Chemistry Study Material बिभाग ‘क’

Chemistry Study Material बिभाग ‘क’ Shared By Shridab Khan

Chemistry Study Material बिभाग ‘क’ on mahasarkar.co.in. This is the page where we are deal with Chemistry Study Material For Maharashtra Recruitment Exam. Every questions come from various source i.e. Matter and its Nature; Kinetic Theory of Matter; Chemical Reactions and the chemical Equations; Structure of the Atom; Periodic Table of Elements; Chemical Bonding; Oxidation and Reduction; Oxygen ans Air; Hydrogen and Water; Carbon and its Compounds; Nitrogen and its Compound;Acids; Bases and Salts; Occurrence of Metals; Petroleum and Natural Gas; Iron and steel; Environmental Chemistry and Pollution;Food Chemistry; Biochemistry and Life Processes; Polymers and platics; Electrochemistry; Dyes; Biotechnology; International Symbols for Units; Carbohydrates; Proteins and Nucleic Acids; Nucleoproteins and Nucleic Acids; Fats; Important Laws Governing Gases; Liquids and Solutions; Bioterrorism; Important Topics and Concepts Etc. यह पेज ओह सब स्टूडेंट के लिए है, जो नौकरी की तलाश में हैं और भारती परिक्षा दिने के लिए इच्छुक हैं।

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Chemistry Study Material बिभाग ‘क’

