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.

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 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.

From the list of salts- AgCl, MgCl_(2), NaHSO_(4), PbCO_(3) Choose the salt that most appropriately fits the description given below: An insoluble chloride.

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. The gas which burns with a green flame and reduces a heated metallic oxide to a metal.

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

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.

Fill in the blank spaces by choosing the correct words from the list given below: latent heat of fusion, melting point, steam, constant, latent heat of vaporisation. The amount of heat required to change 1 g of a liquid into its gaseous state without and rise in temperature is called specific ___________.

Fill in the blank spaces by choosing the correct words from the list given below: latent heat of fusion, melting point, steam, constant, latent heat of vaporisation. The amount of heat required to change 1 g of a substance at its melting point into liquid state without any rise in temperature is called specific_________.

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.