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

Students can practice the NCERT MCQ Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations with Answers Pdf free download is available here. Revise all the concepts easily by taking help from the MCQ Questions for Class 10 Science with Answers are prepared based on the latest exam pattern. Students can refer to these Chemical Reactions and Equations Class 10 MCQs Questions with Answers and assess their preparation level.

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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