MCQ
Coinage metals are present in
- A$s-$ block
- ✓$d-$ block
- C$p-$ block
- D$f-$ block
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$\mathrm{A}_{2}(\mathrm{g})+\mathrm{B}_{2}(\mathrm{g}) \rightleftharpoons \mathrm{X}_{2}(\mathrm{g}) \Delta_{r} \mathrm{H}=-\mathrm{X} \mathrm{kJ} ?$