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100 mLofa gas at STP was heated with Tin...

100 mLofa gas at STP was heated with Tin. Tin converted into stannous sulphide evolving hydrogen gas. This hydrogen when passed over hot Cuo, produced 0.081 g of water. If the vapour density of the gas is 17, find its formula.

A

`H _(2) S `

B

`SO _(2)`

C

`SO _(3)`

D

`NH _(3)`

Text Solution

Verified by Experts

The correct Answer is:
A
Tin is converted into sulphide and hydrogen is left, this gas contains H and S says `H _(a) S _(b)`
`H _(a) S _(b) + b Sn to b Sn S + (a)/(2) H _(2) overset( CuO ) to (a)/(2) H _(2) O`
The reaction suggests that
`because` Mole of `H _(2) :` mole of `H _(2) O` formed `::1 :1 ` and Mole of `H _(a) S _(b):` mole of `H _(2) :: 1 : a//2`
`therefore (100)/( 22400) = ( 0. 0 81)/(18) xx (2)/(a)`
`therefore a = 2`
`therefore` Molar mass of `H _(a) S _(b) = V. D. xx 2 = 2= 17 xx 2 = 34`
`1 xx a + 32 xx b = 34, 1 xx 2 + 32 xx b = 34 `
`b =1` Thus gas is `H _(2) S.`
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