  1. Pure water can be obtained from sea water by the process of

(1) Filtration

(2) Distillation

(3) Evaporation

(4) Fractional distillation

Ans:- (2) Distillation

  1. Common salt is obtained from sea water by the process of

(1) Sublimation

(2) Evaporation

(3) Crystallisation

(4) Filtration

Ans:-

  1. Washing soda is

(1) Sodium chloride

(2) Hydrate sodium carbonate

(3) Sodium bicarbonate

(4) Calcium carbonate

Ans:- (2) Hydrate sodium carbonate

  1. Hard water does not lather well with soap because

(1) It contains carbonates of calcium and magnesium

(2) It is highly coloured

(3) It contains suspended impurities

(4) It contains sodium chloride

Ans:- (1) It contains carbonates of calcium and magnesium

  1. Water, on passing over rocks, becomes hard because it dissolves

(1) Calcium carbonate

(2) Sodium Carbonate

(3) Sodium carbonate

(4) Sodium phosphate

Ans:- (1) Calcium carbonate

  1. Chemically, baking soda is

(1) Calcium phosphate

(2) Sodium bicarbonate

(3) Sodium chloride

(4) Baker’s yeast

Ans:- (2) Sodium bicarbonate

  1. Laundry soap is

(1) A mixture of sodium salts of higher fatty acids of natural origin

(2) Sodium carbonate

(3) A mixture of sodium slats of synthetic sulphonic acids

(4) Sodium sulphate

Ans:- (1) A mixture of sodium salts of higher fatty acids of natural origin

  1. Lime water contains

(1) Sodium hydroxide

(2) Calcium hydroxide

(3) Sodium carbonate

(4) Sodium carbonate

Ans:- (2) Calcium hydroxide

  1. The ratio of different gases in air is

(1) Unknown

(2) Fixed

(3) Different from place to place

(4) Independent of industrialization of towns

Ans:- (3) Different from place to place

  1. Cooking oil can be converted into vegetable ghee by the process of

(1) Hydrogenation

(2) Distillation

(3) Crystallisation

(4) Oxidation

Ans:- (1) Hydrogenation

  1. Iron articles rust because of the formation of

(1) Ferrous chloride

(2) A mixture of ferrous and ferric hydroxides

(3) Ferric sulphate

(4) Ferric chemically

Ans:- (2) A mixture of ferrous and ferric hydroxides

  1. Nitrogen in air

(1) Is essential for the body

(2) Dilutes oxygen which, otherwise, is very active in the pure form

(3) Makes oxygen soluble in blood

(4) Decreases the density of air

Ans:- (2) Dilutes oxygen which, otherwise, is very active in the pure form

  1. Two solutions are said to be isotonic when they

(1) Have the same osmotic pressure

(2) Are of equal concentration

(3) Contain the same solute dissolved in them

(4) Have the same vapour pressure

Ans:- (1) Have the same osmotic pressure

  1. Cooking gas supplied in cylinders by gas agencies is in the form of

(1) Liquid

(2) Gas

(3) Solid

(4) A solution

Ans:- (1) Liquid

  1. Coocking gas is a mixture of

(1) Carbon monoxide and carbon dioxide

(2) Butane and propane

(3) Methane and propane

(4) Carbon dioxide and oxygen

Ans:- (2) Butane and propane

  1. Isobars are elements with

(1) Same mass number, different atomic number

(2) Same atomic number, different mass number

(3) Different number of protons

(4) Different number of neutrons

Ans:- (1) Same mass number, different atomic number

  1. Detergents produce lather with hard water because

(1) They are soluble in hard water

(2) They are colourless substances

(3) The calcium and magnesium salts of sulphonic acids are soluble in water

(4) They form sodium carbonate with hard water

Ans:- (3) The calcium and magnesium salts of sulphonic acids are soluble in water

