Question

Assertion (A): Sodium ion has valency one.
Reason (R): Sodium ion combines with one anion.

• A. Both A and R are true and R is the correct explanation of A
• B. A is true but R is false
• C. Both A and R are true but R is not the correct explanation of A
• D. Both A and R are false

Answer 1

The correct option is A Both A and R are true and R is the correct explanation of A

Sodium ion, ${Na}^{+}$, is a positively charged species which has +1 charge on it. It combines with one anion. Thus, its valency is 1.

Therefore, both A and R are true and R is the correct explanation of A.