A) calcium
- Calcium reacts with cold water to form calcium hydroxide along with evolution of hydrogen gas.
- When calcium reacts with water, it forms calcium hydroxide and hydrogen gas. Due to the formation of hydrogen bubbles that stick to the surface of calcium, it starts floating on water.
Note:
Metals like aluminum, iron and zinc do not react either with cold or hot water. But they react with steam to form the metal oxide and hydrogen. Metals such as lead, copper, silver and gold do not react with water at all.
Thus, correct option is A.
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