A substance X is a building material and is inosoluble in water. When reactd with dilute HCl, it produces a gas which turns lime water milky, Predict the substance. Write the chemical equations involved.

Explanation

To solve the problem, let's break it down step by step.

### Step 1: Identify the Substance
The problem states that substance X is a building material that is insoluble in water and reacts with dilute hydrochloric acid (HCl) to produce a gas that turns lime water milky.

**Hint:** Think about common building materials that are known to be insoluble in water and can react with acids.

### Step 2: Determine the Reaction
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