CHEMISTRY

IMPORTANT POINTS FOR +2 EXAMS AND MEDICAL ENTRANCE TESTS

AgBr is used in photography.

Cobalt is present in vitamin B12.

Chloroform (CHCl3) is used as an anaesthetic.

Iodoform (CHI3) is used as an antiseptic. Its antiseptic

action is due to liberation of free iodine.

Buna – S is a synthetic polymer in which ‘S’ stands for

‘styrene’.

Caprolactum is a starting material for Nylon – 6.

Aspartame, sucralose and saccharine are artificial

sweeteners.

Barbituric acid is a tranquilizer.

Chloramphenicol is a broad spectrum antibiotic.

Ore of iron – haematite (Fe2O3), magnetite (Fe3O4).

Ore of copper – chalcopyrite/copper pyrite (CuFeS2), malachite/ basic copper [CuCO3. Cu(OH)2]

Ore of aluminium – bauxite (Al2O3. 2H2O), corundum (Al2O3).

Molality doesn’t depend upon temperature, thus it is

used for measuring concentration of a solution.

The 4 colligative properties are- relative lowering of

vapour pressure, elevation in boiling point, depression in freezing point and osmotic pressure.

Lead storage battery and nickel – cadmium cell are

secondary batteries (cells).

Galvanization involves coating of zinc on iron sheets.

Radioactive decay is a first order reaction.

Concentration of sulphide ore is done by froth –

floatation process.

Mond’s process is used for refining of nickel.