MCQ
Coinage metals are present in
- A$s-$ block
- ✓$d-$ block
- C$p-$ block
- D$f-$ block
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The correct order of their acidity is 

What is the standard free energy change for the reaction ${H_2}(g) + 2\,C\,(s) \to {C_2}{H_2}(g)$ .....$kJ$