1.

The volume of 10 N and 4 N HCl required to make 1L of 6N HCl are :

Answer»

0.75 L of 10 N HCl and 0.25 L of 4 N HCl
0.80 L of 10 N HCl and 0.20 L of 4 N HCl
0.33 L of 10 N HCl and 0.67 L of 4 N HCl
0.5 L of 10 N HCl and 0.5 L of 4 N HCl.

Solution :LET volume of 10N needed `=x`
Volume of 4N HCl needed `=1-x`
Now `10xx x +4(1-x)=6xx1`
`10x+4-4x=6`
`6x=2 " or " x=2//6=0.33L`
Volume of 10N HCl `=0.33L`
Volume of 4N HCl `=1-0.33=0.67L`


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