The first and second ionisation enthalpies of a metal are 496 and 4560 kJ mol\(^{-1}\), respectively. How many moles of HCl and \(\mathrm{H_2SO_4}\), respectively, will be needed to react completely with 1 mole of the metal hydroxide ?
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- 1 and 2
- 1 and 0.5
- 1 and 1
- 2 and 0.5
The Correct Option is B
Solution and Explanation
Its hydroxide is MOH.
MOH + HCl \(\rightarrow\) MCl + \(\mathrm{H_2O}\): 1 mol MOH needs 1 mol HCl.
2MOH + \(\mathrm{H_2SO_4}\) \(\rightarrow\) \(\mathrm{M_2SO_4}\) + 2\(\mathrm{H_2O}\): 1 mol MOH needs 0.5 mol \(\mathrm{H_2SO_4}\).
Answer: (2) 1 and 0.5
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