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Q.

How many grams of 40% pure sodium hydroxide is dissolved in 0.5 M, 250 ml NaOH solution?

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a

2 gm

b

12.5 gm

c

4 gm

d

5 gm

answer is C.

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Detailed Solution

 Moles of pure NaOH=0.5×0.25=0.125

 weight =5gm100gm impure =40gm pure 

? ⇐5gm=12.5gm

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