Which of the following observations best shows that reduction has taken place in a chemical reaction?

Subject: General Awareness | Topic: Science | Difficulty: MEDIUM

Options

1. (A) Oxygen reacts with a metal to form a layer of oxide
2. (B) Carbon dioxide is released on heating a carbonate salt
3. (C) Oxygen is removed from a metallic oxide during heating
4. (D) Hydrogen gas is evolved after reaction of a metal with an acid

Verified Answer

Option (C): Oxygen is removed from a metallic oxide during heating

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