s-Block ElementsHard
Question
A metal M readily forms water soluble sulphate MSO4, water insoluble hydroxide M(OH)2 and oxide MO. The oxide and hydroxide are soluble in NaOH. The M is :
Options
A.Be
B.Mg
C.Ca
D.Sr
Solution
For alkaline earth metals,
(a) solubility of sulphates decreases down the group.
(b) solubility of hydroxide increases down the group.
BeO and Be(OH)2 are amphoteric; so they are soluble in NaOH forming soluble [Be(OH)4]2-.
Hence metal M is Be.
(a) solubility of sulphates decreases down the group.
(b) solubility of hydroxide increases down the group.
BeO and Be(OH)2 are amphoteric; so they are soluble in NaOH forming soluble [Be(OH)4]2-.
Hence metal M is Be.
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