CBSE Class 10, Science (Chemistry)
CHEMICAL REACTIONS AND EQUATIONS
CBSE NCERT solutions of Multiple Choice Questions (MCQs)
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
CBSE NCERT Solution of Science Multiple Choice Questions MCQs
Class 10th Science Practical Skills - Types of Chemical Reactions
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.
No comments:
Write comments