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Byju's Answer

Standard XII

Chemistry

Atomic Number and Mass Number

In group III,...

Question

In group III, the basic radicals are precipitated as their _____.

hydroxide

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carbonate

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sulphate

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All of the above

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Solution

The correct option is B hydroxide
Answer is 1.
In group III, the basic radicals are iron, aluminium and chromium and are precipitated as their hydroxides.

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Similar questions

State True or False.

First group basic radicals are precipitated as their chlorides.

Q. A solution containing a group-IV cation gives a precipitate on passing

H_{2} S

. A solution of this precipitate in

d i l . H C l

produces a white precipitate with basic

N a O H

solution and bluish-white precipitate with basic potassium ferrocyanide. The cation is:

Q. Assertion :For the analysis of

I I I^{r d}

group basic radicals,

N H_{4} C l

is added to suppress the ionisation of

N H_{4} O H

. Reason: With high concentration of

O H^{-}

ions, basic radicals of other groups also get precipitated with

I I I^{r d}

group basic radicals.

Q. Assertion :Statement-I :

N H_{4} C l

is added in

I I I

group basic radicals to suppress the ionisation of

N H_{4} O H

.
Reason: Statement-II: In the presence of a high concentration of

O H^{-}

ions, basic radicals of other groups will also get precipitated in

I I I

group.

Read the above assertion and reason and choose the correct option regarding it.

In qualitative analysis,

{I I I}^{r d}

group includes

F e^{3 +}, A l^{3 +}

and

C r^{3 +}

. The group reagent is ammonium hydroxide in the presence of ammonium chloride.

N H_{4} C I

is added to suppress the ionisation of

N H_{4} O H

so that only the

I I I^{r d}

group radicals are precipitated as their insoluble hydroxide and not the

I V^{t h}

and

V^{t h}

group radicals as the solubility products of their hydroxides are much higher. Before adding group reagent to the filtrate of IInd group, one drop of concentrated

H N O_{3}

(oxidising agent) is added and the content is boiled for 2-3 minutes and then cool because the solubility product of

F e (O H)_{2}

is very high as compared to

F e (O H)_{3}

. When a light bluish-green crystalline double salt-containing cations of III

^{r d}

group and zero groups are analysed. it responds to the following tests/reactions.
(a) Its aqueous solution gives a reddish-brown precipitate with an alkaline solution of potassium tetraiodomercurate (II)
(b) Its aqueous solution after boiling with conc.

H N O_{3}

gives a reddish-brown precipitate with sodium hydroxide.
(c) The solution of reddish-brown precipitate in oil.HCI gives blood red colouration with ammonium sulphocyanide and Prussian blue with potassium ferrocyanide.
(d) It's a very dilute solution gives a white precipitate with

(C H_{3} C O O)_{2} P b

solution and a white precipitate are only soluble in hot ammonium acetate.

Why one mL conc.

H N O_{3}

is added to

I I^{n d}

group filtrate before proceeding for

I I I^{r d}

group radicals?

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In group III, the basic radicals are precipitated as their _____.

The correct option is B hydroxideAnswer is 1.In group III, the basic radicals are iron, aluminium and chromium and are precipitated as their hydroxides.

The correct option is B hydroxide
Answer is 1.
In group III, the basic radicals are iron, aluminium and chromium and are precipitated as their hydroxides.