12.5 mL of a solution containing 6 g of a dibasic acid in one litre was found to be neutralized by 10 mL of a decinormal solution of NaOH. The molecular mass of the acid is :

Options

A. 110
B. 75
C. 120
D. 150

Answer

D

Explanation

`N_(1)V_(1) ("acid")=N_(2)V_(2)("base")`
`N_(1)xx12.5=(1)/(10)xx10`
`N_(1)=(1)/(12.5)`
Strength `N=xx Ew`
`6 = (1)/(12.5)xx Ew`
Ew=75
Molar mass = Equivalent mass `xx` Basicity
`=75xx2=150`