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Byju's Answer

Standard XII

Chemistry

Introduction to Oxidation and Reduction

Consider the ...

Question

Consider the following statements and arrange in the order of true/false as given in the codes (T/F) :
$S_{1}$ : $S r^{2 +}$ ions in very dilute solution do not give yellow precipitate with $C r O_{4}^{2 -}$ ions.
$S_{2}$ : $C a^{2 +}$ ions give a yellow precipitate in presence of ammonia with potassium ferrocyanide solution.
$S_{3}$ : $M g^{2 +}$ ions in solution gives a gelatinous white precipitate of magnesium hydroxide with ammonia solution and the precipitate is readily soluble in solution and aqua regia.
$S_{4}$ : $H g S$ forms soluble complex in excess of sulphide.

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Solution

The correct option is C TFTT
In very dilute solutions, the ionic product of strontium chromate will be lower than the solubility product. Hence, the precipitate will not occur.Hence, statement 1 is true.
When calcium ions react with potassium ferrocyanide solution in presence of ammonia, yellow precipitate is not obtained. Instead, white precipitate of $K (N H_{4}) C a (F a (C N)_{6}]$ is obtained. Hence, statement 2 is false.
Magnesium ions react with ammonia to form gelatinous white precipitate of magnesium hydroxide . It is readily soluble in solution and aqua regia. $M g^{2 +} + 2 N H_{3} + 2 H_{2} O ⇌ M g (O H)_{2} ↓ + 2 N H_{4}^{-}$ . Hence, statement 3 is true.

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Similar questions

Q. Consider the following statements and arrange in the order of true/false as given in the codes.

S_{1}

: Like

C O_{3}^{- 2}, S O_{3}^{2 -}

ion also gives test with baryta water,

B a (O H)_{2}

S_{2}

A g_{2} S O_{3}

is insolube in dilute

H N O_{3}

S_{3}

: Triodide ions

(I_{3}^{2 -})

produced by the reaction of

C u^{2 +}

and KI solution are not reduced by excess of sodium thiosulphate solution.

S_{4}

: Black precipitate of

C u (S C N)_{2}

turns into white precipitate, when it reacts with saturated solution of

S O_{2}

in water.

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

Q. Which of the following ions in solution would form a white precipitate that is soluble in excess sodium hydroxide solution is added to it ?

Q. The aqueous solution of an inorganic compound (X) gives white precipitate with

N H_{4} O H

which does not dissolve in excess of

N H_{4} O H

This aqueous solution also gives white precipitate with

A g N O_{3}

and the precipitate is soluble in dilute

H N O_{3}

. Here, (X) is :

Q. Consider the following statements and arrange in the order of true/false as given in the codes.

S_{1} : 2 S e_{2} C l_{2} \to S e C l_{4} + 3 S e

S_{2}

: Dioxides like

M n O_{2}, P b O_{2}

do not form

H_{2} O_{2}

with dilute acids but they evolve

O_{2}

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H_{2} S O_{4}

S_{3}

: Sodium thiosulphate with

F e C l_{3}

solution develops a pink or violet colour which soon vanishes.

S_{4}

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P b S_{2} O_{3}

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