Oxide of a metal on treatment with water produces a hissing sound and energy. The product (Y) formed on treatment with hydrochloric acid gives a solid X. Identify the oxide, the product (Y) and X. Also write all the balanced chemical equations and calculate molecular masses of the oxide, the product Y and X

Explanation

To solve the question step by step, we will identify the metal oxide, the product formed when it reacts with water, and the solid produced when this product reacts with hydrochloric acid. We will also write the balanced chemical equations and calculate the molecular masses of the substances involved.

### Step 1: Identify the Metal Oxide
The metal oxide that produces a hissing sound and energy when treated with water is **Calcium Oxide (CaO)**. This reaction is exothermic and produces calcium hydroxide.

**Hint:** Look for metal oxides that react vigorously with water.

### Step 2: Reaction of Calcium Oxide with Water
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