Question

Assertion: The mass of Chlorine is 35.5 u

Reason: For elements having isotopes, the average of mass of its isotopes is considered as the atomic mass of that element.

• A. Only assertion is correct.
• B. Only reason is correct.
• C. Assertion and Reason both are correct and reason is the correct explanation of assertion.
• D. Assertion and Reason both are correct but reason is not the correct explanation for assertion.

Answer 1

The correct option is C

Assertion and Reason both are correct and reason is the correct explanation of assertion.

The average mass of all the isotopes of an element is considered as the atomic mass of that element as elements having isotopes occur in a mixture of their isotopes.

Chlorine has isotopes .Its atomic mass is 35.5u. The reason is explaining the assertion.