Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?

Explanation

To solve the question, we need to determine which acid does not produce hydrogen gas when reacting with metals (except manganese and magnesium). Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the general reaction of metals with acids
Metals typically react with acids to produce a salt and hydrogen gas. For example, when zinc reacts with hydrochloric acid, it produces zinc chloride and hydrogen gas.

### Step 2: Identify the acids in question
The question asks about specific acids, particularly nitric acid (HNO3), and how they behave when they react with metals.

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