RBSE Praveshika Science Practice Questions - Rajasthan RBSE Praveshika Science - Code 007 Exam

Which observation best indicates that a chemical reaction has taken place when zinc is added to dilute sulphuric acid?

The zinc pieces simply change shape without gas. Bubbles of a colourless gas form and the metal slowly disappears. The solution freezes solid at room temperature. Zinc becomes magnetic immediately.

Correct Answer:

Bubbles of a colourless gas form and the metal slowly disappears.

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