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Air sample from an industrial area of De...

Air sample from an industrial area of Delhi, which is heavily polluted by `CO_(2)`, was collected and analysed. One such sample of 224 L of air measured at STP was passed through a 500 " mL of " 0.1 M KOH solution, where `CO_(2)(g)` was absorbed completely. 50 " mL of " the above solution was then treated with excess of `BaCl_(2)` solution where all the carbonate was precipitated as `BaCO_(4)(s)`. The solution was filtered off and the filtrate required 30 " mL of " 0.1 M HCl solution for neutralisation.
Q. Calculate the weight of the precipitate of `BaCO_(3)(s)` obtained from 50 " mL of " the above test solution. `(Ba=137,C=12,O=16,Mw(BaCO_(3))=137+12+3xx16=197gmol^(-1))`

A

3.94 g

B

0.394 g

C

1.97 g

D

0.197 g

Text Solution

Verified by Experts

The correct Answer is:
C
`m" Eq of "CO_(2)=m" Eq of "CO_(3)^(2-)-=m" Eq of "BaCO_(3)=20`
Weight of `BaCO_(3)=20xx10^(-3)xx(197)/(2)=1.97g`
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