Solutions Question 210

Question: When $ 7.1gm,Na_2SO_4 $ (molecular mass 142) dissolves in $ 100,ml,H_2O $ , the molarity of the solution is [CBSE PMT 1991; MP PET 1993, 95]

Options:

A) 2.0 M

B) 1.0 M

C) 0.5 M

D) 0.05 M

Show Answer

Answer:

Correct Answer: C

Solution:

Molarity $ =\frac{w\times 1000}{ml\text{ wt}\text{. }\times \text{Volume }ml.} $ = $ \frac{7.1\times 1000}{142\times 100}=0.5,M $ .



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