II A (alkaline earth metals) and II B (zinc family) resemble :

M g S O_{4} .7 H_{2} O

is isomorphous with

Z n S O_{4} . 7 H_{2} O

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II A and II B cations are not precipitated by

H_{2} S

in acidic medium

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both (a) and (b)

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None of the above

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Solution

The correct option is D both (a) and (b)
$M g S O_{4} . 7 H_{2} O$ is is Amorphous with $Z n S O_{4} 7 H_{2} O$ as they both have same lattice.
Zn cations precipitates by $H_{2} S$ in presence of $N H_{4} C l + N H_{4} O H$ .

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