Question

Assertion : Number of atoms of He in 60 u of He is 15.

Reason : Atomic weight of He is 4 u.

Options :-

a) If both Assertion & Reason are true & the Reason is the correct explanation for the Assertion.

b) If both Assertion & Reason are true but Reason is not a correct explanation for the Assertion.

c) If Assertion is true but the Reason is false.

d) If both Assertion and Reason are false.​

Answer 1

Answer:

option c

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Answer 2

Number of atoms of He in 60 u of He is 15. Atomic weight of He is 4 u. Both assertion and reason are true and the reason is the correct explanation for the assertion. Thus, the correct option is (a).

Explanation:

• The atomic weight of Helium is 4 u.
• This means the atomic weight of one atom of Helium is 4 u.
• Therefore, 60 u will be the atomic weight of $\[{\text{60}}\,{\text{u/4}}\,{\text{u = 15}}\]$ atoms of Helium.
• It means the number of atoms of He in 60 u of He is 15.
• Thus, both assertion and reason are true and the reason is the correct explanation for the assertion.