Hydrogen is prepared in the laboratory by the reaction between _____ and _____ sulphuric acid and is collected by _____ displacement of water.

Explanation

To answer the question, we need to fill in the blanks regarding the preparation of hydrogen in the laboratory.

### Step-by-Step Solution:

1. **Identify the Reactants**:
- In the laboratory, hydrogen gas is prepared by the reaction of **zinc** with **dilute sulfuric acid**.
- Therefore, the first two blanks are filled with "zinc" and "dilute sulfuric acid".

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