Surface Chemistry and Isolation of Elements

Identify the gas which is readily adsorbed by activated charcoal

Activated charcoal is used to remove colouring matter from pure substances.It works by

The base principle of Cottrell’s precipitator is

Which one of the following does not involve coagulation

If the adsorbate is held on a surface by weak Van der Walls forces, the absorption process is called

Which one of the following is a false statement

Shape-selective catalysis is a reaction catalysed by

Hair cream is an example of

Which one of the following is correctly matched

Choose the incorrect statement in respect of physisorption

On palladium the adsorption of hydrogen is known as

Wood charcoal is used to decolourise suger because it

Which has least gold number

Which one of the following is an example of heterogenous catalysis

Colloidal solution of gold is prepared by

Calcination is used in metallurgy to remove

Roasting is done in

Method used for obtaining highly pure silicon, used as a semiconductor material, is

Mg is present in

Aluminium is extracted from alumina (Al₂O₃) by electrolysis of a molten mixture of

Pyrolusite is an ore of

The role of cryolite in the metallurgy of extraction of aluminium is to

Silver is present in

The method of zone refining of metals is based on the principle of

The ore horn silver corresponds to

One of the following metals is obtained by leaching its ore with dilute cyanide solution, Identify it.

Malachite is an ore of

The metal used to recover copper from a solution of copper sulphate is

Copper pyrite, the chief ore of copper, is

Bauxite is concentrated by

Thomas slag is

Sea weeds are an important source of

Electromagnetic separation is used in the concentration of

Carnallite on electrolysis gives

Which of the following sulphides when heated strongly in air gives the corresponding metal

Among the metals Cr,Fe,Mn,Ti,Ba and Mg, the one that cannot be obtained by reduction of its metal oxide by aluminium is

The method not used in metallurgy to refine the impure metal is

Which one of the following is not a sulphide ore

Which metal is extracted by complexing with KCN

Hydro-metallurgical process of extraction of metals is based on

Impurities present in the ore react to form a fusible substance known as

Which one of the following is true in electrolytic refining

Carborundum is

Cassiterite is concentrated by

Froth floatation process is used for the concentration of

When the ore limestone is heated carbon dioxide is given off. This operation in metallurgy is known as

Galena is an ore of

In the extraction of aluminium from bauxite, cryolite is used to

Which of the following is an ore of aluminium

Aluminium is obtained by