Chemistry MCQ (Multiple Choice Questions) - SchoolingAxis

Chemistry MCQ (Multiple Choice Questions)

 Que- Which one is heaviest naturally occurring element of the periodic element? 

a. Iron 

b. Thorium 

c. Rhodium 

d. Uranium 


Answer- Uranium


Que- Activated Charcoal is used to remove colouring matter from pure substances by 

a. Bleaching 

b. Oxidation 

c. Adsorption 

d. Reduction 


Answer- Adsorption


Que- The molecular mass of a gas is 

a. Twice its vapour pressure 

b. Equal to its vapour pressure 

c. Half its vapour pressure 

d. Not related to its vapour pressure 


Answer- Twice its vapour pressure


Que- The value of gas constant R in Ergs deg–1 mole–1 is 

a. 8.314 × 107 

b. 8.341 × 107 

c. 8.413 × 107 

d. 4.183 × 107 


Answer- 8.314 × 107


Que- The absolute temperature of a gas is doubled and the pressure is reduced to half, the volume of the gas 

a. Remains unchanged 

b. Will be doubled 

c. Will increase four-fold 

d. Will be reduced to half 


Answer- Will increase four-fold


Que- Isobars are lines joining places having equal 

a. Rainfall 

b. Pressure 

c. Population 

d. Height above sea-level 


Answer- Pressure


Que- Which of the following could be used as fuel in propellant or rockets ? 

a. Liquid Hydrogen + Liquid Nitrogen 

b. Liquid Oxygen + Liquid Argon 

c. Liquid Nitrogen + Liquid Oxygen 

d. Liquid Hydrogen + Liquid Oxygen 


Answer- Liquid Hydrogen + Liquid Oxygen


Que- Which gas is used for converting vegetable oils into saturated fats ? 

a. H2 

b. O2 

c. Cl2 

d. SO2 


Answer- H2


Que- Which of the following gases will effuse out of football bladder most quickly ? 

a. He 

b. H2 

c. N2 

d. O2 


Answer- H2


Que- The property of hydrogen which distinguishes it from alkali metals is 

a. Its electropositive character 

b. Its affinity for non-metal 

c. Its reducing character 

d. Its non-metallic character 


Answer- Its non-metallic character


Que- Hydrogen is not found in atmosphere because 

a. It is highly inflammable 

b. It is the lightest gas 

c. It is absorbed by plants 

d. It immediately combines with oxygen to form water 


Answer- It is the lightest gas


Que- Which among the following is used as a catalyst in the production of high octane fuels? 

a. HNO3 

b. H2SO4 

c. HCl 

d. HF 


Answer- H2SO4


Que- Catalytic converters are generally made from : 

a. Alkaline metals 

b. Hydrogen 

c. Transition metals 

d. Carbon 


Answer- Transition metals


Que- Which of the following is colourless? 

a. Chlorine 

b. Oxygen 

c. Phosphorus 

d. Sulphur 


Answer- Oxygen


Que- Iodine value is used to estimate 

a. Hydroxyl groups in oil 

b. Alkali content in oil 

c. Unsaturation in oil 

d. Carboxylic groups in oil 


Answer- Unsaturation in oil


Que- The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is 

a. Xenon 

b. Krypton 

c. Argon 

d. Helium 


Answer- Helium


Que- Ozone layer of atmosphere absorbs:  

a. Ultraviolet rays 

b. Infra-red rays 

c. All radiations of Light 

d. Cosmic rays. 


Answer- Ultraviolet rays


Que- Air shows the property of 

a. N2 

b. O2 

c. Both A and B 

d. None of these 


Answer- Both A and B


Que- The most abundant constituent of atmospheric air is : 

a. Carbon 

b. Hydrogen 

c. Oxygen 

d. Nitrogen 


Answer- Nitrogen


Que- The percentage of oxygen in air is approximately 

a. 100% 

b. 1% 

c. 78% 

d. 21% 


Answer- 21%


Que- The major constituent of air is 

a. Nitrogen 

b. Carbon dioxide 

c. Oxygen 

d. Hydrogen 


Answer- Nitrogen


Que- Seaweeds are important source of 

a. Iron 

b. Chlorine 

c. Bromine 

d. Iodine 


Answer- Iodine


Que- Sea weeds are important source of 

a. Fluorine 

b. Chlorine 

c. Bromine 

d. Iodine 


Answer- Iodine


Que- The strongest oxidizing agent among the following is: 

