Chemistry MCQ (Multiple Choice Questions) - SchoolingAxis

Chemistry MCQ (Multiple Choice Questions)

 Que- Which of the following can be found as pollutants in the drinking water in some parts of India? Select the correct answer using the code given below.(A) Arsenic (B) Sorbitol (C) Fluoride (D) Formaldehyde (E) Uranium 

a. B, D and E 

b. A, B, C, D and E 

c. A, C and E 

d. A and C 


Answer- A, C and E


Que- Smog is 

a. Nothing but black smoke 

b. A combination of smoke and fog 

c. A liquid particle resulting from vapour condensation 

d. A solid particle, e.g., fllyash 


Answer- A combination of smoke and fog


Que- Asbestos is formed of : 

a. Calcium and Magnesium 

b. Copper, Zinc and Manganese 

c. Lead and Iron 

d. Calcium and Zinc 


Answer- Calcium and Magnesium


Que- Bayer's reagent is 

a. Alkaline potassium permanganate 

b. Acidified potassium permanganate 

c. Hydrogen peroxide 

d. Bromine water 


Answer- Alkaline potassium permanganate


Que- Bone ash contains 

a. Calcium sulphate 

b. Phosphoric sulphate 

c. Calcium phosphate 

d. Calcium hypophosphate 


Answer- Calcium phosphate


Que- Cement is made hard with 

a. Dehydration 

b. Hydration and dissociation of water 

c. Dissociation of water 

d. Polymerisation 


Answer- Hydration and dissociation of water


Que- 'Plaster of Paris' is made by partial dehydration of 

a. Epsom salt 

b. Gypsum salt 

c. Blue vitriol 

d. Green vitriol 


Answer- Gypsum salt


Que- Chemical name of common salt is 

a. Sodium Chloride 

b. Sodium Bicarbonate 

c. Sodium 

d. Sodium Oxide 


Answer- Sodium Chloride


Que- Nitrogen forms a variety of compounds in all oxidation states ranging from 

a. –3 to +5 

b. –3 to +3 

c. –3 to +4 

d. –3 to +6 


Answer- –3 to +5


Que- What is the covalency of nitrogen in ammonia molecule 

a. 2 

b. 3 

c. 4 

d. 5 


Answer- 3


Que- What is 'milk of magnesia' chemically? 

a. Magnesium carbonate 

b. Sodium bicarbonate 

c. Calcium hydroxide 

d. Magnesium hydroxide 


Answer- Magnesium hydroxide


Que- Which one of the following is a micro-element ? 

a. Chlorine 

b. Hydrogen 

c. Nitrogen 

d. Oxygen 


Answer- Chlorine


Que- When lime juice is dropped on baking soda, brisk effervescence takes place because the gas evolved is 

a. Hydrogen 

b. Oxygen 

c. Carbon dioxide 

d. All of them 


Answer- Carbon dioxide


Que- Which of the following is used as filler in tyre of rubber ? 

a. Carbon black 

b. Coal 

c. Coke 

d. Graphite 


Answer- Carbon black


Que- The open ""Sigrees"" or coal stoves often require fanning to sustain burning because of 

a. Tendency of carbon dioxide to form a layer along with dust smoke 

b. Lack of oxygen in the surroundings of sigrees 

c. Accumulation of smoke and dust over the sigrees 

d. Interrupted release of moisture from the material 


Answer- Tendency of carbon dioxide to form a layer along with dust smoke


Que- 24 carat of diamond is equal to 

a. 200 mg 

b. 200 g 

c. 95% mg 

d. 91% gold 


Answer- 200 mg


Que- 1 carat of diamond is equal to 

a. 200 mg 

b. 200 g 

c. 100 mg 

d. 100 g 


Answer- 200 mg


Que- The metal ion present in Vitamin B12 is 

a. Nickel 

b. Cobalt 

c. Iron 

d. Zinc 


Answer- Cobalt


Que- The metal present in vitamin B12 is 

a. Fe 

b. Co 

c. Mg 

d. Mo 


Answer- Co


Que- Which of the following is not present in RNA 

a. Thymine 

b. Uracil 

c. Ribose 

d. Phosphate 


Answer- Thymine


Que- The enzyme that converts glucose to ethyl alcohol is : 

