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Chemistry MCQ for Class 10 with Solutions PDF for Students
Wood spirit is:
(a) Ethyl alcohol
(b) Butyl alcohol
(c) Methyl alcohol
(d) Propyl alcohol
Option c – Methyl alcohol
A powerful eye irritant present in smog is:
(a) Carbon dioxide
(b) Sulphur dioxide
(c) Nitric oxide
(d) Peroxyacetyl nitrate
Option d – Peroxyacetyl nitrate
Iodine value is used to estimate:
(a) Alkali content in oil
(b) Unsaturation in oil
(c) Hydroxyl groups in oil
(d) Carboxylic groups in oil
Option b – Unsaturation in oil
Benzene cannot undergo:
(a) Oxidation
(b) Substitution
(c) Addition
(d) Elimination
Option d – Elimination
Radioactive elements emit:
(a) Ultraviolet waves
(b) Infrared waves
(c) Radio waves
(d) α, β, γ radiations
Option d – α, β, γ radiations
Sulphur dioxide level in the atmosphere can be reduced by using:
(a) Low-sulphur fuels
(b) More efficient car engines
(c) Catalytic converters in industry
(d) Static electricity to attract it in factory chimneys
Option a – Low-sulphur fuels
The enormous amount of energy released in an explosion of an atom bomb is due to the:
(a) Conversion of neutrons into protons
(b) Conversion of mechanical energy into nuclear energy
(c) Conversion of mass into energy
(d) Conversion of chemical energy into heat energy
Option a – Conversion of neutrons into protons
Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful:
(a) CO₂ in the air
(b) SO₂ in the air
(c) Solar infrared radiation
(d) Solar ultraviolet radiation
Option d – Solar ultraviolet radiation
The manufacture of iron from iron ore involves the process of:
(a) Oxidation
(b) Reduction
(c) Electrolysis
(d) Fractional distillation
Option a – Oxidation
The function of a sedimentation tank in sewage treatment is to:
(a) Aerate the sewage
(b) Remove water content
(c) Disinfect the sewage
(d) Remove suspended solids
Option d – Remove suspended solids
If lime water is kept in the air, it turns milky due to the presence of:
(a) Nitrogen
(b) Oxygen
(c) Sulphur dioxide
(d) Carbon dioxide
Option d – Carbon dioxide
Which of the following processes is used for the production of Biodiesel?
(a) Translation
(b) Transcription
(c) Transamination
(d) Transesterification
Option d – Transesterification
An atomic pile is used for:
(a) Accelerating atoms
(b) Producing X-rays
(c) Conducting nuclear fission
(d) Conducting thermonuclear fusion
Option c – Conducting nuclear fission
Which of the following is used to iodize common salt?
(a) Iodine
(b) Sodium iodide
(c) Potassium iodide
(d) Potassium iodate
Option d – Potassium iodate
What is the most commonly used substance in fluorescent tubes?
(a) Mercury oxide and neon
(b) Sodium vapour and neon
(c) Sodium oxide and argon
(d) Mercury vapour and argon
Option d – Mercury vapour and argon
Milk is a colloidal system in which:
(a) Fat is dispersed in water
(b) Water is dispersed in fat
(c) Fat and water are dispersed in each other
(d) Fat is dissolved
Option a – Fat is dispersed in water
Pasteurization of milk means:
(a) Heating of milk to above 62°C
(b) Cooling of milk to about 62°C
(c) Heating of milk to above 72°C
(d) Cooling of milk to about 10°C
Option a – Heating of milk to above 62°C
Alum stops bleeding in minor cuts because of:
(a) Emulsion
(b) Coagulation
(c) Solvation
(d) Dialysis
Option b – Coagulation
Photo oxidation process is initiated by:
(a) Heat
(b) Light
(c) Oxygen
(d) Catalyst
Option b – Light
One of the constituents of tear gas is:
(a) Ether
(b) Ethane
(c) Chloropicrin
(d) Ethanol
Option c – Chloropicrin
Which one of the following organic compounds is used to remove stains of iron compounds?
