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Question
Mohan has three solutions P, Q and R having a pH of 13, 5 and 2 respectively. Which of the above solutions P, Q or R will react with magnesium to liberate hydrogen gas?
Short/Brief Note
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Solution
Highly acidic with pH-2, 'R' interacts with metal to create salt and release H2 gas.
\[\ce{Mg + R -> Salt of acid + H2}\]
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