Practice MCQ Questions and answers on Chemistry-GK

Silicon carbide (SiC), also known as carborundum is a semiconductor containing silicon and carbon. It occurs in nature as the extremely rare mineral moissanite.

German Silver is an alloy of copper, zinc and nickel, sometimes also containing lead and tin. It was originally named for its silver-white colour, but the term 'silver' is now prohibited for alloys not containing that metal.

German Silver does not contain silver.

Type metal, alloy of lead, antimony, and tin used to make type characters for printing. By varying the proportions of the metals, the desired properties are produced for different kinds of typecasting and printing processes.

When metals are required in a ultra pure state, the zone refining method is used. The principle-employed states that the impurities, which lower the melting point of a metal remain preferentially dissolved in the liquid phase and purer metal will emerge in the solid phase.

Brass gets discoloured in air because of Hydrogen sulphide. Transition elements are coloured. The brass is combination of Zn and Cu. But it is discoloured due to hydrogen sulphide in air.

Silver is not present in german silver. German silver is an alloy of Copper, Nickel and Zinc.

Due to resonance, C-X bond in haloarenes acquire a double bond character which makes them more stable than haloalkanes.

The unit of ionic product of water (Kw) is Mol² let^-2.

Aluminium chloride is Lewis acid.