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Uses of Metals

Hydrogen gas ...

Question

Hydrogen gas is evolved when copper turnings are added to the sulphuric acid.

A

True

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B

False

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Solution

The correct option is B
False

Hydrogen has higher reactivity than copper and thus cannot it replace hydrogen from the acid.

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Similar questions

Hydrogen gas is evolved when Copper turnings are added to sulphuric acid.

Q. When copper is reacted with conc. sulphuric acid, which gas is evolved?

H_{2}

gas is evolved when iron is added to dil.

H_{2} {SO}_{4}

and not when copper is added to dil.

H_{2} {SO}_{4}

.

Q. When concentrated sulphuric acid was added to an unknown salt present in a test tube a brown gas(A) was evolved. This gas intensified when copper turnings were added to this test tube. On cooling, the gas(A) changes into a colourless solid(B).
Why does gas(A) change to solid on cooling?

Q. When concentrated sulphuric acid was added to an unknown salt present in a test tube a brown gas(A) was evolved. This gas intensified when copper turning were added to this test tube. On cooling, the gas(A) changed into a colourless solid(B).
Identify (A) and (B).

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