Copy and complete the following table: Compound Solubility in sodium Hydroxide Solubility in Ammonium Hydroxide Copper ( I I ) hydroxide Aluminium hydroxide Zinc hydroxide

Compound Solubility is sodium hydroxide Solubility in ammonium hydroxide Copper(II)hydroxide Insoluble Soluble Copper(II) hydroxide does not react with sodium hydroxide and form any salt hence it is insoluble in sodium hydroxide. But Copper(II) hydroxide reacts with ammonium hydroxide and forms a salt which is soluble. Compound Solubility is sodium hydroxide Solubility in ammonium hydroxide Aluminium hydroxide Soluble Insoluble Aluminium hydroxide is amphoteric in nature, it reacts with sodium hydroxide and forms a salt of sodium aluminate and water. Sodium aluminate is a soluble salt. It does not react with ammonium hydroxide hence remains insoluble. Compound Solubility is sodium hydroxide Solubility in ammonium hydroxide Zinc hydroxide Soluble Soluble When sodium hydroxide is added to zinc hydroxide, the precipitate of zinc hydroxide will dissolve, forming a colourless solution of zincate ion. Zinc hydroxide also dissolves in excess ammonium hydroxide to form a colourless, water-soluble ammine complex.

Read the following short write up and answer subsequent questions based. Compound A, B and C are respectively :

CrCl 3 : K 2 CrO 4 , K 2 Cr 2 O 7

CuCl 2 · 2 H 2 O ; CuCl 4 - 2 , K 2 CrO 4

MEDIUM

Earn 100

Write a chemical equation for the action of ammonium hydroxide on $Cr (III)$ ions.

Important Questions on Analytical Chemistry

HARD

Science>Chemistry>Analytical Chemistry>Action of Ammonium Hydroxide on Metallic Salt Solutions

The salt solution which does not react with ammonium hydroxide is:

MEDIUM

Science>Chemistry>Analytical Chemistry>Action of Ammonium Hydroxide on Metallic Salt Solutions

When

H_{2} O_{2}

is added to ice-cold solution of acidified potassium dichromate in ether and the contents are shaken and allowed to stand. What will happen next?

MEDIUM

Science>Chemistry>Analytical Chemistry>Action of Ammonium Hydroxide on Metallic Salt Solutions

The addition of an excess of ammonium chloride ammonia buffer to a solution containing nitrates of

Al, Bi, Mg

and

Zn

will precipitate hydroxides of

MEDIUM

Science>Chemistry>Analytical Chemistry>Action of Ammonium Hydroxide on Metallic Salt Solutions

In the precipitation of the iron group in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to

MEDIUM

Science>Chemistry>Analytical Chemistry>Action of Ammonium Hydroxide on Metallic Salt Solutions

A chloride which forms a precipitate that is soluble in excess of ammonium hydroxide, is

EASY

Science>Chemistry>Analytical Chemistry>Action of Ammonium Hydroxide on Metallic Salt Solutions

{Cr}_{2} {({SO}_{4})}_{3}

solution produces _____ colour with

{Na}_{2} O

(excess) and yellow colour with

{Na}_{2} O_{2}

(excess).

MEDIUM

Science>Chemistry>Analytical Chemistry>Action of Ammonium Hydroxide on Metallic Salt Solutions

_____ reagent can be used to distinguish a solution containing a lead salt from a solution containing zinc salt.

HARD

Science>Chemistry>Analytical Chemistry>Action of Ammonium Hydroxide on Metallic Salt Solutions

When hydrogen peroxide is added to acidified potassium dichromate, a blue colour is produced due to the formation of

HARD

Science>Chemistry>Analytical Chemistry>Action of Ammonium Hydroxide on Metallic Salt Solutions

In the given sequence, identify

X, Y

and

Z

EASY

Science>Chemistry>Analytical Chemistry>Action of Ammonium Hydroxide on Metallic Salt Solutions

A l^{3 +},

F e^{3 +},

Z n^{2 +}

and

N i^{2 +}

ions are present in an acidic solution. Excess of ammonium chloride solution is added followed by addition of ammonium hydroxide solution. The available precipitate will contain

EASY

Science>Chemistry>Analytical Chemistry>Action of Ammonium Hydroxide on Metallic Salt Solutions

The reagents