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A certain weight of sodium Iodine and so...

A certain weight of sodium Iodine and sodium chloride mixture when treated with sulphuric acid was found to give the same weight (as that of mixture) of sodium sulphate. The percentage composition of NaCl is

A

`18.86`

B

`52.23`

C

`35.57`

D

`71.14`

Text Solution

Verified by Experts

The correct Answer is:
D
`2NaCl+H_(2)SO_(4)rarrNa_(2)SO_(4)+2HCl`
`2NaI+H_(2)SO_(4)rarrNa_(2)SO_(4)+2HI`
Let the wt of the mixture = 1 g
`{:(2xx58.5g NaCl" gives",142g Na_(2)SO_(4)),(xg NaCl" gives",142 xg Na_(2)SO_(4)),(,117):}`
300 g of NaI gives 142g `Na_(2)SO_(4)`
(1-x)g of NaI gives `((1-x)xx142)/(300)gNa_(2)SO_(4)`
`(142x)/(117)+((1-x)xx142)/(300)=1impliesx=0.7114g`
% of `NaCl=(0.7114)/(1)xx100=71.14`
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