MCQ Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations

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Chemical Reactions and Equations Class 10 MCQs Questions with Answers

Question 1.
The reaction of acetylene and hydrogen in presence of heated nickel powder is called :
(a) Substitution
(b) Dissociation
(c) Addition
(d) Decomposition.
Answer:
(c) Addition

Question 2.
When a piece of iron is dropped into the CuSO₄ solution, iron displaces copper and forms ferrous sulphate. This reaction is called :
(a) Substitution
(b) Addition
(c) Dissociation
(d) Decomposition.
Answer:
(a) Substitution

Question 3.
The substitution is characteristic of:
(a) Alkenes
(b) Alkynes
(c) Carbon monoxide
(d) Paraffins.
Answer:
(d) Paraffins.

Question 4.
Ammonium chloride when heated gives NH₃ and HCl which on cooling again forms NH₄Cl. This reaction is called :
(a) Ionic dissociation
(b) Thermal decomposition
(c) Thermal dissociation
(d) Double decomposition.
Answer:
(c) Thermal dissociation

Question 5.
Reaction in which new compounds are formed by the exchange of ions of components between compounds are called :
(a) Substitution
(b) Decomposition
(c) Double decomposition
(d) Dissociation.
Answer:
(c) Double decomposition

Question 6.
The chemical formulae of Lead Nitrate is :
(a) Pb NO₃
(b) Pb (NO₃)₂
(c) Pb (NO)₂
(d) PbO
Answer:
(b) Pb (NO₃)₂

Question 7.
Which of the following is not a physical change?
(a) Evaporation of water into vapours
(b) Freezing of milk
(c) Rottening of fruits
(d) Both (b) and (c).
Answer:
(c) Rottening of fruits

Question 8.
Which is not true for a chemical change?
(a) No new substance is formed
(b) The change is temporary
(c) The identity of the original substance is lost
(d) None of the above.
Answer:
(c) The identity of the original substance is lost

Question 9.
The removal of oxygen from a substance is called :
(a) Oxidation
(b) Corrosion
(c) Reduction
(d) Rancidity.
Answer:
(a) Oxidation

Question 10.
In order to prevent the spoilage of potato chips, they are packed in plastic bags in an atmosphere of :
(a) N₂
(b) Cl₂
(c) H₂
(d) O₂
Answer:
(a) N₂

Question 11.
The chemical reaction involved in the corrosion of iron metal is that of:
(a) Oxidation as well as displacement
(b) Oxidation as well as a combination
(c) Reduction as well as combination
(d) Reduction as well as displacement.
Answer:
(a) Oxidation as well as displacement

Question 12.
Consider the reaction :
KBr (aq) + AgNO₃ (aq) → KNO₃ (aq) + AgBr (s)
This is an example of :
(a) Decomposition reaction
(b) Double displacement reaction.
(c) Combination reaction
(d) Displacement reaction.
Answer:
(b) Double displacement reaction.

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