42. Assertion - Helium has 2 valence electrons and its valency is 0.Re

1.	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 assertionb) Both A and Rare true and R is not the correct explanation of the assertionC) A is true, but R is falsed) A is false, but Ris true / false
Answer» 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.

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 assertionb) Both A and Rare true and R is not the correct explanation of the assertionC) A is true, but R is falsed) A is false, but Ris true / false

Answer»

Explanation:

GIVEN -

To Find :-

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.

Assertion is correct and Reason is wrong

Therefore,

Option C is correct.