One gram of a mixture of `Na_(2)CO_(3)` and `NaHCO_(3)` consumes y gram equivalent of HCl for complete neutralization. One gram of the mixture is strongly heated, then cooled and the residue treated with HCl. The gram equivalent of HCl now required for complete neutralization will be

Options

A. 2 y
B. 3 y
C. y
D. y/2

Answer

C

Explanation

`2NaHCO_(3)overset(Delta)rarrNa_(2)CO_(3)+H_(2)O+CO_(2)`
`Na_(2)CO_(3)overset(Delta)rarr" No decomposition"`
As 1 g eq of `NaHCO_(3)` on heating produces 1 g eq of `Na_(2)CO_(3)`, number of gram equivalents of the mixture remains the same. Hence, number of gram equivalents of HCl consumed will also remain the same.