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A solution containing a group-IV cation gives a precipitate on passing H2S. A solution of this precipitate in dilute HCl produces a white precipitate with basic NaOH solution and bluish white precipitate with basic potassium ferrocyanide. The cation is:

A

Ni2+

B

Co2+

C

Mn2+

D

Zn2+

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In qualitative analysis of cations, the group reagent NH₄Cl and aqueous NH₃ will

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