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15 mL O(2) and 35mL H(2) are taken in a ...

15 `mL_` `O_(2)` and `35mL_` `H_(2)` are taken in a tube and electric arc is produced a gas is left behind. It is

A

`H_(2)`

B

a mixture of `H_(2) and O_(2)`

C

`O_(2)`

D

air

Text Solution

Verified by Experts

The correct Answer is:
A
`underset(35)(2H_(2))+underset(15)(O_(2))to2H_(2)O`
`because`1 part `O_(2)` reacts with 2 part `H_(2)`
`therefore`15 part `O_(2)` reacts with`=2xx15=30` parts
`therefore`Residual `H_(2)=35-30=5` parts.
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