is -
(a) SO3 (b) SO2 (c) a mixture of SO2 and SO3 (d) H2S
17: Following is the reactivity series in decreasing order of their reactivity -
Magnesium > Zinc > Iron > Lead > Copper > Silver > Gold
Which one of the following metals can displace copper from copper sulphate solution?
(a) Zn (b) Ag (c) Au (d) None
19: What is the color of the solution of copper sulphate?
(a) Green (b) Light green (c) Blue (d) Pink
20: Which type of reaction takes place when an iron nail is dipped in a solution of copper sulphate?
(a) Combination (b) Displacement (c) Double displacement (d) Decomposition
21: Which one is the correct statement about the reaction?
Fe(s) + CuSO4(aq) ----> FeSO4(aq) + Cu(s)
(a) Iron is more reactive than copper (b) Iron is less reactive than copper
(c) In this reaction Cu2+ is oxidized and Fe is reduced (d) Copper is more reactive than iron
22: What is the colour of the aqueous solution of sodium sulphate?
(a) Blue (b) Green (c) Colourless (d) Purple
23: What is the colour of the aqueous solution of Barium chloride?
(a) Blue (b) Green (c) Colourless (d) Purple
24: What is the colour of the precipitate which is formed when aqueous solutions of sodium sulphate and barium chloride are mixed?
(a) Yellow (b) White (c) Green (d) Orange
25: Name the precipitate formed when aqueous solutions of sodium sulphate and barium chloride are mixed?
(a) Barium sulphate (b) Sodium sulphate (c) Barium hydroxide (d) Barium sulphate
26: What is the type of the reaction between sodium sulphate and barium chloride?
(a) Decomposition (b) Direct combination (c) Single displacement (d) Double displacement
Answer: 1:a 2:c 3:b 4:a 5:a 6:c 7:c 8:c 9:b 10:c 11:b 12:d 13:a 14:a 15:b 16:d 17:a 19:c 20:b 21:a 22:c 23:c 24:b 25:d 26:d
Part 2
- Respiration is:
(a) Endothermic reaction | (b)Exothermic reaction |
(c) Addition reaction | (d) None |
- Photolysis is:
(a) Decomposition | (b) Addition |
(c) Displacement | (d) Oxidation |
- Fe2O3 + 3CO → 2Fe + 3CO2, which is reducing agent in the above reacton:
(a) Fe2O3 | (b) CO |
(c) Fe | (d) CO2 |
- What are the conditions for rusting of an iron article:
(a) Presence of air | (b) Presence of moisture |
(c) Both | (d) None |
- Plaster of Paris is
(a) 2CaSO4.H2O | (b) CaSO41/2H2O |
(c) Both | (d) None |
- Oxidation reaction is a chemical process in which a substance:
(a) Gains hydrogen | (b) Gains oxygen |
(c) Gains chlorine | (d) None |
- Hydration means:
(a) addition of hydrogen | (b) addition of hydrogen chloride |
(c) addition of sulphuric acid | (d) addition of water |
- The decomposition of CaCO3 is
(a) an endothermic reaction | (b) an exothermic reaction |
(c) an photolysis reaction | (d) None |
- Hydrogenation means :
(a) addition of hydrogen | (b) addition of hydrogen chloride |
(c) addition of sulphuric acid | (d) addition of water |
- Al(OH)3 + HCl → AlCl3 + _______
(a) H2O | (b) H2 |
(c) AlCl3 | (d) None |
- A solution of substance X is used for white washing. What is X:
(a) CaO | (b) Ca(OH)2 |
(c) CaCO3 | (d) CaCl2 |
- What happens when dil HCl is added to iron filing:
(a) Hydrogen gas and iron chloride are produced | (b) Cl2 gas and Iron hydroxide are produced |
(c) No reaction takes place | (d)Iron salt and water is produced |
- Fe2O3 + 2Al → Al2O3 + 2Fe
The above reaction is an example of a:
(a) Combination reaction | (b) Double displacement reaction |
(c) Decomposition reaction | (d) displacement reaction |
- Nitrogen gas is used by chips manufacturer since:
(a) Nitrogen is an oxidizing agent | (b) Nitrogen gas is a reducing agent |
(c) Nitrogen is an antioxidant | (d) None. |
- AB + CD → AD + CB
The above reaction is an example of
(a) Displacement | (b) Double displacement |
(c) combination | (d) oxidation |
- Which of the following are the characteristics of a chemical reaction:
(a) Evolution of gas | (b) formation of precipitate |
(c) change in color | (d) all |
- CH4 + O2 → CO2 + ________
(a) Hydrogen | (b) water |
(c) CO | (d) none |
- A balance chemical equation has :
(a) an equal number of atom | (b) an equal number of mass |
(c) an equal number of protons | (d) an equal number of electrons |
- In chemical reaction:
(a) only electron takes part | (b) only protons take part |
(c) only neutrons take part | (d) none |
- Na is placed in kerosene oil since:
(a) Na is soft | (b) Na is highly inflammable |
(c) Na is metal | (d) none |
- The properties of product in a chemical reaction is
(a) same as that of reactant | (b) different as that of reactant |
(c) Both | (d) none |
- Rust is chemically defined as:
(a) Fe2O3.xH2O | (b) Fe3O4.xH2O |
(c) Fe2O3.2H2O | (d) Fe3O4.xH2O |
- Food items can be preserved for longer time when kept in a refrigerator since:
(a) The reduction process starts in refrigerator | (b) the oxidation process starts in refrigerator |
(c) At lower temperature oxidation process gets slowed | (d) None |
- When sodium reacts with Cl2, the molecular formula of product in Balance equation is
(a) 2NaCl | (b) NaCl |
(c) 3NaCl | (d) NaCl2 |
- We apply paint on iron article to
(a) Prevent from corrosion | (b) improve the hardness |
(c) make it attractive | (d) None |
Answers
1 | (a) Endothermic reaction | 14 | (c) Nitrogen is an antioxidant |
2 | (a) Decomposition | 15 | (b) Double displacement |
3 | (b) CO | 16 | (d) all |
4 | (c) Both | 17 | (b) water |
5 | (c) Both | 18 | (a) an equal number of atom |
6 | (b) Gains oxygen | 19 | (a) only electron takes part |
7 | (d) addition of water | 20 | (b) Na is highly inflammable |
8 | (a) an endothermic reaction | 21 | (b) different as that of reactant |
9 | (a) addition of hydrogen | 22 | (a) Fe2O3.xH2O |
10 | (a) H2O | 23 | (c) At lower temperature oxidation process gets slowed |
11 | (a) CaO | 24 | (a) 2NaCl |
12 | (a) Hydrogen gas and iron chloride are produced | 25 | (a) Prevent from corrosion |
13 | (d) displacement reaction |
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