  1. The gas inside an electric bulb is

(1) Air

(2) Oxygen

(3) Nitrogen

(4) Carbon dioxide

Ans:- (3) Nitrogen

  1. Saturated solution of NaCI on heating becomes

(1) Supersaturated

(2) Unsaturated

(3) Conductor of electricity

(4) Coloured

Ans:- (2) Unsaturated

  1. The ‘absolute zero of temperature’ is

(1) The starting of any scale of temperature

(2) The lowest temperature that is theoretically possible

(3) The temperature at which the vapours of all liquid substance freeze

(4) The temperature at which all substances exist in the vapour

Ans:- (2) The lowest temperature that is theoretically possible

  1. The most abundant gas in the atmosphere is

(1) Carbon dioxide

(2) Nitrogen

(3) Helium

(4) Oxygen

Ans:- (2) Nitrogen

  1. The main chemical substance present in the bones and teeth of animals is

(1) Sodium chloride

(2) Sugar

(3) Calcium phosphate

(4) Calcium sulphate

Ans:- (3) Calcium phosphate

  1. A gas which is not present in normal sample of air is

(1) Stops a chemical reaction

(2)  Helps initiate a reaction

(3) Increases the speed a reaction

(4) Increases the speed reaction

Ans:- (3) Increases the speed a reaction

  1. March gas, formed from decaying organic matter and in coal mines, is

(1) Carbon dioxide

(2) Methane

(3) Ethane

(4) Carbon monoxide

Ans:- (2) Methane

  1. Vinegar is acidic in nature due to the presence of

(1) Vanillic acid

(2) Lactic acid

(3) Hydrochloric acid

(4) Acetic acid

Ans:- (4) Acetic acid

  1. Water for civil supplies is commonly purified by

(1) Chlorination

(2) Distillation

(3) Filtration

(4) Decantation

Ans:- (1) Chlorination

  1. ‘Fixation of nitrogen’ implies

(1) The liquefaction of nitrogen

(2) The conversion of atmospheric nitrogen into useful compounds

(3) The conversion of nitrogen into amines

(4) The solidification of nitrogen gas of the atmosphere

Ans:- (2) The conversion of atmospheric nitrogen into useful compounds

  1. Animal charcoal is obtained by

(1) The destructive distillation of bones

(2) Burning the bones of animals in contact with air

(3) Burning the flesh of animals

(4) Burning the bones of animals out of contact with air

Ans:- (4) Burning the bones of animals out of contact with air

  1. The substance that is added to make natural rubber strong and more bouncy is

(1) Polythene

(2) Sponge

(3) Sulphur

(4) Chlorine

Ans:- (3) Sulphur

  1. ‘Chlorination’ is

(1) A process of converting chlorides into chlorine

(2) Adding small amounts of chlorine to contaminated water

(3) A chemical reaction in which chlorine is formed

(4) The formation of a salt containing chlorine

Ans:- (2) Adding small amounts of chlorine to contaminated water

  1. The metal generally mixed with gold while making ornaments is

(1) Zinc

(2) Iron

(3) Silver

(4) Copper

Ans:- (4) Copper

  1. ‘Gobar gas’ contains mainly

(1) Carbon dioxide

(2) Methane

(3) Acetylene

(4) Ethylene

Ans:- (2) Methane

  1. Heavy water

(1)  Contains more dissolved air

(2) Contains more dissolved minerals and salts

(3) Contains deuterium in place of hydrogen

(4) Contains organic impurities

Ans:- (3) Contains deuterium in place of hydrogen

  1. Polythene is industrially prepared by the polymerization of

(1) Methane

(2) Acetylene

(3) Ethylene

(4) Ethane

Ans:-

  1. The term ‘PVC’ used in the plastic industry stands for

(1) Polyvinyl carbonate

(2) Polyvinyl chloride

(3) Phosphovinyl chloride

(4) Para vinyl chlorobenzene

Ans:- (2) Polyvinyl chloride

  1. The term ‘pH’ denotes the

(1) Temperature of solution

(2) Vapour pressure of solution

(3) Acidity or basicity of solution

(4)  Ionic strength of solution

Ans:- (3) Acidity or basicity of solution

  1. The pH value of 12 is of an aqueous solution of

(1) Sodium hydroxide

(2) Ammonium sulphate

(3) Sodium chloride

(4) Hydrogen chloride

Ans:- (1) Sodium hydroxide

  1. The element which forms the largest number of compounds with hydrogen is

(1) Oxygen

(2) Silicon

(3) Carbon

(4) Boron

Ans:- (3) Carbon

  1. The gas whose aqueous solution is strongly acidic in nature is

(1) Ammonia

(2) Phosphine

(3) Sulphur dioxide

(4) Hydrogen sulphide

Ans:- (3) Sulphur dioxide

  1. The industrial preparation of the metal aluminum from bauxite involves the process of

(1) Fractional crystallization

(2) Fractional distillation

(3) Electrolysis

(4) Reduction

 Ans:- (3) Electrolysis

  1. In natural gas, the compound present in major amounts is made up of hydrogen and

(1) Sulphur

(2) Carbon

(3) Oxygen

(4) Nitrogen

Ans:- (2) Carbon

  1. Styrene is made up of the elements: hydrogen and

(1) Oxygen

(2) Sulphur

(3) Chlorine

(4) Carbon

Ans:- (4) Carbon

  1. The commercially useful property of both ethylene and styrene is their ability to undergo

(1) Combustion

(2) Oxidation

(3) Polymerization

(4) Reduction

Ans:- (3) Polymerization

  1. The compound solution in water has a pH value of lower than seven is

(1) Ethanol

(2) Sugar

(3) Common salt

(4) Vinegar

Ans:- (4) Vinegar

  1. The substance whose aqueous solution would be a better conductor of electrically than water is

(1) Cane sugar

(2) Glucose

(3) Common salt

(4) Ethyl alcohol

Ans:- (3) Common salt

  1. The gas which, on heating at high temperatures under high pressure, trans-forms into a ways solid is

(1)  Chlorine

(2) Hydrogen

(3) Acetylene

(4) Ethylene

Ans:- (4) Ethylene

  1. The substance present in abundant amounts in sea water is

(1) Potassium chloride

(2) Common salt

(3) sand

(4) Calcium carbonate

Ans:- (2) Common salt

  1. The atomic number of an element is equal to the

(1) Number of neutrons in its nucleus

(2) Number of protons in its nucleus

(3) Relative atomic mass

(4) Number of electrons in its outermost orbit

Ans:- (2) Number of protons in its nucleus

49 The gas evolved during the fermentation of a sugar solution is

(1) Sulphur dioxide

(2) Carbon monoxide

(3) Carbon dioxide

(4) Methane

Ans:-  (3) Carbon dioxide

  1. The element not present in fertilizers is

(1) Nitrogen

(2) Hydrogen

(3) Chlorine

(4) Phosphorus

Ans:- (3) Chlorine

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