d and f-Block Elements

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Questions and Answers

What is the primary purpose of passing an excess of air through the solution in the extraction of silver?

To separate Zn-Ag alloy from molten Pb
To purify the silver alloy
To reduce AgNO3 to metallic silver
To oxidize Na2S into sulphate and thiosulphate (correct)

What is the significance of Zn being volatile in Parke's Process?

It helps in the separation of Ag from Pb (correct)
It helps in the purification of silver
It increases the solubility of Ag in molten Zn
It allows for the formation of a Zn-Ag alloy

What is the composition of the silver alloy used for making jewelry?

80% Ag and 20% Cu (correct)
70% Ag and 30% Cu
90% Ag and 10% Cu
80% Ag and 20% Zn

What is the purpose of cupellation in the purification of silver?

To remove impurities from the silver alloy (A) Signup and view all the answers

What is the use of AgNO3 in the preparation of ink and hair dyes?

As a reactant (D) Signup and view all the answers

What is the product of the decomposition of silver nitrate when heated above its melting point?

Silver and oxygen (D) Signup and view all the answers

Which silver halide is soluble in water?

AgF (B) Signup and view all the answers

What is the name of the pigment formed from the reaction of silver nitrate with NH4OH?

Diamine silver (I) chloride (B) Signup and view all the answers

What happens when silver oxide is treated with ammonium hydroxide?

It forms a complex ion. (B) Signup and view all the answers

What is the ore from which silver is extracted?

Argentite (A) Signup and view all the answers

What is the product of the reaction of silver chloride with KCN?

Potassium dicyano argentate (I) (B) Signup and view all the answers

What is the purpose of blowing air in the extraction of silver using the cyanide process?

To dissolve silver compounds in alkali cyanides. (C) Signup and view all the answers

What is the nature of the complex formed when silver reacts with alkali cyanides?

Soluble and reversible. (C) Signup and view all the answers

What is the product of the reaction between silver nitrate and sodium cyanide?

Sodium nitrate and sodium argentocyanide. (C) Signup and view all the answers

Why is it necessary to prevent the accumulation of sodium sulphide during the extraction of silver?

To prevent the formation of silver sulphide. (C) Signup and view all the answers

What is the oxidation state of gold in auric chloride?

Gold(III) (C) Signup and view all the answers

Which of the following gold compounds is not attached by dilute mineral acids?

Aurous sulphide (C) Signup and view all the answers

What is the use of chloroauric acid in photography?

Toning silver prints (C) Signup and view all the answers

What is the colour of calaverite, an ore of gold?

Red (B) Signup and view all the answers

Which process is used to extract gold from its ores?

Mac-Arthur-Forest Cyanide process (C) Signup and view all the answers

What is the ratio of potassium dichromate to sodium dichromate in a hot concentrated solution?

4:1 (B) Signup and view all the answers

What is formed when chromyl chloride vapours are passed through water?

Chromic acid (C) Signup and view all the answers

What is the use of potassium dichromate as an oxidising agent?

To oxidise ferrous salts to ferric salts (B) Signup and view all the answers

What is the structure of the chromate ion?

Tetrahedral (C) Signup and view all the answers

What is the equilibrium reaction between chromates and dichromates?

2CrO42- ⇌ Cr2O72- + H2O (D) Signup and view all the answers

What is the oxidation state of manganese in potassium permanganate?

+7 (D) Signup and view all the answers

What is the intermediate compound formed during the conversion of pyrolusite to potassium manganate?

Potassium manganite (B) Signup and view all the answers

Which of the following is used to oxidize potassium manganate to potassium permanganate?

All of the above (D) Signup and view all the answers

What is the byproduct formed during the oxidation of potassium manganate to potassium permanganate?

Hydrated manganese dioxide (B) Signup and view all the answers

What is the original source of manganese used to produce potassium permanganate?

Pyrolusite (B) Signup and view all the answers

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