The first and second ionisation enthalpies of a metal are 496 and 4560 kJ mol- 1 , respectively. How many moles of HCl and H2SO4 , respectively, will be needed to react completely with 1 mole of the metal hydroxide?

Question

The first and second ionisation enthalpies of a metal are 496 and 4560 kJ mol- 1 , respectively. How many moles of HCl and H2SO4 , respectively, will be needed to react completely with 1 mole of the metal hydroxide? (A) 1 and 1 (B) 1 and 2 (C) 2 and 0.5 (D) 1 and 0.5

Tardigrade Admin · Accepted Answer

Metal: First ionization enthalpies = 496 kJ/mole
Second ionization enthalpies = 4560 kJ/mol
According to the given information of ionization enthalpies, metal belong to first group i.e. Monovalent cation

1 m o l e MO H + 1 m o l e H Cl \to MCl + H_{2} O

1 m o l e 2 MO H + 1/2 m o l e H_{2} S O_{4} \to M_{2} S O_{4} + H_{2} O

That is 1 mole HCl and 0.5 mole

H_{2} S O_{4}

are needed respectively.

Q. The first and second ionisation enthalpies of a metal are 496 and 4560 kJ mol−1 , respectively. How many moles of HCl and H2​SO4​ , respectively, will be needed to react completely with 1 mole of the metal hydroxide?

1 and 1

1 and 2

2 and 0.5

1 and 0.5

Q. The first and second ionisation enthalpies of a metal are 496 and 4560 kJ $m o l^{- 1}$ , respectively. How many moles of HCl and $H_{2} S O_{4}$ , respectively, will be needed to react completely with 1 mole of the metal hydroxide?