NTA Abhyas NEET2020ChemistryGeneral Principles and Processes of Isolation of MetalsPractice
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?
Options
- A1 and 1
- B1 and 2
- C2 and 0.5
- D1 and 0.5
Correct answer
D. 1 and 0.5
Step-by-step solution
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 M O H 1 m o l e + H C l 1 m o l e → M C l + H 2 O 2 M O H 1 m o l e + H 2 S O 4 1 / 2 m o l e → 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.