(a) Benzoic acid
(b) Oxalic acid
(c) Cinnamic acid
(d) Phthalic acid
Option b – Oxalic acid
Bleaching powder is used in drinking water as a:
(a) Disinfectant
(b) Coagulant
(c) Antibiotic
(d) Antiseptic
Option a – Disinfectant
What happens when a chemical bond is formed?
(a) Energy is always absorbed
(b) Energy is always released
(c) More energy is released than is absorbed
(d) Energy is neither released nor absorbed
Option a – Energy is always absorbed
What is the name of that system which uses radioactivity to decide the period of materials of pre-historic period?
(a) Radium dating
(b) Uranium dating
(c) Carbon dating
(d) Deuterium dating
Option c – Carbon dating
When Hydrogen starts burning in air, it produces:
(a) Water
(b) Methane
(c) Ammonia
(d) Carbonic acid
Option a – Water
The resources which can be used continuously year after year are called:
(a) Biotic
(b) Renewable
(c) Abiotic
(d) Non-renewable
Option b – Renewable
Which of the following is the maximum number of electrons that can be present in the M-shell?
(a) 2
(b) 8
(c) 18
(d) 32
Option c – 18
Which among the following is a covalent compound?
(a) Sodium chloride
(b) Calcium chloride
(c) Magnesium fluoride
(d) Carbon tetrachloride
Option d – Carbon tetrachloride
Hydrochloric acid is also known as:
(a) Picric acid
(b) Galic acid
(c) Chloric acid
(d) Muriatic acid
Option d – Muriatic acid
The main component of liquid bleach is:
(a) Sodium hypochlorite
(b) Hydrochloric acid
(c) Sodium hypochlorate
(d) Hydrochloric acid
Option a – Sodium hypochlorite
The most suitable unit for expressing nuclear radius is:
(a) Fermi
(b) Micron
(c) Nanometer
(d) Angstrom
Option d – Angstrom
The most abundant element by number in the living system is:
(a) Carbon
(b) Hydrogen
(c) Oxygen
(d) Nitrogen
Option c – Oxygen
The gas dissolved in water that makes it basic is:
(a) Hydrogen
(b) Carbon dioxide
(c) Sulfur dioxide
(d) Ammonia
Option d – Ammonia
Heating of ore below its melting point in the absence of air is known as:
(a) Smelting
(b) Calcination
(c) Roasting
(d) Refining
Option b – Calcination
Which is a natural colloid?
(a) Urea
(b) Blood
(c) Cane-sugar
(d) Sodium chloride
Option b – Blood
In addition to hydrogen, the other abundant element present on the sun’s surface is:
(a) Oxygen
(b) Neon
(c) Argon
(d) Helium
Option d – Helium
The total energy of a revolving electron in an atom:
(a) Can never be positive
(b) Will always be positive
(c) Can have any value above zero
(d) Cannot be negative
Option a – Can never be positive
Taj Mahal is greatly affected due to:
(b) Deforestation
(c) Acid rain
(d) Tourists
Option c – Acid rain
Water gas is the mixture of:
(a) Carbon dioxide and hydrogen
(b) Carbon dioxide and nitrogen
(c) Carbon monoxide and hydrogen
(d) Carbon monoxide and nitrogen
Option c – Carbon monoxide and hydrogen
Which type of extinguisher is used for Petroleum fire?
(a) Foam type
(b) Powder type
(c) Soda acid type
(d) None of these
Option a – Foam type
Alcohol prepared by the distillation of wood is:
(a) Ethyl alcohol
(b) Methyl alcohol
(c) Propyl alcohol
(d) Glycerol
Option b – Methyl alcohol
Which of the following can be used to absorb neutrons to control the chain reaction during nuclear fission?
