Respiration is a biochemical process where glucose is broken down to release energy. Since sensible energy is released during the reaction, it is fundamentally classified as an exothermic reaction.
In this reaction, a single complex compound (Zinc Carbonate) breaks down thermally into two simpler substances (Zinc Oxide and Carbon dioxide), which explicitly characterizes a decomposition reaction.
Q. 168. When dilute hydrochloric acid is added to zinc pieces taken in a test tube:
(A) Pungent smelling gas is emitted
(B) The color of the solution becomes yellow
(C) No change takes place
(D) Small bubbles of hydrogen appear on the surface of zinc pieces.
Answer:
(D) Small bubbles of hydrogen appear on the surface of zinc pieces.
Explanation:
Zinc acts as an active metal and reacts with dilute hydrochloric acid () to form zinc chloride and displace hydrogen gas, visibly appearing as small effervescent bubbles on the metal surface.
Q. 169. Acids react with bases to form salt and water. This action is known as:
(A) Neutralization.
(B) Decomposition
(C) Combination
(D) Reduction
Answer:
(A) Neutralization
Explanation:
A neutralization reaction is a specific type of double displacement chemical reaction wherein an acid and a base react quantitatively with each other to neutralize their properties, forming water and a salt.
Q. 170. Pyridine is an example of:
(A) Aldehydes
(B) Ketones
(C) Heterocyclic.
(D) Alkenes
Answer:
(C) Heterocyclic
Explanation:
Pyridine () is an organic chemical compound whose basic ring structure contains atoms of at least two different elements (specifically carbon and nitrogen), accurately classifying it as a heterocyclic compound.
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