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Question

You are given a 15% solution of sulphuric acid and a 15% solution of HCN (hydrocyanic acid). Which solution has the higher concentration of H+ ions?

A
Solution of H2SO4
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B
Solution of HCN
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C
Both have equal concentration
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D
Cannot be determined
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Solution

The correct option is A Solution of H2SO4
Sulphuric acid is the stronger acid of the two as for each molecule of sulphuric acid it gives out two H+ ions in comparision to HCN (hydrocyanic acid) which gives only one. Also, pH of Sulphuric Acid is much lower than hydrocyanic acid, which justifies the fact that sulphuric acid is a highly strong acid as compared to hydrocyanic acid. Hence it will produce a higher concentration of H+ ions.

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