JEE Mains · Chemistry · STD 12 - 2. Electrochemistry
The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is _______.
\(Ti ^{2+}, Cr ^{2+}\) and \(V ^{2+}\)
- A 2
- B 3
- C 1
- D 0
Answer & Solution
Correct Answer
(B) 3
Step-by-step Solution
Detailed explanation
The ions \(Ti ^{+2}, V^{+2}, Cr ^{+2}\) are strong reducing agents and will liberate hydrogen from a dilute acid, eg. \(2 Cr _{(\text {aq. })}^{+2}+2 H _{(\text {aq. })}^{+} \rightarrow 2 Cr _{(\text {aq. })}^{+3}+ H _2(g)\)
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