1.

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 ?

Answer»

1 gm
1.5 gm
0.5 gm
0.75 gm

SOLUTION :`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


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