a. Invertase 

b. Maltase 

c. Zymase 

d. Diastase 


Answer- Zymase


Que- The fat of a common mussel-secretes a sticky glue that can be used to make heart implants. The unique chemical compound present in the glue is: 

a. Amino phenyl alanine 

b. Hydroxy phenyl alanine 

c. Phenyl alanine 

d. Dihydroxy phenyl alanine 


Answer- Dihydroxy phenyl alanine


Que- Freon used as refrigerant is chemically 

a. Chlorinated hydrocarbon 

b. Fluorinated hydrocarbon 

c. Chlorofluoro hydrocarbon 

d. Fluorinated aromatic compound 


Answer- Chlorofluoro hydrocarbon


Que- The gas used for artificial fruit ripening of green fruit is 

a. Ethylene 

b. Acetylene 

c. Ethane 

d. Methane 


Answer- Ethylene


Que- Which one of the following vegetable oils is used in the manufacture of paints? 

a. Palm oil 

b. Sunflower oil 

c. Linseed oil 

d. Cottonseed oil 


Answer- Linseed oil


Que- KMnO4 can be used as 

a. Insecticide 

b. Fertilizer 

c. Pesticide 

d. Disinfectant 


Answer- Disinfectant


Que- A detergent is a 

a. Cleansing agent 

b. Drug 

c. Catalyst 

d. Soap 


Answer- Cleansing agent


Que- Oxygen has (+) oxidation number only in 

a. OF2 

b. C12O 

c. H2O (2) 

d. N2O 


Answer- OF2


Que- The oxidation number of nickel in K4[Ni(CN)4] is 

a. Zero 

b. +4 

c. –4 

d. +8 


Answer- Zero


Que- How many neutrons are there in 92U238 atom ? 

a. 92 

b. 238 

c. 146 

d. 330 


Answer- 146


Que- The number of neutrons present in an element having mass number 226 and atomic number 88 is : 

a. 88 

b. 138 

c. 314 

d. 50 


Answer- 138


Que- Who modified Bohr's theory by introducing elliptical orbits for electron path? 

a. Hund 

b. Thomson 

c. Rutherford 

d. Sommerfeld 


Answer- Sommerfeld


Que- Which of the following is the petroleum wax ? 

a. Bees wax 

b. Carnauba wax 

c. Paraffin wax 

d. Jojoba wax 


Answer- Paraffin wax


Que- The hottest part of the gas flame is known as 

a. Blue zone 

b. Non-luminous zone 

c. Luminous zone 

d. Dark zone 


Answer- Luminous zone


Que- Water is not effective in extinguishing a fire caused by petrol because 

a. The flame is too hot for water to cool it down 

b. Water and petrol react chemically 

c. Water and petrol are miscible with each other 

d. Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn 


Answer- Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn


Que- The temperature of oxy-acetylene flame is around 

a. 2800°C 

b. 3200°C 

c. 3600°C 

d. 4000°C 


Answer- 4000°C


Que- Helium gas is used in gas balloons instead of hydrogen gas because it is 

a. Lighter than hydrogen 

b. More abundant than hydrogen 

c. Non-combustible 

d. More stable 


Answer- Non-combustible


Que- Which acid is used in Lead storage battery? 

