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4g of mixture of Na(2)CO(3) and NaHCO(3)...

4g of mixture of `Na_(2)CO_(3)` and `NaHCO_(3)` on heating liberates 448 ml of `CO_(2)` at STP. The percentage of `Na_(2)CO_(3)` in the mixture is

A

84

B

16

C

54

D

80

Text Solution

Verified by Experts

The correct Answer is:
B
`Na_(2)CO_(3)` is stable to heat
`underset(3.36g)underset(2xx84g)(2NaHCO_(3))overset(Delta)rarrNa_(2)CO_(3)+H_(2)O+underset(448 ml)underset(22400 ml)(CO_(2)uarr)`
wtof `Na_(2)CO_(3)=4-3.36=0.64g`
% of `N_(2)CO_(3)=(0.64)/(4)xx100=(64)/(4)=16`
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