(a) Uranium
(b) Boron
(c) Plutonium
(d) Heavy water
Option b – Boron
The constituents of automobile exhaust that can cause cancer is:
(a) Carbon monoxide
(b) Polycyclic hydrocarbons
(c) Oxides of nitrogen
(d) Lead
Option d – Lead
Glycol is added to aviation gasoline because it:
(a) Prevents freezing of petrol
(b) Increases efficiency of petrol
(c) Reduces evaporation of petrol
(d) Reduces consumption of petrol
Option a – Prevents freezing of petrol
Cement is formed by strongly heating a mixture of:
(a) Clay and graphite
(b) Limestone and clay
(c) Chalk and graphite
(d) Limestone and graphite
Option b – Limestone and clay
Bone ash contains:
(a) Calcium phosphate
(b) Calcium sulphate
(c) Calcium hypophosphate
(d) Phosphoric sulphate
Option a – Calcium phosphate
Colour imparted to the Bunsen flame by strontium salt is:
(a) Apple green
(b) Bluish green
(c) Crimson red
(d) Brick red
Option c – Crimson red
The material known in commerce as Terylene is:
(a) Natural fibre
(b) Synthetic fibre
(c) Blend of cotton and silk
(d) Modified natural fibre
Option b – Synthetic fibre
What particles move around the nucleus of an atom and are negatively charged?
(a) Protons
(b) Neutrons
(c) Electrons
(d) Positrons
Option c – Electrons
Cement containing excess amount of lime:
(a) Cracks during setting
(b) Is slow setting
(c) Is quick setting
(d) Becomes more strong
Option a – Cracks during setting
Sulphur dioxide bleaches colouring matter by:
(a) Oxidation
(b) Reduction
(c) Dehydration
(d) Decomposition
Option b – Reduction
The filter over which sewage is sprinkled is called:
(a) Contact bed
(b) Percolating filter
(c) Trickling filter
(d) Intermittent sand filter
Option c – Trickling filter
Ethanol containing 5% water is known as:
(a) Absolute alcohol
(b) Power alcohol
(c) Dilute alcohol
(d) Rectified spirit
Option d – Rectified spirit
The hottest part of the gas flame is known as:
(a) Luminous zone
(b) Dark zone
(c) Blue zone
(d) Non-luminous zone
Option a – Luminous zone
In silvery paints, the main constituent present is:
(a) White lead
(b) Silver powder
(c) Lead powder
(d) Aluminium powder
Option d – Aluminium powder
The liquid waste from kitchens and baths of residences is known as:
(a) Refuse
(b) Storm water
(c) Domestic sewage
(d) Sullage
Option d – Sullage
‘Aerosol’ is:
(a) Pollutant gas present in air
(b) Microbes present in air
(c) Suspended solid particle in air
(d) Greenhouse gas present in air
Option c – Suspended solid particle in air
The gas dissolved in water that makes it basic is:
(a) Hydrogen
(b) Carbon dioxide
(c) Ammonia
(d) Sulphur dioxide
Option c – Ammonia
The major use of sulphur is in the manufacture of:
(a) H₂S
(b) H₂SO₄
(c) SO₂
(d) Fungicide
Option b – H₂SO₄
An alloy used in making heating elements for electric heating devices is:
(a) Alloy steel
(b) Nichrome
(c) Solder
(d) German silver
Option b – Nichrome
Which of the following compounds possesses ionic, covalent, and co-ordinate bonds?
(a) H₂O
(b) SO₂
(c) SO₃
(d) NH₄Cl
Option d – NH₄Cl
The non-metal found in the liquid state is:
(a) Chlorine
(b) Fluorine
(c) Bromine
(d) Nitrogen
Option c – Bromine
Sulphuric acid is:
(a) Monobasic
(b) Dibasic
(c) Tribasic
(d) Tetrabasic
Option b – Dibasic
The presence of cobalt in vitamin B₁₂ was established for the first time by:
(a) Borax-Bead test
(b) Spectroscopy
(c) Hydrolysis test
(d) Sodium Nitroprusside test
Option b – Spectroscopy
Which one of the following is used for dating very old objects of archaeological importance?
