30 Questions
What is the primary purpose of passing an excess of air through the solution in the extraction of silver?
To oxidize Na2S into sulphate and thiosulphate
What is the significance of Zn being volatile in Parke's Process?
It helps in the separation of Ag from Pb
What is the composition of the silver alloy used for making jewelry?
80% Ag and 20% Cu
What is the purpose of cupellation in the purification of silver?
To remove impurities from the silver alloy
What is the use of AgNO3 in the preparation of ink and hair dyes?
As a reactant
What is the product of the decomposition of silver nitrate when heated above its melting point?
Silver and oxygen
Which silver halide is soluble in water?
AgF
What is the name of the pigment formed from the reaction of silver nitrate with NH4OH?
Diamine silver (I) chloride
What happens when silver oxide is treated with ammonium hydroxide?
It forms a complex ion.
What is the ore from which silver is extracted?
Argentite
What is the product of the reaction of silver chloride with KCN?
Potassium dicyano argentate (I)
What is the purpose of blowing air in the extraction of silver using the cyanide process?
To dissolve silver compounds in alkali cyanides.
What is the nature of the complex formed when silver reacts with alkali cyanides?
Soluble and reversible.
What is the product of the reaction between silver nitrate and sodium cyanide?
Sodium nitrate and sodium argentocyanide.
Why is it necessary to prevent the accumulation of sodium sulphide during the extraction of silver?
To prevent the formation of silver sulphide.
What is the oxidation state of gold in auric chloride?
Gold(III)
Which of the following gold compounds is not attached by dilute mineral acids?
Aurous sulphide
What is the use of chloroauric acid in photography?
Toning silver prints
What is the colour of calaverite, an ore of gold?
Red
Which process is used to extract gold from its ores?
Mac-Arthur-Forest Cyanide process
What is the ratio of potassium dichromate to sodium dichromate in a hot concentrated solution?
4:1
What is formed when chromyl chloride vapours are passed through water?
Chromic acid
What is the use of potassium dichromate as an oxidising agent?
To oxidise ferrous salts to ferric salts
What is the structure of the chromate ion?
Tetrahedral
What is the equilibrium reaction between chromates and dichromates?
2CrO42- ⇌ Cr2O72- + H2O
What is the oxidation state of manganese in potassium permanganate?
+7
What is the intermediate compound formed during the conversion of pyrolusite to potassium manganate?
Potassium manganite
Which of the following is used to oxidize potassium manganate to potassium permanganate?
All of the above
What is the byproduct formed during the oxidation of potassium manganate to potassium permanganate?
Hydrated manganese dioxide
What is the original source of manganese used to produce potassium permanganate?
Pyrolusite
This quiz covers various reactions in inorganic chemistry, including oxidation and reduction reactions, formation of compounds, and interactions with organic matter.
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