General Science Chemistry MCQs

1 . Which of the following gas causes an explosion in coal mines?

[A] Carbon dioxide
[B] Nitrogen
[C] Butane
[D] Methane

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Correct Answer: D [Methane]

2. Sweat contains water and:

[A] Citric acid
[B] Lactic acid
[C] Salt
[D] Vinegar

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Correct Answer: C [Salt]

3 . The antiparticle of an electron is:

[A] Positron
[B] Proton
[C] Alpha particles
[D] Beta particles

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Correct Answer: A [Positron]

4 . The deterioration of a metal by an electrochemical process is commonly termed as:

[A] Erosion
[B] Corrosion
[C] Passivation
[D] Abrasion

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Correct Answer: B [Corrosion]

5 . Which of the following is the common name of Phosgene?

[A] Carbonyl chloride
[B] Phosphine
[C] Carbon tetrachloride
[D] Phosphorus trichloride

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Correct Answer: A [Carbonyl chloride]

6 . Aluminium salt commonly used to stop bleeding is:

[A] Aluminium nitrate
[B] Aluminium sulphate
[C] Aluminium Chloride
[D] Potash alum

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Correct Answer: B [Aluminium sulphate]

7 . Browning of paper in old books is caused by:

[A] Frequent use
[B] lack of aeration
[C] Collection of dust
[D] Oxidation of cellulose

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Correct Answer: D [oxidation of cellulose]

8 . Which of the following is not a property of a metal?

[A] Hardness
[B] Lustrous
[C] Malleability
[D] Poor conductivity of heat

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Correct Answer: D [Poor conductivity of heat]

9 . Which among the following acids is used in Lead storage batteries?

[A] Acetic acid
[B] Hydrochloric acid
[C] Sulphuric acid
[D] Nitric acid

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Correct Answer: C [Sulphuric acid]

10 The most abundant metal in the Earth’s crust is:

[A] zinc
[B] copper
[C] aluminium
[D] iron

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Correct Answer: C [aluminium]

11.What is used in storage batteries?

[A] Copper
[B] Tin
[C] Lead
[D] Zinc

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Correct Answer: C [Lead]

12.What is formed when Magnesium is burnt?

[A] Baking Soda
[B] Calcium Carbonate
[C] Ash
[D] Vinegar

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Correct Answer: C [Ash]

13.The process of depositing a layer of any desired metal on another material by means of electricity is called:

[A] Electroplating
[B] Galvanisation
[C] Rusting
[D] Crystallisation

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Correct Answer: A [Electroplating]

14.Which is not an inorganic gas?

[A] Ammonia
[B] Hydrogen sulphide
[C] Methane
[D] Carbon monoxide

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Correct Answer: C [Methane]

15.In Modern Periodic Table, the atomic radius increases:

[A] while moving from left to right in a period
[B] while moving from right to left in a period
[C] while moving from top to bottom in a group
[D] none of the above

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Correct Answer: B [while moving from right to left in a period]

16.Which one of the following non-metals is a good conductor of electricity?

[A] Sulphur
[B] Graphite
[C] Phosphorus
[D] Coal

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Correct Answer: B [Graphite]

17.The constituents of automobile exhaust that can cause cancer is/are:

[A] Oxides of nitrogen
[B] Carbon monoxide
[C] Polycyclic hydrocarbons
[D] Lead

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Correct Answer: D [Lead]

18.Sulphur dioxide level in the atmosphere can be reduced by using:

[A] more efficient car engines
[B] catalytic converters in industry
[C] static electricity to attract it in factory chimneys
[D] low sulphur fuels

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Correct Answer: D [low sulphur fuels]

19.The alkoloid naturally found in coffee, cocoa and cola nut is:

[A] Cocaine
[B] Morphine
[C] Tannin
[D] Caffeine

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Correct Answer: D [Caffeine]

20.The gas produced in marshy places due to decomposition of vegetation is:

[A] Carbon monoxide
[B] Carbon dioxide
[C] Sulphur dioxide
[D] Methane

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Correct Answer: D [Methane]

21 .Propanol belongs to which of the following group?

[A] Alcohol
[B] Aldehyde
[C] Carboxylic acid
[D] Ketone

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Correct Answer: A [Alcohol]

22.Which of the following metals is commonly used to increase the strength of steel alloys?

[A] Bismuth
[B] Boron
[C] Tin
[D] Molybdenum

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Correct Answer: D [Molybdenum]

23.Which of these is the only metal that is liquid at ordinary room temperature and pressure?

[A] Copper
[B] Zinc
[C] Mercury
[D] Beryllium

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Correct Answer: C [Mercury]

24.Which of these chemicals is used to dissolve the soap to make a transparent soap?

[A] Ethanoic acid
[B] Ethanol
[C] Benzene
[D] Propylene

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Correct Answer: B [Ethanol]

25.Which of these chemicals is used as a water softening agent?

[A] Baking soda
[B] Washing soda
[C] Bleaching powder
[D] Slaked lime

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Correct Answer: B [Washing soda]

26.Which of the following would come in use to treat diseased skin surfaces?

[A] Analgesics
[B] Antiseptics
[C] Antihistamines
[D] None of the above

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Correct Answer: B [ Antiseptics]

27.Which of the following isotope of Hydrogen has only one neutron?

