From the list of term given, choose the most appropriate term to match the given desciption :
[clacination, roasting, pulverisation, emrlting] - (i) Crushing of the ore into a fine powder.
(ii) Heating of the ore in the absence of air to a high temperature.

From the list of terms given, choose the most appropriate term to match the given description. (calcination, roasting, pulverisation, smelting) 1. Crushing of the ore into a fine powder. 2. Heating of the ore in the absence of air to a high temperature.

Match list I with list II and choose the correct answer from the codes given below :

From the list of gases given, choose the gas/gases which match the description given below: Gases : Ammonia, nitrogen dioxide, methane, nitric oxide, hydrogen, oxygen, chlorine, nitrogen. Two gases which react in the presence of copper catalyst at high temperatures to give an alcohol.

Match list - I with list - II and choose the correct answer from the code given below Codes are

Give the appropriate term defined by the statement given : The process by which certain ores, specially carbonates, are converted to oxides in the absence of air.

Give the appropriate term defined by the statements given below : The process by which certain ores, specially carbonates are converted to oxide in the absence of air.

Consider the following metallurgical processes : (I) Electrolysis of molten mixiure of about 40% metal chloride and 60% calcium chloride (II) Heating the impure metal with l_2 at around 523 K to from metal iodide and their subsequent decomposition at higher temperature to yield pure metal (III) Heating the sulphide ore in the presence of air untill a part of it is converted to its oxide and the further heating the oxide in the absence of air with metal sulphide to produce metal The process used for obtaining titanium sodium and copper repsectively are

Match the terms given in Column-I with their descriptions given in Column-II and select the correct option from the codes given below.

Choose from the following list of substances, as to what matches the description given below: [Acetylene gas, aqua fortis, coke, brass, barium chloride, bronze, platinum). (i) A black powdery substance used for the reduction of zinc oxide during its extraction. (ii) The substance is an alloy of zinc, copper and tin.