Zinc can give hydrogen gas with both acid and sodium hydroxide. What kind of behaviour does this indicate?
Answer and explanation
Correct answer: Amphoteric behaviour
Amphoteric substances react with both acids and bases. Zinc reacts with a dilute acid to release hydrogen, for example, zinc plus hydrochloric acid forms zinc chloride and hydrogen. It also reacts with concentrated sodium hydroxide solution to form a soluble zincate compound and hydrogen. Thus the observation demonstrates amphoteric behaviour, not merely acidic, neutral, or oxidising behaviour. Option A is correct.
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What is the correct answer to this question?
Amphoteric behaviour
Why is this the correct answer?
Amphoteric substances react with both acids and bases. Zinc reacts with a dilute acid to release hydrogen, for example, zinc plus hydrochloric acid forms zinc chloride and hydrogen. It also reacts with concentrated sodium hydroxide solution to form a soluble zincate compound and hydrogen. Thus the observation demonstrates amphoteric behaviour, not merely acidic, neutral, or oxidising behaviour. Option A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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