Question

Which is the incorrect statement among the following?

• A. The oxide that forms acid when combined with water, is acidic oxide.
• B. The oxides showing acidic as well as basic characteristics are amphoteric oxides.
• C. The acidic character of oxides increases, whereas basic character decreases in a period from left to right in the periodic table.
• D. \(\text{NO}\), \(\text{N}_{2}\text{O}\) and \(\text{CO}\) are amphoteric oxides.

Hint:

NO, N2O and CO are neutral oxides, not amphoteric oxides.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept
Acidic oxides form acids with water, amphoteric oxides show both acidic and basic behaviour, and neutral oxides show neither.

Step 2: Check statements A to C
(A) is the correct definition of an acidic oxide.
(B) is the correct definition of amphoteric oxides.
(C) is true because non-metallic character increases across a period, so acidic character of oxides increases.

Step 3: Check statement D
\(\text{NO}\), \(\text{N}_{2}\text{O}\) and \(\text{CO}\) do not react with acids or bases, so they are neutral oxides, not amphoteric.

Step 4: Result
Statement (D) is incorrect.

Final Answer:
Statement D is incorrect because those three are neutral oxides. \[ \boxed{\text{(D) }\text{NO, N}_{2}\text{O and CO are amphoteric oxides.}} \]