Which property of the Group II elements (magnesium to barium) and their compounds increases with an increasing proton (atomic) number?
Correct answer: D. The stability of the carbonate to heat
- A. The magnitude of the enthalpy change of hydration of the metal ion
- B. The pH of the aqueous chloride
- C. The solubility of the sulphate in water
- D. The stability of the carbonate to heat
- E. The tendency to form complex ions
Explanation
The stability of metal carbonates increases down the group, so D is the correct option. Down the group enthalpy change of hydration of metal ion, pH of the aqueous chloride, solubility of sulphate, and tendency to form complex ions decreases so options A, B, C, and E are wrong.
This question appeared on the NUMS 2016 paper, which you can sit online with every answer explained.
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About Reactions of Group II Elements
Group II reactions cover the behaviour of beryllium, magnesium, calcium, strontium and barium with water, oxygen, halogens, acids and nitrogen. The trends in reactivity, hydroxide solubility and basicity, along with the thermal decomposition of carbonates and nitrates, depend on increasing atomic size down the group.
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