NCHMCT JEE 2012 Question Paper with solutions for online practice

Question : 3 of 200

Marks: +1, -0

What quantity of water should be added to 3 litres of 10% solution of salt, so that it becomes a 5% salt solution?

1.5 litres
2.7 litres
3 litres
None of these

Solution:

The given solution has 10% salt.
Water which is to be added has 0% salt concentration.
Final concentration of solution is 5%.
So, water should be added to the given solution in the ratio 5 : 5 = 1 : 1
∴ Quantity of water to be added
=

1/1

× 3 = 3 litres

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