If 4 litres of water is evaporated on boiling from 12 litres of salt solution co

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Question

If 4 litres of water is evaporated on boiling from 12 litres of salt solution containing 7 percentage salt, the percentage of salt in the remaining solution is

Options:

A . 13%

B . 10.5%

C . 11.5%

D . 12%

Answer: Option B
Answer: (b)In 12 litres salt solution, Salt = ${7 × 12}/100 = 0.84$ unitsWater = ${93 × 12}/100 = 11.16$ units After evaporation, Percentage of salt = $0.84/8 × 100 = 10.5$%

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