A) \[7\frac{1}{7}%\]
B) \[7\frac{1}{9}%\]
C) \[9\frac{1}{7}%\]
D) \[7\frac{1}{3}%\]
Correct Answer: C
Solution :
(c): % age means \[\frac{\text{weight}}{\text{volume}}%\text{ }age\Rightarrow \] in 100 ml, Salt being non-volatile, will not evaporate In 81, we have \[8000ml\Rightarrow \frac{8}{100}\times 8000\]gm salt = 640 gm salt. After evaporation 7L solution is left with same 640 gm salt \[=\frac{W}{V}%=\frac{640\,gm}{7000\,mL}\times 100%=9\frac{1}{7}%\].You need to login to perform this action.
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