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CBSE Class 10 Science Question 21 of 45

Solved 2024 Sample Question Paper CBSE Class 10 Science — Question 1

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Question 21

Dil. HCl is added to Zn granules. How will you prove that chemical change has taken place here? Support your response with two arguments.

Answer

Two arguments in support of chemical change in this case are:

  1. Change in colour — Zinc metal displaces hydrogen gas and a new black coloured product zinc chloride is formed.
  2. Evolution of gas — Bubbles are seen which shows a gas (hydrogen gas) is released.