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The difference between the smell of $H_{2} S$ gas and $H_{2}$ gas is

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H_{2} S

gas has rotten smell

H_{2}

gas has no smell

Both 1 & 2

None of the above

answer is C.

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Detailed Solution

The difference between the smell of

H_{2} S

gas and

H_{2}

gas is

H_{2} S

gas has rotten smell and

H_{2}

gas has no smell.
Hydrogen gas and

H_{2} S

both are colourless gas. But they can be distinguished by their smell. Hydrogen gas is odourless but

H_{2} S

has a rotten egg smell. In household cylinders,

H_{2} S

is used as mercaptans to detect the leakage of the cylinder easily.

H_{2} S

gas is a colourless gas which has a rotten egg smell produced by bacteria.

H_{2} S

the gas is kept with a charcoal mixture to understand the flow of the gas.

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