To a solution of a colourless efflorescent sodium salt, when dilute acid is added, a colourless gas is evolved along with formation of a white precipitate. Acidified dichromate solution turns green when the colourless gas is passed through it. The sodium salt is

N a_{2} S O_{3}

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N a_{2} S

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N a_{2} S_{2} O_{3}

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N a_{2} S_{4} O_{6}

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Solution

The correct option is C $N a_{2} S_{2} O_{3}$
$N a_{2} S_{2} O_{3} (a q) + 2 H C l (a q) \to S (s) White + S O_{2} (g) + H_{2} O (l) + 2 N a C l (a q)$

$3 S O_{2} (g) + N a_{2} C r_{2} O_{7} (g) + H_{2} S O_{4} (a q) \to C r_{2} (S O_{4})_{3} (a q) + K_{2} S O_{4} (a q) + H_{2} O (l)$

$N a_{2} S O_{3}$ and $N a_{2} S_{4} O_{6}$ both produces $S O_{2}$ on treatment with $H C l$ but does not give white precipitate of sulphur.

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Which of the following anion is present in compound A when warmed with dilute sulphuric acid gives a colourless gas which turns acidified potassium dichromate solution green.

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H_{2} S O_{4}

produces a colourless gas which turns lime water milky and an acidified orange coloured potassium dichromate solution green. The salt may be:

Q. Salts A, B, C, D and E undergo reactions (i) to (v) respectively. Identify the anion present in these salts on the basis of these reactions. Tabulate your answers in the format given below:
(i) When silver nitrate solution is added to a solution of A, a white precipitate, insoluble in dilute nitric acid, is formed.
(ii) Addition of dilute hydrochloric acid to B produces a gas which turns lead acetate paper black.
(iii) When a freshly prepared solution of ferrous sulphate is added to a solution of C and concentrated sulphuric acid is gently poured from the side of the test tube, a brown ring is formed.
(iv) When dilute sulphuric acid is added to D, a gas is produced which turns acidified potassium dichromate solution from orange to green.
(v) Addition of dilute hydrochloric acid to E produces an effervescence. The gas produced turns limewater milky but does not affect acidified potassium dichromate solution.

Salt	Anion
A
B
C
D
E

Q. A metal whose alloy finds use in the construction of aircrafts in the powdered form is added to sodium hydroxide solution. A colourless gas was evolved and after reaction was over, the solution was colourless.
(a) Name the powdered metal added to sodium hydroxide solution.
(b) Name the gas evolved.
(c) Name the salt present in the colourless solution.

Identify the anion present in the salt on the basis of the reaction given below

When dilute sulphuric acid is added to salt solution, a gas is produced which turns acidified potassium dichromate solution from orange to green.

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To a solution of a colourless efflorescent sodium salt, when dilute acid is added, a colourless gas is evolved along with formation of a white precipitate. Acidified dichromate solution turns green when the colourless gas is passed through it. The sodium salt is

The correct option is C Na2S2O3Na2S2O3(aq)+2HCl(aq)→S(s)White+SO2(g)+H2O(l)+2NaCl(aq) 3SO2(g)+Na2Cr2O7(g)+H2SO4(aq)→Cr2(SO4)3(aq)+K2SO4(aq)+H2O(l) Na2SO3 and Na2S4O6 both produces SO2 on treatment with HCl but does not give white precipitate of sulphur.