First slide

13th group or boron group

Question

Which of the following is pseudo alum?

Moderate

A

${({NH}_{4})}_{2} {SO}_{4} \cdot {Fe}_{2} {({SO}_{4})}_{3} \cdot 24 H_{2} O$
B

$K_{2} {SO}_{4} \cdot {Al}_{2} {({SO}_{4})}_{3} \cdot 24 H_{2} O$
C

${MnSO}_{4} \cdot {Al}_{2} {({SO}_{4})}_{3} \cdot 24 H_{2} O$
D

None of these

Solution

A pseudo alum is a double sulfate of the typical formula ASO₄B₂(SO₄)₃24H₂O,
where A is a divalent metal ion, such as cobalt , manganese , magnesium or iron , and B is a trivalent metal ion. i.e. class of alums in which the usual mono valent metal of a true alum is replaced by a bivalent metal.
so MnSO₄⋅Al₂(SO₄)₃⋅24H₂O is pseudo alum

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