Question

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Answer 1

Answer:

Calcium reacts slowly with water. The reaction forms calcium hydroxide, Ca(OH)2and hydrogen gas (H2). The calcium metal sinks in water and after an hour or so bubbles of hydrogen are evident, stuck to the surface of the metal.

Magnesium and manganese react with very dilute nitric acid to liberate hydrogen gas.

Answer 2

Answer:

a.) The gas evolved is H2.

When calcium reacts with water the heat is not sufficient to catch fire

b.) Nitric acid is a strong oxidising agent .But it oxidides the hydrogen gas to for H2O(water).

Explanation:

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