A metal M does not liberate hydrogen from acids but reacts with oxygen Q 5 to give a black colour product. Identify M and black coloured produCt and also explain the reaction of M with oxygen. 

Explanation

To solve the question step by step, we will identify the metal (M) and the black-colored product formed when this metal reacts with oxygen. We will also explain the reaction of the metal with oxygen.

### Step 1: Understanding the Properties of Metal M
The question states that metal M does not liberate hydrogen from acids. This implies that metal M is less reactive than hydrogen. In the electrochemical series, metals that are positioned below hydrogen do not react with dilute acids to release hydrogen gas.

**Hint:** Look at the electrochemical series to identify metals that do not react with acids.

### Step 2: Identifying Metal M
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