a. Sulphuric acid 

b. Nitric acid 

c. Hydrochloric acid 

d. Acetic acid 


Answer- Sulphuric acid


Que- The acid used in lead storage cells is 

a. Phosphoric acid 

b. Hydrochloric acid 

c. Nitric acid 

d. Sulphuric acid 


Answer- Sulphuric acid


Que- The acid used in lead storage cells is 

a. Phosphoric acid 

b. Hydrochloric acid 

c. Nitric acid 

d. Sulphuric acid 


Answer- Sulphuric acid


Que- Milk tastes sour when it is left in open for some time. This happens due to the formation of 

a. Lactic acid 

b. Citric acid 

c. Acetic acid 

d. Carbonic acid 


Answer- Lactic acid


Que- The compound used in prickly heat powder to prevent excessive sweating is 

a. Boric acid 

b. Phosphoric acid 

c. Carbonic acid 

d. Sulphuric acid 


Answer- Boric acid


Que- The constituents of automobile exhaust that can cause cancer is/are : 

a. Oxides of nitrogen 

b. Carbon monoxide 

c. Polycyclic hydrocarbons 

d. Lead 


Answer- Lead


Que- The acid rain destroys vegetations because it contains 

a. Nitric acid 

b. Ozone 

c. Carbon monoxide 

d. Sulphuric acid 


Answer- Sulphuric acid


Que- Of the following, which one pollutes the air of a big city ? 

a. Copper 

b. Chromium 

c. Lead 

d. Cadmium 


Answer- Lead


Que- Of the following which one pollutes the air of a big city ? 

a. Copper 

b. Chromium 

c. Lead 

d. Calcium 


Answer- Lead


Que- Which of the following is usually not an air-pollutant? 

a. Hydrocarbons 

b. Sulphur dioxide 

c. Carbon dioxide 

d. Nitrous oxide 


Answer- Nitrous oxide


Que- The function of skimming tank in sewage treatment is to remove 

a. Oil and fatty substances 

b. Suspended solids 

c. Gritty substances 

d. Inorganic substances 


Answer- Oil and fatty substances


Que- Acid rain is caused due to emission of which of the following into the atmosphere ? 

a. Oxides of nitrogen and sulphur 

b. Carbon dioxide and carbon monoxide 

c. Ozone and carbon dioxide 

d. Carbon monoxide and nitrogen 


Answer- Oxides of nitrogen and sulphur


Que- The depletion of Ozone layer is mainly due to 

a. Volcanic eruptions 

b. Aviation fuels 

c. Radioactive rays 

d. Chlorofluorocarbons 


Answer- Chlorofluorocarbons


Que- Chemical name of vinegar is 

a. Acetone 

b. Acetic acid 

c. Formaldehyde 

d. Ethanol 


Answer- Acetic acid


Que- Which one of the following organic compounds has fruity smell? 

a. Alcohol 

b. Aldehyde 

c. Ester 

d. Ether 


Answer- Ester


Que- The Latin word formica means ant. The name formic acid is derived from this Latin word because 

a. this acid, in ancient times, was used to eliminate ant-hills 

b. this corrosive acid is secreted by ants to drive away their enemies 

c. this acid was first obtained by the distillation of ants 

d. ants are attracted by the odour of this acid 


Answer- this acid was first obtained by the distillation of ants


Que- The ore which is found in abundance in India is 

a. monazite 

b. fluorspar 

c. bauxite 

d. magnetite 


Answer- monazite


Que- The inherited traits of an organism are controlled by 

a. RNA molecules 

b. nucleotides 

c. DNA molecules 

d. enzymes 


Answer- DNA molecules


Que- The heat energy produced when the human body metabolises 1 gram of fat is 

a. 30 KJ 

b. 1 KJ 

c. 39 KJ 

d. 29 KJ 


Answer- 39 KJ


Que- What are the number of moles of CO2 which contains 16 g of oxygen? 

a. 0.5 mole 

b. 0.2 mole 

c. 0.4 mole 

d. 0.25 mole 


Answer- 0.5 mole


Que- Which type of fire extinguisher is used for petroleum fire ? 

a. Foam type 

b. Soda acid type 

c. Powder type 

d. None of these 


Answer- Foam type


Que- Man dies in the atmosphere of CO, because it 

a. Dries up the blood 

b. Combines with O2 present in the body 

c. Reduces the organic matter of tissues 

d. Combines with the haemoglobin of blood, thereby making the later incapable of absorbing O2 


