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JEE Main 201510 AprilOnline

Exam: JEE Main
Year: 2015
Date: 10 April
Mode: Online
Subject: Chemistry
Chapter: p Block Elements (Group 15, 16, 17 & 18)

JEE Main 2015 · 10 April · Online · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

The cation that will not be precipitated by H _ 2 S in the presence...

The cation that will not be precipitated by

{H}_{2}S

in the presence of dil HCl is:

Options

A $C{o}^{2 +}$
B $A{s}^{3 +}$
C $P{b}^{2 +}$
D $C{u}^{2 +}$

Correct answer

A. $C{o}^{2 +}$

Step-by-step solution

C{o}^{2 +}

precipitated by

{H}_{2}S

in presence of

N{H}_{4}OH

in group IV as \cos (Black ppt.)

Other are precipitated as sulphide in presence of dil HCl in group II.

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