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Question

Hydrogen gas is not obtained when zinc reacts with:


A

Cold water

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B

Hot NaOH solution

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C

Conc. H2SO4

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D

Dil. HCl

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Solution

The correct options are
A

Cold water


C

Conc. H2SO4


Zinc does not react with cold water to produce hydrogen and it produces hydrogen gas by reacting with steam.

When zinc reacts with concentrated sulphuric acid then,

Zn(s) + conc. 2H2SO4(l)ZnSO4(aq) + SO2 +2H2O(l)

Instead of hydrogen, zinc reacts with concentrated sulphuric acid to produce zinc sulphate, sulphur dioxide gas and water. Moreover, sulphur dioxide gas has the property to convert lime water milky.


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