A) 0.1
B) 0.5
C) 1.0
D) 2.0
Correct Answer: B
Solution :
Key Idea Molarity \[(M)=\frac{\frac{wt.\text{ }of\text{ }solute}{molecular\text{ }wt.\text{ }of\text{ }solute}}{volume\text{ }of\text{ }solution\text{ }m\text{ }litres}\] Weight of solute = 5 g Molecular weight of \[NaOH=40\] Volume = 250 mL \[=\frac{250}{1000}L\] Molarity \[=\frac{\frac{5}{40}}{\frac{250}{1000}}\] Molarity = 0.5 M
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