(a) Radium
(b) Tritium
(c) Carbon-14
(d) Phosphorus-31
Option c – Carbon-14
Tear gas used by the police to disperse the mob contains:
(a) Ammonia
(b) Chlorine
(c) Hydrogen sulphide
(d) Carbon dioxide
Option b – Chlorine
Commercial Vaseline is derived from:
(a) Coal tar
(b) Wool wax
(c) Plant gum
(d) Petroleum
Option d – Petroleum
The common refrigerant in domestic refrigerators is:
(a) Oxygen
(b) Neon
(c) Nitrogen
(d) Freon
Option d – Freon
Name the particle that is most essential to continue the chain reaction during the fission of uranium:
(a) Proton
(b) Electron
(c) Positron
(d) Neutron
Option d – Neutron
The chemical name of rat poison is:
(a) Lead nitrate
(b) Zinc oxide
(c) Zinc phosphide
(d) Potassium cyanide
Option c – Zinc phosphide
One property of ammonia is:
(a) It is insoluble in water
(b) It is an odourless gas
(c) Its aqueous solution turns red litmus blue
(d) It is a yellowish gas
Option c – Its aqueous solution turns red litmus blue
Which one of the following is an example of a gel?
(a) Milk
(b) Face cream
(c) Shaving cream
(d) Cheese
Option b – Face cream
KMnO₄ can be used as a/an:
(a) Fertilizer
(b) Pesticide
(c) Disinfectant
(d) Insecticide
Option c – Disinfectant
Solder metal is an alloy of:
(a) Lead and tin
(b) Copper and zinc
(c) Copper and tin
(d) Lead and antimony
Option a – Lead and tin
Gold dissolves in:
(a) Nitric acid
(b) Acetic acid
(c) Aqua-regia
(d) Hydrochloric acid
Option c – Aqua-regia
Which of the following is used to remove ink and rust stains from cloth?
(a) Alcohol
(b) Ether
(c) Oxalic acid
(d) Kerosene oil
Option c – Oxalic acid
Conversion of chemical energy into electrical energy occurs in:
(a) Electric heaters
(b) Dynamo
(c) Battery
(d) Atomic bombs
Option c – Battery
Which of the following gases is mixed with oxygen for breathing by divers in aqua lungs?
(a) Hydrogen
(b) Nitrogen
(c) Methane
(d) Helium
Option b – Nitrogen
When cathode rays strike a target of high atomic weight, they give rise to:
(a) Positive rays
(b) α-rays
(c) X-rays
(d) β & γ rays
Option c – X-rays
Which one of the following is not a coal variety?
(a) Peat
(b) Lignite
(c) Dolomite
(d) Bituminous
Option c – Dolomite
Catalytic converters are generally made from:
(a) Alkaline metals
(b) Carbon
(c) Hydrogen
(d) Transition metals
Option d – Transition metals
Which of the following elements is obtained from seaweeds?
(a) Sulfur
(b) Argon
(c) Vanadium
(d) Iodine
Option d – Iodine
The gas produced in marshy places due to the decomposition of vegetation is:
(a) Methane
(b) Carbon dioxide
(c) Sulfur dioxide
(d) Carbon monoxide
Option a – Methane
Which one of the following is known as Brown coal?
(a) Coke
(b) Anthracite
(c) Lignite
(d) Bituminous
Option c – Lignite
Earth’s atmosphere is an envelope of gases extending to a height of:
(a) 100 km
(b) 150 km
(c) 200 km
(d) 300 km
Option c – 200 km
Brass gets discolored in air due to constant exposure in the presence of:
(a) Hydrogen sulfide
(b) Aluminum sulfide
(c) Aluminum phosphide
(d) Hydrogenated wafers
Option a – Hydrogen sulfide
The maximum permissible concentration of total hardness in drinking water is:
(a) 500
(b) 200
(c) 100
(d) 50
Option b – 200
What is the second largest component in milk?
(a) Sugar
(b) Fat
(c) Water
(d) Minerals
Option b – Fat
The highest volume of gases in the lower atmosphere is comprised of:
(a) Oxygen
(b) Hydrogen
(c) Nitrogen
(d) Carbon dioxide
Option c – Nitrogen
In an oxygen molecule, two atoms are united by:
(a) One bond
(b) Two bonds
(c) Three bonds
(d) Four bonds
Option b – Two bonds
Muddy water is treated with alum in the purification process. It is termed as:
(a) Coagulation
(b) Absorption
(c) Adsorption
(d) Emulsification
Option a – Coagulation
Organic compounds are:
(a) Ionic compounds
(b) Covalent compounds
(c) Interstitial compounds
(d) Coordination compounds
Option b – Covalent compounds
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