Mixture of two metals having mass 2 gm (A = 15, B = 30) and are bivalent and dissolve in HCl and evolve 2.24 L `H_(2)` at STP . What is mass of A present in mixture ?

Options

A. 1 gm
B. 1.5 gm
C. 0.5 gm
D. 0.75 gm

Answer

A

Explanation

`A+2HCl to Acl_(2)+Hz`
mole `=(x)/(15)" "(x)/(15)`
`B+2HClto BCl_(2)+H2`
mole `=(2-x)/(30)" "(2-x)/(30)`
mole of `H_(2)=(x)/(15)+(2-x)/(30) =(2.24)/(22.4)=1/10`
`(x)/(15)-(x)/(30)=1/10-1/15x=1` gm