Question

which metal gives hydrogen on reacting with water , acid and alkali ?
a) Iron
b) Zinc
c) Magnesium
d) Lead
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Answer 1

Answer:

b) Zinc

Explanation:

Zinc is an amphoteric oxide which means it reacts with both acids and bases to liberate hydrogen as well as water to liberate hydrogen

Answer 2

Zinc reacts with both acid and alkali to produce hydrogen gas and other products as per the reactant used.

• Zinc is an amphoteric metal.
• An amphoteric metal is one which reacts with both acids and alkalis.
• Zinc dissolves in both acids as well as alkalis.
• Zinc on reaction with hydrochloric acid produces hydrogen gas and zinc chloride.
• Zinc on reacting with sodium hydoxide(caustic soda) produce hydrogen gas and sodium zincate as the products.