Q.

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

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a

0.75L of 4 N HCl and 0.25L of 10 N HCl

b

0.25L of 4 N HCl and 0.75L of 10 N HCl

c

0.67L of 4 N HCl and 0.33L of 10 N HCl

d

0.80L of 4 N HCl and 0.20L of 10 N HCl

answer is C.

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Detailed Solution

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solutions mixed are 4N HCl and 10N HCl to form 1l of 6N HCl

Total volume of 6N solution = 1lit

4N HCl sol.            10N HCl sol.

V1= v l                      V2= (1-v) l

N1= 4                        N2=10

 Resultantnormality ,N=V1N1+V2N2V1+V2

6=v(4)+(1-v)101

 6= 4v+10-10v

 6v=4

V=23L=0.67L

 V1=0.67    V2= 1-0.67 = 0.33 L

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