Related InterviewSolutions

• Oxygen is the most abundant element. Aluminium is the most abundant metal.A. If both (A) and ( R) are correct and ( R) is the correct explanation of (A).B. If both (A) and ( R) are correct, but ( R) is not the correct explanation of (A).C. If (A) is correct, but ( R) is incorrect.D. If (A) is incorrect, but ( R) is correct.
• All metals cannot be obtained by carbon reduction. Carbon is a very strong reducing agent.A. If both (A) and ( R) are correct and ( R) is the correct explanation of (A).B. If both (A) and ( R) are correct, but ( R) is not the correct explanation of (A).C. If (A) is correct, but ( R) is incorrect.D. If (A) is incorrect, but ( R) is correct.
• Select the correct statements for Ellingham diagram.A. The slope of the curves of the formation of metal oxide is `+ve` because `Delta_(f) G^(Ө)` becomes less negative or increases with the rise in temperature.B. Each curve is a straight line except when some change takes place in phase `(s rarr 1 or 1 rarr g)`C. Each curve is not a straight line except when some changes takes place in phase `(s rarr 1 or 1 rarr g)`.D. The slope of the curves of the formation of metal oxide is `-ve` becomes less negative or increases with the rise in temperature.
• Which of the following statements is/are correct ?A. The chemical processes in the production of steel from haematite ore involve reduction followed by oxidation.B. Lead is extracted from its chief ore galena by both carbon reduction as well as self-reduction.C. In Hall-Heroult process, the electrolyte used is a molten mixture of alumina and cryolite or fluorspar.D. Haematite, cassiterite and argentite are oxide ores.
• Select the correct statements for calcination :A. Carbonate ore is converted in oxide oreB. Hydrated oxide ore is converted into its oxide oreC. Oxidisable volatile impurities are removed by calcination processD. Only calcination occurs for carbinate or oxide ore
• Calcination is the process of heating the ore strongly in the _____of air.
• An ore of tin containing `FeCrO_(4)` is concentrated by _____.
• In the leaching of `Ag_(2)S` with `NaCN`, a stream air is also passed. It is because ofA. Reversible nature of reaction between `Ag_(2)S` and `NaCN`B. Oxidised `Na_(2)S` formed into `Na_(2)SO_(4)`C. Irreversible nature of reaction between `Ag_(2)S` and `NaCN`D. None of above
• The metal present in chlorophyll is ______
• For the pyrometallurgical method used for the extraction of copper from sulphide ore, which statements is//are correct ?A. Pyrometallurgy is a dry methodB. It involves concentration by leaching the sulphide ore with dil. `H_(2)SO_(4)`.C. It involves concentration of the sulphide ore by froth flotation processD. It involves concentration by leaching for every ore.