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 Caco, 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:

Option D is correct

Hope u understand

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Answer 2

Answer:

Option D

Hope u understand