Question

The following questions consists of two statements - Assertion (A) and Reason(R). Answer
these questions selecting appropriate option given below:

(a) Both A and R are true and R is correct explanation of A

(b) Both A and R are true and R is not correct explanation of A

(c) A is true but R is false

(d) A is false but R is true


1. Assertion (A)- Calcium Carbonate when heated gives calcium oxide and water
Reason (R) - on heating CaCO3 decomposition reaction takes place.

2. Assertion (A - White silver chloride turns grey in sunlight.
Reason (R) - Decomposition of silver chloride in presence of sunlight takes place to
form silver metal and chlorine gas.

3. Assertion (A)- Formation of curd is a chemical change
Reason (R) --The chemical composition of curd is different from the chemical
composition of milk.

4. Assertion (A)- zinc is less reactive than iron in the metal reactivity series.
Reason (R) -Zinc will oxidized first. Thus, as long as zinc is present, rusting of iron is
not possible.

5. Assertion (A)- All the combination reaction are exothermic.
Reason (R) during chemical reaction they release lot of energy.​

Answer 1

Answer:

A.a

B.a

C.r

D.a

Explanation: