Question

Which of the following statement(s) is (are) incorrect for alkali metals?

• A. Li$^+$ is exceptionally small and shows covalent character in some compounds
• B. Sodium oxide is isomorphic in nature
• C. Lithium is strongest reducing agent
• D. All alkali metals give blue coloration in liquid ammonia

Hint:

Check periodic trend and special Li behaviour first.

Answer 1

The Correct Option is B

Step 1: Statement checks: - (A) true due to high polarizing power. - (C) true: high hydration energy. - (D) true: ammoniated electron.
Step 2: (B) isomorphic word misused; Na$_2$O is amphoteric not isomorphic → wrong. Hence → (B).