Answer- Combines with the haemoglobin of blood, thereby making the later incapable of absorbing O2


Que- It is dangerous to leave the car engine running in a closed garage, because it may cause serious pollution due to poisoning by emission of 

a. CO2 

b. CO 

c. Unburnt petrol 

d. SO2 


Answer- CO


Que- Which gas is used as fire extinguisher ? 

a. Carbon dioxide 

b. Carbon monoxide 

c. Carbon suboxide 

d. Sulphur dioxide 


Answer- Carbon dioxide


Que- The process which does not evolve CO2 in air is 

a. Burning 

b. Breathing 

c. Organic delay 

d. Photosynthesis 


Answer- Photosynthesis


Que- Galvanization is the : 

a. Deposition of zinc on iron 

b. Deposition of tin on iron 

c. Deposition of copper on iron 

d. Deposition of aluminium on iron 


Answer- Deposition of zinc on iron


Que- Which one of the following metals is used to galvanise iron ? 

a. Copper 

b. Lead 

c. Zinc 

d. Mercury 


Answer- Zinc


Que- A non-electronic conductor is 

a. Iron 

b. Gas Carbon 

c. Copper Sulphate 

d. None of these 


Answer- None of these


Que- The anode of a dry cell is made up of 

a. Iron 

b. Cadmium 

c. Zinc 

d. Lead 


Answer- Zinc


Que- The coating of a thin layer of zinc on steel or iron objects is known as 

a. Hot dipping 

b. Tinning 

c. Galvanising 

d. Electroplating 


Answer- Galvanising


Que- Element 106 was discovered by 

a. Rutherford 

b. Seaborg 

c. Lawrence 

d. Kurchatove 


Answer- Seaborg


Que- The gas used for filling weather balloons is 

a. Helium 

b. Hydrogen 

c. Air 

d. Nitrogen 


Answer- Helium


Que- The most abundant element is 

a. Calcium 

b. Silicon 

c. Oxygen 

d. Nitrogen 


Answer- Oxygen


Que- A balloon filled with helium rises in air because 

a. Air exerts an upward force on the balloon 

b. The balloon is weightless 

c. Helium is less dense than air 

d. Helium pushes down on the air below the balloon 


Answer- Helium is less dense than air


Que- Which one of the following is also known as solution ? 

a. A compound 

b. A homogeneous mixture 

c. A heterogeneous mixture 

d. A suspension 


Answer- A homogeneous mixture


Que- A powerful eye irritant present in smog is 

a. Nitric oxide 

b. Sulphur dioxide 

c. Peroxyacetyl nitrate 

d. Carbon dioxide 


Answer- Peroxyacetyl nitrate


Que- Which of the following is not a natural source of air pollution ? 

a. Volcanic eruptions and lightening discharge 

b. Biological decay of vegetable matter 

c. Photochemical oxidation of organic number 

d. None of the above 


Answer- None of the above


Que- CNG used in automobiles to check pollution, mainly consists of 

a. CH4 

b. CO2 

c. N2 

d. H2 


Answer- CH4


Que- What are the major pollutants of cigarette smoke? 

a. Carbon monoxide and dioxin 

b. Carbon monoxide and nicotine 

c. Carbon monoxide and benzene 

d. Dioxin and benzene 


Answer- Carbon monoxide and nicotine


Que- Which of the following metals is not a pollutant ? 

a. Mercury 

b. Arsenic 

c. Lead 

d. Aluminium 


Answer- Aluminium


Que- The first metal used by a man was 

a. Copper 

b. Silver 

c. Bronze 

d. Brass 


Answer- Copper


Que- White phosphorus is generally kept under 

a. Alcohol 

b. Water 

c. Glycerine 

d. Kerosene oil 


Answer- Water


Que- Which metal is extracted from sea water? 

