Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Which of the following will have nearly equal \[{{H}^{+}}\]concentration? (1)\[100\text{ }mL\text{ }0.1\text{ }M\text{ }HCl\]mixed with 50 mL water (2)\[50\text{ }mL\text{ }0.1\text{ }M\text{ }{{H}_{2}}S{{O}_{4}}\]mixed with 100 mL water (3) \[50\text{ }mL\text{ }0.1\text{ }M\text{ }{{H}_{2}}S{{O}_{4}}\]mixed with 50 mL water (4)\[50\text{ }mL\text{ }0.1\text{ }M\text{ }HCl\]mixed with 50 mL waterA) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: B
Solution :
\[\because \] \[{{N}_{1}}{{V}_{1}}={{N}_{2}}{{V}_{2}}\] When\[100\text{ }mL\text{ }0.1\text{ }M\text{ }HCl\] mixed with 50 mL water then \[[{{H}^{+}}]=\frac{100\times 0.1}{150}=0.67\,M\] When\[50\text{ }mL\text{ }0.1\text{ }M\text{ }{{H}_{2}}S{{O}_{4}}\]mixed with 100 mL water then \[[{{H}^{+}}]=\frac{50\times 0.2}{150}=0.67\,M\]
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