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Friday, 9 October 2026

KERALA PSC / CHEMISTRY / PREVIOUS QUESTION PAPERS / SOLVED QUESTION PAPERS / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY / NOTES

KERALA PSC / CHEMISTRY / PREVIOUS QUESTION PAPERS / SOLVED QUESTION PAPERS / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY / NOTES

· The principal nuclear fuel in the sun is

Hydrogen

· The element found in abundance in the sun are

Hydrogen and Helium

· The age of different layers of the earth are ascertained by the use of isotopes of

Carbon

· Water is

A compound

· The symbol of element sodium is

· In the nucleus of an atom, the particles situated are

Proton and neutron

· In a nuclear reactor, the control rods are made of

Cadmium

· Calgon is

Sodium hexametaphosphate

· The chemical name of Caustic Soda is

Sodium hydroxide (NaOH)

· The molecular formula of saturated hydrocarbon is

CₙH₂ₙ₊₂

· It is helpful in ripening the unripe fruits

Ethylene

· The medicine which reduces the fever is called

Antipyretic

· The bacteria which dissociate the nitrates of the soil and free nitrogen are called

Dentitrifying bacteria

· The scientist who invented radioactivity is

Henry Becquerel

· The particle having a major role in binding the nucleus is

Meson

· Which material is used for control rods in Uranium reactions?

Boron steel

· Mercury is best purified by

Vacuum distillation

· The lightest metal is

Lithium

· One of the hardest material is

Diamond

· Cathode ray consist of

Electrons

· Natural rubber is polymer of

Isoprene

· Monomer of polymer polythene

Ethene

· Lindlar catalyst is

Pd/CaCO₃

· The number of moles in 1 mole of a substance is

6.023 × 10₂₃

· The carbon content in steel is

0.02 to 1.5%

· First human made element

Polonium

· Lithium shows diagonal relationship with

Magnesium

· Heavy water is

D₂O

· This substance harms human body due to smoking

Nicotine

· The periodic table arranges the elements in order of

Atomic number

· The name of hydrogen was proposed by

Lavoisier

· Which isotope of hydrogen is radioactive in nature?

Tritium

· First man made element is

Technetium

· Which metal has the highest melting point?

Tungsten

· Brass is an alloy of

Copper, Zinc

· The metal used for galvanization of iron sheets is

Zinc

· Which transition metal has the highest density?

Osmium

· The most abundant alkali metal is

Sodium

· The formula of bleaching powder is

CaOCl₂

· The wire of flash bulb is made up of

Magnesium

· Bauxite is an ore of

Aluminium

· Which metal is present in Chlorophyll?

Magnesium

· Which halogen is radio active in nature?

Astatine

KERALA PSC / CHEMISTRY / PREVIOUS QUESTION PAPERS / SOLVED QUESTION PAPERS / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY / NOTES

KERALA PSC / CHEMISTRY / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY / NOTES

KERALA PSC / CHEMISTRY / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY / NOTES

· Kevlar is a material for making bullet proof dresses

· The oil in water is an example of suspension

· Catalyst in a chemical reaction generally helps to accelerate the reaction

· The main use of salt in the diet is to produce hydrochloric acid to digest the food

· Chlorination means the addition of a small quantity of chlorine in water as a germicide

· Hydrogen has the same atomic number and mass number

· The ultimate source of nitrogen is the atmosphere but, plants and animals cannot assimilate atmospheric nitrogen directly

· The animals get their nitrogen supply in the form of proteins from plants which in turn get their nitrogen supply from the soil in the form of nitrates.

· Ammonia (NH₃) is a compound of nitrogen. It can be manufactured by combining nitrogen and hydrogen at low temperature under high pressure

· Air pollution caused by automobiles can be reduced by using lead free petrol and design alternations in automobiles

· Carbon monoxide (CO) is most carcinogenic in nature

· Normal Oxygen (O₂) and Ozone (O₃) are allotropes of oxygen

· Diamond, corundum and topaz are all very hard. A scale called Moh’s scale is used to indicate the degree of hardness of minerals

· Purest form of iron is wrought iron

· Pure water is obtained from sea water by the process of distillation

· Helium is preferred to hydrogen in air balloons because it does not form an explosive mixture with air

· Oils and fats are naturally occurring compounds that belonging to lipids

· Hydrogenation (hardening of oil) is a process of converting an oil into a fat example vegetable ghee. In which hydrogen gas is passed through the oil in the presence of nickel catalyst.

· Batho chromic groups cause displacement to longer wavelengths, while hypsochromic groups cause displacement to the shorter wavelengths.

· Caprolactum obtained from cyclohexane

· Dichloro Diphenyl Trichloro ethane (DDT), Benzene Hexa chloride ie, BHC (Gammeexane) are organic insecticides

· Sulpha drugs are used as antibacterial

· Turpentine oil is commercially obtained from pine tree

· CFCs are also known as Ozone Depleting Substances (ODS) for it causes depletion of the ozone layer

· Freon (Dichloro difluoro Methane) it is used as refrigerant

· Ozone depleting substance include, Bromine containing compounds halons and HBFCs (hydrobromo fluro carbons) both used in fire extinguishers. Methyl bromide (pesticide). Each bromine atom destroys hundreds of times more zone molecules than does a chlorine atom.

· Alkaline solution of copper sulphate and sodium citrate is called Benedict solution, which is used to detect glucose in urine

· The lead pencils contain graphite and clay

· Osmosis: It is the phenomenon of flow of pure solvent from a less concentrated solution to a more concentrated solution through a semi permeable membrane.

· Buffers: A solution which resist change in pH by the addition of small amount of acid or base.

· Sorenson (1909) introduced the term pH to express H+ ion concentration

· pH of important Biological fluids

Blood 7.35 – 7.45

Tear 7.2 – 7.4

Saliva 6.4 – 7

Gastric Juice 1.5 – 3.0

· Isomerism: The compounds possessing identical molecular formulae but different structures are referred to as isomers. The phenomenon of existence of isomers is called isomerism.

KERALA PSC / CHEMISTRY / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE / KERALA PSC PRELIMINARY / NOTES