a. Potassium 

b. Magnesium 

c. Aluminium 

d. Beryllium 


Answer- Magnesium


Que- The rusting of iron is a/an 

a. Physical change 

b. Electrochemical change 

c. Electrical change 

d. None of the above 


Answer- Electrochemical change


Que- When iron rusts, its weight 

a. Decreases 

b. Increases 

c. Remains the same 

d. First increases and then decreases 


Answer- Increases


Que- Highly toxic gas which causes headache, visual difficulty, paralysis and even death is 

a. CO2 

b. O3 

c. CO 

d. All of these 


Answer- CO


Que- Water gas is the combination of 

a. CO and H2 

b. CO2and H2 

c. CO and H2O 

d. CO2 and CO 


Answer- CO and H2


Que- The gas that causes suffocation and death when coal or coke is burnt in a closed room is 

a. Methane 

b. Ethane 

c. Carbon monoxide 

d. Carbon dioxide 


Answer- Carbon monoxide


Que- Which one is not a pure form of carbon? 

a. Coal 

b. Graphite 

c. Diamond 

d. Gold 


Answer- Gold


Que- Which one is the purest form of carbon? 

a. Coal 

b. Graphite 

c. Diamond 

d. Iron 


Answer- Diamond


Que- For a spontaneous chemical process, the free energy change is 

a. Positive 

b. Negative 

c. Zero 

d. Depends on whether the reaction is exothermic or endothermic 


Answer- Negative


Que- When a bond is formed between two atoms, the energy of the system will 

a. Increase 

b. Decrease 

c. Remain the same 

d. May increase or decrease 


Answer- Remain the same


Que- The minimum energy required for an effective collision is 

a. Threshold energy 

b. Activation energy 

c. Free energy 

d. Internal energy 


Answer- Activation energy


Que- Which of the following produces highest amount of energy upon oxidation? 

a. Protein 

b. Fat 

c. Glucose 

d. An alkane 


Answer- Fat


Que- Which of the following has least negative electron gain enthalpy? 

a. P 

b. S 

c. Cl 

d. F 


Answer- P


Que- The increasing abundance of green house gases in atmosphere has led to the following effect except 

a. Global warming 

b. Depletion of ozone layer in the stratosphere 

c. Oxygen fertilization effect 

d. Carbon dioxide ferilization effect 


Answer- Oxygen fertilization effect


Que- The source of energy that causes the least global warming is 

a. Coal 

b. Geothermal energy 

c. Natural Gas 

d. Petroleum 


Answer- Geothermal energy


Que- Which of the following fuels causes minimum environmental pollution? 

a. Diesel 

b. Kerosene 

c. Hydrogen 

d. Coal 


Answer- Hydrogen


Que- Biofertilizers convert nitrogen to ________ . 

a. Nitrates 

b. Ammonia 

c. Nitrogenase 

d. Amino acids 


Answer- Ammonia


Que- The elements in the modern Periodic table are arranged according to their 

a. Mass number 

b. Neutron number 

c. Atomic number 

d. Atomic Weight 


Answer- Atomic number


Que- The chemical name of quartz is 

a. Calcium oxide 

b. Calcium phosphate 

c. Sodium phosphate 

d. Sodium silicate 


Answer- Sodium silicate


Que- What is the most common salt in sea water ? 

a. Calcium carbonate 

b. Potassium chloride 

c. Sodium chloride 

d. Magnesium sulphate 


Answer- Sodium chloride


Que- Fertiliser having high nitrogen content is : 

a. Urea 

b. Ammonium sulphate 

c. Ammonium nitrate 

d. Calcium citrate 


Answer- Ammonium nitrate


Que- Which one of the following is found in kidney stones? 

a. Sodium oxalate 

b. Calcium oxalate 

c. Sodium chloride 

d. Calcium acetate 


Answer- Calcium oxalate


Que- Which one of the following is not present in cement ? 

a. Clay 

b. Alumina 

c. Alum 

d. Gypsum 


Answer- Alum

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