a. Chlorine 

b. Iodine 

c. Fluorine 

d. Oxygen 


Answer- Fluorine


Que- Helium is added to the oxygen supply of deep sea divers because it is 

a. Less poisonous than nitrogen 

b. Lighter than nitrogen 

c. Readily miscible with oxygen 

d. Less soluble in blood than nitrogen at high pressure 


Answer- Less soluble in blood than nitrogen at high pressure


Que- Vulcanization of rubber is carried out by adding 

a. Sulphur 

b. Carbon 

c. Ozone 

d. Phosphorus 


Answer- Sulphur


Que- Ozone consists of 

a. Oxygen only 

b. Oxygen and Nitrogen 

c. Hydrogen and Carbon 

d. Oxygen and Carbon 


Answer- Oxygen only


Que- Ozone layer is present in 

a. Troposphere 

b. Ionosphere 

c. Stratosphere 

d. Exosphere 


Answer- Stratosphere


Que- The presence of ozone in the stratosphere is responsible for 

a. Increasing the average global temperature in recent years 

b. Higher rate of photosynthesis 

c. Checking the penetration of ultraviolet rays to the earth 

d. Supplying oxygen for people travelling in jets 


Answer- Checking the penetration of ultraviolet rays to the earth


Que- The major use of sulphur is in the manufacture of 

a. H2SO4 

b. H2S 

c. SO2 

d. Fungicide 


Answer- H2SO4


Que- Percentage of lead in lead pencils is 

a. 0 

b. 31-66 

c. 40 

d. 80 


Answer- 0


Que- Mark the compound which possess ionic, covalent and coordinate bonds. 

a. NH4Cl 

b. SO3 

c. SO2 

d. H2O 


Answer- NH4Cl


Que- The most commonly used chemicals in the artificial rainmaking or cloud seeding are 

a. Silver Iodide (AgI) 

b. Sodium Chloride (NaCl) 

c. Dry Ice (Frozen CO2) 

d. All of the above 


Answer- Silver Iodide (AgI)


Que- Malathion is a/an 

a. Insecticide 

b. Fumigant 

c. Preservative 

d. Pesticide 


Answer- Insecticide


Que- The chemical name of rat poison is 

a. Zinc oxide 

b. Potassium cyanide 

c. Lead nitrate 

d. Zinc phosphide 


Answer- Zinc phosphide


Que- Which of the toxic heavy metals is found in modern tannery industries ? 

a. Nickel 

b. Zinc 

c. Chromium 

d. Lead 


Answer- Chromium


Que- The antiseptic compound present in dettol is 

a. Iodine 

b. chloroxylenol 

c. Biothional 

d. Cresol 


Answer- chloroxylenol


Que- Cement is usually a mixture of : 

a. Calcium silicate and calcium aluminate 

b. Calcium silicate and calcium ferrate 

c. Calcium aluminate and calcium ferrate 

d. Lime stone and silicon dioxide 


Answer- Calcium silicate and calcium aluminate


Que- Sodium bicarbonate is commercially known as 

a. Washing soda 

b. Baking soda 

c. Caustic soda 

d. Soda lime 


Answer- Baking soda


Que- Which of the following is the main nitrogenous waste in humans ? 

a. Ammonia 

b. Urea 

c. Uric Acid 

d. Ammonium Nitrate 


Answer- Uric Acid


Que- Quartz is a crystalline form of 

a. Alumina 

b. Glass 

c. Silica 

d. Limestone 


Answer- Silica


Que- Urea is a 

a. Sodium fertilizer 

b. Phosphatic fertilizer 

c. Nitrogenous fertilizer 

d. Potassium fertilizer 


Answer- Nitrogenous fertilizer


Que- Removal of carbon particles from air involves the principle of 

a. Precipitation 

b. Filteration 

c. Electrophoresis 

d. Sedimentation 


Answer- Electrophoresis


Que- Physico-chemical characteristics of water in water sources undergo changes due to 

a. Aquatic macrophytes 

b. Auatic fungi 

c. Effluents 

d. Evapotranspiration 


Answer- Effluents


Que- Sulphur dioxide present in the industrial chimney exhaust causes 

a. Respiratory and lung disease 

b. Reduction in plant's productivity owing to acid rain 

c. Corrosion building materials 

d. All of the above 


Answer- All of the above


Que- Coating of solid waste with impervious material is known as 

a. Encapsulation 

b. Chemical fixation 

c. Landfill 

d. Capping 


Answer- Encapsulation


Que- Taj Mahal is greatly affected due to : 

a. Tourists 

b. Acid rain 

c. Deforestation 

d. Sound pollution 


Answer- Acid rain


Que- Froth floatation process to concentrate the minerals is applicable to 

a. Calamine 

b. Chalcopyrites 

c. Bauxite 

d. Haematite 


Answer- Chalcopyrites


Que- Chemical name of Gammaxane is 

a. Toluene 

b. Chloro benzene 

c. Aniline 

d. Benzene hexachloride 


Answer- Chloro benzene


Que- Epsom salt is used 

a. As purgative 

b. In softening water 

c. In paper industry 

d. In making tooth paste 


Answer- As purgative


Que- The metal extracted from Bauxite is : 

