Related InterviewSolutions

• In the exteraction of copper from its sulphide ore, the metal is fanally obtained by the reduction of caprous oxide withA. copper (I) sulphide `(Cu_(2)S)`B. sulphur dioxide `(SO_(2))`C. iron sulphide (FeS)D. carbon monoxide (CO)
• The method of zone refining of metals is based on the principle of :A. greater noble character of the solid metal than that of the impurityB. greater solubility of the impurity in the molten state than in the solidC. greater mobility of the pure metal than that of impurityD. higher melting point of the impurity than that of the pure metal
• Elemental `Si` in to be used as a semicondictor is parified byA. heating under vacuumB. floatationC. zone refiningD. electrolysis
• Calcium is obtained by theA. roasting of limestoneB. electrolysis of solution of calcium chloride in `H_(2)O`C. electrolysis of molten anhydrous calcium chlorideD. reduction of calcium chloride with carbon
• Which of the following is not a mineral of iron?A. MalachiteB. CassiteriteC. PyrolusiteD. Magnetite
• Calgon used as water softener isA. `Na_(2)[Na_(4)(PO_(3))_(6)]`B. `Na_(4)[Na_(2)(PO_(3))_(6)]`C. `Na_(4)[Na_(4)(PO_(4))_(5)]`D. `Na_(4)[Na_(2)(PO_(4))_(6)]`
• In the exteraction of copper from its sulphide ore, the metal is fanally obtained by the reduction of caprous oxide withA. iron (II) sulphideB. carbon monoxideC. copper (I) sulphideD. sulphur dioxide
• Aluminum is exteracted from alumine `AI_(2)O_(3)` by electrolysis of a molten mixture of :A. `Al_(2)O_(3) + HF + NaAlF_(4)`B. `Al_(2)O_(3) + CaF_(2) + NaAlF_(4)`C. `Al_(2)O_(3) + Na_(3)AlF_(6) + CaF_(2)`D. `Al_(2)O_(3) + KF + Na_(3)AlF_(6)`
• Roasting of sulphides gives the gas X as a by product. This is a colourless gas with choking smell of burnt sulphur and causes great damage to repiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as reducing agent and its acid has never been isolated. The gas X is :-A. `H_(2)S`B. `SO_(2)`C. `CO_(2)`D. `SO_(3)`
• The reaction of `H_(2)O_(2)` with hydrogen sulphide is an example of ………… reaction.A. additionB. oxidationC. reductionD. acidic