An inorganic compound A shows the following reactionsi It is white solid exists as dimmer and gives fumes of B with wet airii It sublimes in 180- C and form monomer If heated to 400- Ciii Its aq solution turns blue litmus to red-iv Addition of NH 4 OH and NaOH separately to a solution of A gives white pptwhich is however soluble in excess of NaOH- What is -A-A- Al 2 Cl 6B- NH 4 OHC- Al OH 3D- NaOH

The correct option is A Al2Cl6 'A' is the white solid existing as dimmer ⇒ A may be AlCl_3 existing as Al_2Cl_6 (White) i) When Al_2Cl_6 is exposed to moist ai ...

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Byju's Answer

Standard IX

Chemistry

Potassium Dichromate

An inorganic ...

Question

An inorganic compound (A) shows the following reactions

i) It is white solid exists as dimmer and gives fumes of (B) with wet air

ii) It sublimes in $180^{\circ} C$ and form monomer If heated to $400^{\circ} C$

iii) Its aq solution turns blue litmus to red.

iv) Addition of $N H_{4} O H$ and NaOH separately to a solution of (A) gives white ppt

which is however soluble in excess of NaOH. What is 'A'

Al₂Cl₆

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NH₄OH

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Al (OH)₃

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NaOH

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Solution

The correct option is A
Al₂Cl₆

'A' is the white solid existing as dimmer

$\Rightarrow$ A may be $A l C l_{3}$ existing as $A l_{2} C l_{6}$ (White)

i) When $A l_{2} C l_{6}$ is exposed to moist air

$A l_{2} C l_{6} + 6 H_{2} O \to 2 A I (O H)_{3} + 6 H C l$

(fumes of HCl and colloidal $A l (O H)_{3}$

ii) when (A) is heated to $180^{\circ} C$ it sublimes to give

$A l_{2} C l_{6} 180^{\circ} C - -- \to A l_{2} C l_{6} (g)$ and when heated to $400^{\circ} C$ it gives monomer

$A l_{2} C l_{6} 400^{\circ} C - -- \to 2 A l C l_{3}$

iii) When heated with NH_4OH and NaOH separately give

$A l_{2} C l_{6} + 6 N H_{4} O H \to 2 A l (O H)_{3} ↓ 6 N H_{4} C l$

(whiteppt)

and $A l_{2} C l_{6} + 6 N a O H \to 2 A l (O H)_{3} ↓ 6 N a C l$

(whiteppt)

again $A l (O H)_{3} + N a O H \to N a A l O_{2} + 2 H_{2} O$

(excess)(Soluble)

Suggest Corrections

Similar questions

Q. An inorganic compound

A

shows the following reaction:
(i) It is white solid, exists as dimer and fumes in the wet air.
(ii)It sublimes at

180^{\circ} C

and forms monomer if heated to

400^{\circ} C

.
(iii) Its aqueous solution turns blue litmus to red and gives a white precipitate with

A g N O_{3}

solution, which is soluble in

N H_{4} O H

.
Addition of

N H_{4} O H

and NaOH separately to the solution of

A

gives a gelatinous precipitate which in however soluble in excess of

N a O H

.
The compound

A

is:

Q. A colourless mixture of two substances (A) and (B) (excess) is soluble in

H_{2} O

, separately. (A) turns blue litmus red and (B) turns red litmus blue. (A) gives white ppt. with (B), which dissolves in excess of (B) forming (C). (A) when placed in moist air gives fumes and can form dimer. (A) gives white ppt. with

{N H}_{4} C l

and

{N H}_{4} O H

soluble in (B). (A) also gives white precipitate with

{A g N O}_{3}

soluble in

{N H}_{4} O H

Thus, A turns blue litmus red. It is due to acidic solution because of ________.

A colourless mixture of two substances (A) and (B) (excess) is soluble in

H_{2} O

{N H}_{4} C l

and

{N H}_{4} O H

soluble in (B). (A) also gives white precipitate with

{A g N O}_{3}

soluble in

{N H}_{4} O H

Thus, white fumes are formed in moist air. It is due to formation of ___________.

Q. Identify the inorganic salt

A

whose aqueous solution gives following reactions.
(i) pale yellow precipitate with

A g N O_{3}

solution, insoluble in dil

H N O_{3}

(ii) white precipitate with

N H_{4} O H

and also with

N a O H

solution. However the precipitate does not dissolve in excess of

N H_{4} O H

but soluble in excess of

N a O H

An inorganic compound (A) is a strong reducing agent. Its hydrolysis in water gives a white turbidity (B). Aqueous solution of (A) gives a white precipitate (C) with NaOH solution which is soluble in excess of NaOH. (A) reduces auric chloride to produce purple of cassius. (A) also reduces iodine and gives chromyl chloride test. What is 'B' in the chemical reactions.

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