To a small quantity of X, few drops of HCl are added. Consequently, a colourless, odourless gas is produced. This gas on passing through lime water turns it milky proving the presence of ______ in X.

Options

A. carbonate
B. bicarbonate
C. carbide
D. either (1) or (2)

Explanation

To solve the question, we need to identify the substance X based on the information provided. Let's break it down step by step.

### Step 1: Analyze the reaction
We are told that when a small quantity of X is treated with a few drops of HCl, a colorless and odorless gas is produced.

**Hint:** Consider the properties of gases that can be produced from reactions with acids.

### Step 2: Identify the gas
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