Question

42. Assertion - Helium has 2 valence electrons and its valency is 0.
Reason - Helium is the most abundant element in universe.
a) Both A and Rare true and R is correct explanation of the assertion
b) Both A and Rare true and R is not the correct explanation of the assertion
C) A is true, but R is false
d) A is false, but Ris true / false​

Answer 1

Explanation:

Given -

• Assertion and Reason

To Find :-

• Which Option is correct ?

For checking which option is correct, we need to solve both Assertion and Reason.

At first,

Assertion :-

Helium has 2 valence electrons and its valency is 0.

Assertion is correct because He has 2 valence electrons and it's Valency is 0.

Now,

Reason :-

Helium is the most abundant element in universe.

Reason is incorrect because H is most abundant element not He.

Hence,

Assertion is correct and Reason is wrong

Therefore,

Option C is correct.

Answer 2

Answer:

C) Assertion is true but Reason is false