a. Silver 

b. Copper 

c. Manganese 

d. Aluminium 


Answer- Aluminium


Que- Among the following iron ores, the highest percentage of iron content is found in– 

a. Haemetite 

b. Magnetite 

c. Limnonite 

d. None of these 


Answer- Haemetite


Que- Natural rubber is the polymer of : 

a. Isoprene 

b. Styrene 

c. Butadiene 

d. Ethylene 


Answer- Isoprene


Que- The basic chemical building block of natural rubber obtained from trees is 

a. Isoprene 

b. Vinyl Chloride 

c. Acetylene 

d. Neoprene 


Answer- Isoprene


Que- The name of plastic polymer from which combs, toys, bowls etc., can be made, is 

a. Polyurethane 

b. Polystyrene 

c. Metallic polysulphides 

d. Teflon 


Answer- Polystyrene


Que- A polymeric substance used to make parachute is 

a. Rayon 

b. Viscose 

c. Cotton 

d. Terylene 


Answer- Viscose


Que- PVC is obtained by the polymerisation of 

a. Propane 

b. Vinyl chloride 

c. Styrene 

d. Acetylene 


Answer- Vinyl chloride


Que- Water cycle refers to 

a. An integrated attempt to recycle water in relatively arid regions 

b. Constant movement of water from ocean to land and back to ocean once again 

c. Scientific management of water in areas excessively plagued with water-logging 

d. Water distribution in relatively dry areas 


Answer- Constant movement of water from ocean to land and back to ocean once again


Que- Permanent hardness of water may be removed by addition of 

a. Alum 

b. Sodium carbonate 

c. Lime 

d. Potassium Permangante 


Answer- Sodium carbonate


Que- Acid rain is caused due to pollution of atmosphere by 

a. Oxides of carbon and nitrogen 

b. Oxides of nitrogen and sulphur 

c. Oxides of nitrogen and phosphorous 

d. None of these 


Answer- Oxides of nitrogen and sulphur


Que- What are the components responsible for acid rain? 

a. Nitrogen monoxide (NO) and Carbon monoxide (CO) 

b. Sulphur dioxide (SO2) and Nitrogen oxides (NOx) 

c. Carbon dioxide (CO2) and Carbon monoxide (CO) 

d. Oxides of carbon (COx) and Oxides of nitrogen (NOx) 


Answer- Sulphur dioxide (SO2) and Nitrogen oxides (NOx)


Que- Which gas emitted by power stations causes acid rain? 

a. Carbon dioxide 

b. Sulphur dioxide 

c. Helium 

d. Nitrogen 


Answer- Sulphur dioxide


Que- Which of the following is very reactive and kept in kerosene? 

a. Sodium 

b. Potassium 

c. Iodine 

d. Bromine 


Answer- Sodium


Que- Which metal does not undergo corrosion due to the formation of oxide layer? 

a. Copper 

b. Iron 

c. Aluminium 

d. Zinc 


Answer- Aluminium


Que- The wire of flash bulb is made of: 

a. Copper 

b. Barium 

c. Magnesium 

d. Silver 


Answer- Magnesium


Que- Identify the metal which is non toxic in nature. 

a. Chromium 

b. Gold 

c. Cadmium 

d. Cobalt 


Answer- Gold


Que- Iron rusts quickly in 

a. Rain water 

b. Sea water 

c. Distilled water 

d. River water 


Answer- Sea water


Que- Which substance is used to retard the setting action of cement? 

a. CaO 

b. Al2O3 

c. CaSO4.2H2O 

d. Na2O + K2O 


Answer- CaSO4.2H2O


Que- Stalactites and Stalagmites form due to the precipitation of : 

a. CaCO3 

b. CaCl2 

c. MgCl2 

d. MgCO3 


Answer- CaCO3


Que- Which of the following is not a precious/semi-precious stone? 

a. Sapphire 

b. Ruby 

c. Pearl 

d. Emerald 


Answer- Pearl


Que- The chemical substance present in bones and teeth is 

a. Calcium phosphate 

b. Calcium chloride 

c. Calcium sulphate 

d. Calcium borate 


Answer- Calcium phosphate


Que- The chemical substance present in bones and teeth is 

a. Calcium phosphate 

b. Calcium chloride 

c. Calcium sulphate 

d. Calcium borate 


Answer- Calcium phosphate


Que- In sugar solution, 

a. Sugar is solute, water is solvent 

b. Sugar is solvent, water is solute 

c. Both are solutes 

d. Both are solvents 


Answer- Sugar is solute, water is solvent


Que- The metallic constituents of hard water are : 

