Please select a subject first
Advertisements
Advertisements
Silica is added to roasted copper ore during smelting process to remove _______.
(A) ferrous sulphide
(B) ferrous oxide
(C) cuprous sulphide
(D) cuprous oxide
Concept: Occurrence of Metals
Define Hydrometallurgy?
Concept: Oxidation Reduction
Explain refining of nickel by Mond process.
Concept: Electrochemical Principles of Metallurgy
What is the process in which concentrated ore is reduced to the corresponding metal by heating at high temperature with a reducing agent?
(a) Polling
(b) Pyrometallurgy
(c) Hydrometallurgy
(d) Calcination
Concept: Oxidation Reduction
Sucrose decomposes in acid solution to give glucose and fructose according to the first order rate law. The half life of the reaction is 3 hours. Calculate fraction of sucrose which will remain after 8 hours.
Concept: Half Life Period of a Reaction
Write chemical formulae of the following ores :
(a) Calamine
(b) Haematite
(c) Magnetite
(d) Corundum
Concept: Occurrence of Metals
Write the reactions involved in extraction of silver from its ore by leaching process.
Concept: Electrochemical Principles of Metallurgy
For a first order reaction, show that time required for 99% completion is twice the time required for the completion of 90% of reaction.
Concept: Half Life Period of a Reaction
A first order reaction takes 40 minutes for 30% decomposition. Calculate t1/2 for this reaction. (Given log 1.428 = 0.1548)
Concept: Half Life Period of a Reaction
Fe2O3 is reduced to spongy iron near the top of blast furance by
(A) H2
(B) CaO
(C) SiO2
(D) CO
Concept: Occurrence of Metals
Mention names and formulae of two ores of alumunium.
Concept: Occurrence of Metals
Draw neat and labelled diagram of Bessermer converter used in the extraction of copper.
Concept: Occurrence of Metals
The rate of reaction for certain reaction is expressed as:
`1/3(d[A])/dt=-1/2(d[B])/dt=-(d[C])/dt`
The reaction is ______.
Concept: Rate of Reactions
A first order reaction takes 23.1 minutes for 50% completion. Calculate the time required for 75% completion of this reaction.
(log 2 = 0.301, log 3 = 0.4771, log 4 = 0.6021)
Concept: Half Life Period of a Reaction
MnO2 and Ca3(PO4)2 present in iron ore get reduced to Mn and P in the zone of _______.
(A) combustion
(B) reduction
(C) fusion
(D) slag formation
Concept: Oxidation Reduction
Explain magnetic separation process of ores with the help of a neat, labelled diagram.
Concept: General Principles and Processes of Isolation of Elements >> Principles and Methods of Extraction - Concentration
Define Leaching.
Concept: Occurrence of Metals
The unit of rate constant for zero order reaction is _______.
(A) t–1
(B) mol dm–3 t–1
(C) mol–1 dm3 t–1
(D) mol–2 dm6 t–1
Concept: Half Life Period of a Reaction
Calcium carbonate used in the extraction of iron acts as _______.
(A) oxidising agent
(B) reducing agent
(C) gangue
(D) flux
Concept: General Principles and Processes of Isolation of Elements >> Principles and Methods of Extraction - Concentration
Write the names and chemical formulae of any ‘two’ minerals of aluminium.
Concept: Occurrence of Metals
