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Which of the following compounds is used in the preparation of hydrogen gas? (20

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Question: Which of the following compounds is used in the preparation of hydrogen gas? (2022)

Options:

  1. NaOH
  2. CaO
  3. MgCl2
  4. Zn + HCl

Correct Answer: Zn + HCl

Exam Year: 2022

Solution: 

Zinc reacts with hydrochloric acid (HCl) to produce hydrogen gas.

Which of the following compounds is used in the preparation of hydrogen gas? (20

Practice Questions

Q1
Which of the following compounds is used in the preparation of hydrogen gas? (2022)
  1. NaOH
  2. CaO
  3. MgCl2
  4. Zn + HCl

Questions & Step-by-Step Solutions

Which of the following compounds is used in the preparation of hydrogen gas? (2022)
  • Step 1: Identify the compounds involved in the reaction. In this case, we have zinc (Zn) and hydrochloric acid (HCl).
  • Step 2: Understand that zinc is a metal and hydrochloric acid is an acid.
  • Step 3: Know that when zinc reacts with hydrochloric acid, a chemical reaction occurs.
  • Step 4: The reaction produces hydrogen gas (H2) as one of the products.
  • Step 5: Conclude that zinc and hydrochloric acid are used to prepare hydrogen gas.
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