a. Magnesium, calcium and tin 

b. Iron, tin and calcium 

c. Calcium, magnesium and iron 

d. Magnesium, tin and iron 


Answer- Calcium, magnesium and iron


Que- Potassium Permanganate is used for purifying drinking water, because________ 

a. It is a reducing agent 

b. It is an oxidising agent 

c. It is a sterilising agent 

d. It dissolves the impurities of water 


Answer- It is an oxidising agent


Que- Lead in water can cause 

a. Eye disease 

b. Arthritis 

c. Kidney damage 

d. Hair falling 


Answer- Kidney damage


Que- Hardness of the water is commonly measured in terms of 

a. Calcium carbonate equivalents 

b. Calcium sulphate equivalents 

c. Magnesium carbonate equivalents 

d. Magnesium sulphate equivalents 


Answer- Calcium carbonate equivalents


Que- The chief source of naphthalene is 

a. Coal-tar 

b. Diesel 

c. Charcoal 

d. Camphor 


Answer- Coal-tar


Que- The gas that usually causes explosions in coal mines is 

a. Hydrogen 

b. Carbon monoxide 

c. Air 

d. Methane 


Answer- Methane


Que- Submarines move under water. They have engines that run on 

a. Petrol and oxygen 

b. Diesel 

c. Batteries 

d. Steam 


Answer- Diesel


Que- Which is the highest quality of hard coal? 

a. Anthracite 

b. Bituminous 

c. Lignite 

d. Peat 


Answer- Anthracite


Que- The main source of Naphthalene is 

a. Charcoal 

b. Camphor 

c. Coal-tar 

d. Diesel 


Answer- Coal-tar


Que- In arc welding, Argon is used because of its 

a. Low reactivity with metal 

b. Ability to lower the melting point of the metal 

c. High flammability 

d. High calorific value 


Answer- Low reactivity with metal


Que- An inert gas mixed with oxygen given to patients suffering from restricted breathing is 

a. Helium 

b. Krypton 

c. Radon 

d. Argon 


Answer- Helium


Que- Which of the following elements is obtained from seaweeds ? 

a. Iodine 

b. Vanadium 

c. Argon 

d. Sulphur 


Answer- Iodine


Que- Silica gel is a 

a. Moisturizer 

b. Flavouring agent 

c. Drying agent 

d. Delicious food 


Answer- Drying agent


Que- Silicon is a 

a. Semiconductor 

b. Insulator 

c. Non-conductor 

d. Conductor 


Answer- Semiconductor


Que- The degree of dissociation of an electrolyte depends on 

a. Dilution 

b. Impurities 

c. Atmospheric pressure 

d. Method of dissolution 


Answer- Dilution


Que- In the electroplating of gold, the electrolyte used is 

a. Gold chloride 

b. Gold nitrate 

c. Gold sulphate 

d. Potassium aurocyanide 


Answer- Gold sulphate


Que- The deterioration of a metal by an electrochemical process is commonly termed as 

a. Erosion 

b. Corrosion 

c. Passivation 

d. Abrasion 


Answer- Corrosion


Que- Aqueous solution of which of the following is a good conductor of electricity 

a. Ammonium acetate 

b. Glucose 

c. Ammonia 

d. Acetic acid 


Answer- Ammonium acetate


Que- The cathode of a lead storage battery is made up of 

a. Zinc 

b. Lead 

c. Lead oxide 

d. Manganese dioxide 


Answer- Lead


Que- Oxide of sulphur present in the atmosphere are washed down by rains to cause : 

a. Depletion of fossil fuel reserves 

b. Eutrophication in lakes 

c. Lowering of pH of soil 

d. Industrial smog formation 


Answer- Depletion of fossil fuel reserves


Que- Supersonic jet causes pollution by thinning of 

a. O3 layer 

b. O4 layer 

c. SO2 layer 

d. CO2 layer 


Answer- O3 layer


Que- The pollutant responsible for ozone holes is ________ 

a. CO2 

b. SO2 

c. CO 

d. CFC 


Answer- CFC


Que- Major gaseous pollutant of the thermal power station is 

a. H2 S 

b. NH3 

c. NO2 

d. SO2 


Answer- SO2


Que- The gas causing acid rain in an industrial area is 

a. Carbon dioxide 

b. Carbon monoxide 

c. Sulphur dioxide 

d. Methane 


Answer- Sulphur dioxide


Que- Sea water can be purified by the process of 

a. Distillation 

b. Evaporation 

c. Filtration 

d. Fractional distillation 


Answer- Distillation


Que- A mixture of water and alcohol can be separated by 

a. Filtration 

b. Evaporation 

c. Decantation 

d. Distillation 


Answer- Distillation


Que- Which one is a naturally occuring noble gas? 

a. Sodium 

b. Potassium 

c. Argon 

d. Boron 


Answer- Argon

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