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Standard XII

Chemistry

Oxyacids of Phosphorus

An oxyacid of...

Question

An oxyacid of phosphorus has the following properties:

Complex neutralization of the acid with sodium hydroxide solution given an aqueous solution of sodium ions and oxy-acid anions in the ratio 2:1. When a solution of the acid is warmed with a silver nitrate solution, metallic silver is deposited.

What is the structure of the oxy-acid?

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Solution

The correct option is B 2
$H_{3} P O_{3} + 2 A g N O_{3} + H_{2} O \to H_{3} P O_{4} + 2 A g + 2 H N O_{3}$

$N a_{2} H P O_{3} \to 2 N a^{+} + H P O_{3}^{2 -}$ ---- so 2:1 ratio.

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Similar questions

Q. An oxyacid of phosphorus has the following properties: The complex neutralisation of the acid with sodium hydroxide solution given an aqueous solution of sodium ions and oxy-acid anions in the ratio 2:1. When a solution of the acid is warmed with silver nitrate solution, metallic silver is deposited.

p H

0.01 M solution of the sodium salt of this acid formed (assume

p K_{a_{1}} = 2 x

) is___________.

What do you observe when

(a) dilute sulphuric acid is added to granulated zinc ?

(b) a few pieces of iron are dropped in a blute solution of sodium chloride ?

(d) ferrous sulphate solution is added to an aqueous solution of sodium hydroxide.

(e) solid lead nitrate is heated ?

(f) when dilute sulphuric acid is added to barium chloride solution ?

Q. Write balanced chemical equations for each of the following reactions
1. Carbon dioxide Marble dissolves in hydrochloric acid to give calcium chloride water and carbon dioxide
2. Silver nitrate reacts with copper to produce copper nitrate and silver metal
3. Carbon dioxide gas is passed over lime water to form a precipitate of calcium carbonate
4. Aluminium Sulphate acts with Sodium Hydroxide to form precipitate of aluminium hydroxide and the solution of sodium sulphate
5. Barium Chloride solution reacts with sulphuric acid to form precipitate of Barium sulphate and solution of hydrochloric acid.

Q. Given below are word equations. Convert them into chemical equations using symbols and valencies. Balance the equations. Use appropriate signs for gases and precipitates in the reaction.
i) Zinc Sulphide

+

Oxygen gas

\to

Zinc oxide solid

+

Sulphur dioxide gas
ii) Silver nitrate solution

+

Sodium chloride solution

\to

Silver chloride precipitate

+

Sodium nitrate solution
iii) Sulphur solid

+

Concentrated nitric acid

\to

Sulphuric acid

+

Nitrogen dioxide gas

+

Water
iv) Barium chloride Solution

+

Potassium sulphate Solution

\to

Barium sulphate Precipitate

+

Potassium chloride solution
v) Silver nitrate on heating

\to

silver metal

+

nitrogen dioxide gas

+

Oxygen gas.
vi) Aluminium hydroxide

+

Nitric acid

\to

Aluminium nitrate

+

Water.

Q. A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the aforementioned solution, a white precipitate is obtained which does not dissolve in dil. nitric acid. The anion is:

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The correct option is B 2H3PO3+2AgNO3+H2O→H3PO4+2Ag+2HNO3Na2HPO3→2Na++HPO2−3 ---- so 2:1 ratio.

The correct option is B 2
$H_{3} P O_{3} + 2 A g N O_{3} + H_{2} O \to H_{3} P O_{4} + 2 A g + 2 H N O_{3}$

$N a_{2} H P O_{3} \to 2 N a^{+} + H P O_{3}^{2 -}$ ---- so 2:1 ratio.