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?

    <p>To remove impurities from the silver alloy</p> Signup and view all the answers

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

    <p>As a reactant</p> Signup and view all the answers

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

    <p>Silver and oxygen</p> Signup and view all the answers

    Which silver halide is soluble in water?

    <p>AgF</p> Signup and view all the answers

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

    <p>Diamine silver (I) chloride</p> Signup and view all the answers

    What happens when silver oxide is treated with ammonium hydroxide?

    <p>It forms a complex ion.</p> Signup and view all the answers

    What is the ore from which silver is extracted?

    <p>Argentite</p> Signup and view all the answers

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

    <p>Potassium dicyano argentate (I)</p> Signup and view all the answers

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

    <p>To dissolve silver compounds in alkali cyanides.</p> Signup and view all the answers

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

    <p>Soluble and reversible.</p> Signup and view all the answers

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

    <p>Sodium nitrate and sodium argentocyanide.</p> Signup and view all the answers

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

    <p>To prevent the formation of silver sulphide.</p> Signup and view all the answers

    What is the oxidation state of gold in auric chloride?

    <p>Gold(III)</p> Signup and view all the answers

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

    <p>Aurous sulphide</p> Signup and view all the answers

    What is the use of chloroauric acid in photography?

    <p>Toning silver prints</p> Signup and view all the answers

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

    <p>Red</p> Signup and view all the answers

    Which process is used to extract gold from its ores?

    <p>Mac-Arthur-Forest Cyanide process</p> Signup and view all the answers

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

    <p>4:1</p> Signup and view all the answers

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

    <p>Chromic acid</p> Signup and view all the answers

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

    <p>To oxidise ferrous salts to ferric salts</p> Signup and view all the answers

    What is the structure of the chromate ion?

    <p>Tetrahedral</p> Signup and view all the answers

    What is the equilibrium reaction between chromates and dichromates?

    <p>2CrO42- ⇌ Cr2O72- + H2O</p> Signup and view all the answers

    What is the oxidation state of manganese in potassium permanganate?

    <p>+7</p> Signup and view all the answers

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

    <p>Potassium manganite</p> Signup and view all the answers

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

    <p>All of the above</p> Signup and view all the answers

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

    <p>Hydrated manganese dioxide</p> Signup and view all the answers

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

    <p>Pyrolusite</p> Signup and view all the answers

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