[A] Protium
[B] Deuterium
[C] Tritium
[D] None of them

28.Crystals of a compound changes its blue color to white on heating in a closed container. However, it regains blue color after sometime when allowed to cool down. This compound is of which of the following metals?

[A] Iron
[B] Cobalt
[C] Copper
[D] Zinc

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Correct Answer: C [Copper]

29.Who discovered electron?

[A] John Dalton
[B] James Chadwik
[C] Ernest Rutherford
[D] J J Thomson

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Correct Answer: D [J J Thomson]

30.Rutherford’s scattering experiment proved the presence of:

[A] atoms in all matter
[B] electrons in atoms
[C] neutrons in atoms
[D] nucleus in atoms

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Correct Answer: D [nucleus in atoms]

31.Which of the following is the correct order in terms of Iron content?

[A] Magnetite > Haematite >Siderite > Limonite
[B] Haematite> Magnetite >Siderite > Limonite
[C] Haematite > Magnetite > Limonite > Siderite
[D] Magnetite > Haematite > Limonite > Siderite

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Correct Answer: D [Magnetite > Haematite > Limonite > Siderite]

32.What do we call the region of space around the nucleus where the probability of finding an electron is maximum?

[A] Shell
[B] sub-shell
[C] Orbital
[D] electron cloud

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Correct Answer: C [Orbital]

33.Which of the following characteristic of an electron is impossible to determine simultaneously, as per Heisenberg’s Uncertainty Principle?

[A] exact charge and exact velocity
[B] exact charge and exact mass
[C] exact position and exact momentum
[D] exact mass and exact position

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Correct Answer: C [exact position and exact momentum]

34.Which of the following orbital will be filled first among two orbitals?

[A] Orbital with higher value of (n+l)
[B] Orbital with lower value of (n+l)
[C] Orbital with lower value of (n)
[D] Orbital with lower value of (l)

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Correct Answer: B [Orbital with lower value of (n+l)]

35.Choose the correct statement:

[A] John Dalton discovered Electrons
[B] James Chadwick discovered protons
[C] Rutherford calculated Charge to Mass ratio of electrons
[D] None of the above

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Correct Answer: D [None of the above]

36.Which of the following decays represents the decay of Uranium-238 to thorium-234?

[A] Alpha decay
[B] Beta decay
[C] Gamma decay
[D] None of the above

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Correct Answer: A [Alpha decay]

37.What is the order of the reaction which is independent of the concentration of reactants?

[A] Zero order
[B] First order
[C] Second order
[D] Third order

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Correct Answer: A [Zero order]

38.What is the period and group number of Silicon (Z=14) in the periodic table?

[A] 2nd Period, 4th Group number
[B] 2nd Period, 14th Group number
[C] 3rd Period, 4th Group number
[D] 3rd Period, 14th Group number

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Correct Answer: D [3rd Period, 14th Group number]

39.What is the general trend for first ionisation enthalpy in a group of the periodic table as we move from top to bottom?

[A] It increases
[B] it decreases
[C] It is constant
[D] None of the above

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Correct Answer: B [it decreases]

40.What is the length of O-O double bond in an ozone molecule?

[A] 121 pm
[B] 148 pm
[C] 143 pm
[D] 123 pm

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Correct Answer: A [121 pm]

41.Which among the following acids is abundant in Grapes, Bananas and Tamarind?

[A] Lactic Acid
[B] Oxalic Acid
[C] Salicylic Acid
[D] Tartaric Acid

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Correct Answer: D [Tartaric Acid ]

42 . 2,4-D, which is sold as a weed killer of the broad-leaved weeds is a synthetic version of __:

[A] Auxin Hormone
[B] Cytokinin Hormone
[C] Xylitol
[D] None of them

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Correct Answer: A [Auxin Hormone ]

43.Which compound of mercury is used as antiseptic?

[A] Mercuric sulphide
[B] Mercuric oxide
[C] Mercuric chloride
[D] Mercuric iodide

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Correct Answer: C [Mercuric chloride]

44.Kimberley Process” is related to which among the following ?

[A] Gold
[B] Diamonds
[C] Semi Precious Stones
[D] Aluminium

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Correct Answer: B [Diamonds]

45.Which among the following is produced when we pass chlorine into slaked lime?

[A] DDT
[B] Baking Powder
[C] Bleaching Powder
[D] Gypsum

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Correct Answer: C [ Bleaching Powder]

46.What is the equilibrium distance for Hydrogen atoms?

[A] 0.54 Å
[B] 0.64 Å
[C] 0.74 Å
[D] 0.84 Å

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Correct Answer: C [0.74 Å]

47.Which of the following is correct about HCl gas?

[A] It is a colourless and pungent smelling gas
[B] It is extremely soluble in water
[C] Both a and b
[D] None

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Correct Answer: C [Both a and b]

48.What do we call the compounds having identical molecular formula but different structures?

[A] Functional isomers
[B] Structural isomers
[C] Mirror isomers
[D] Branched isomers

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Correct Answer: B [Structural isomers]

49.If we take 1 kg of iron and let it rust, and none of the rust falls off, then the total weight will be___?

[A] Less than 1 Kg
[B] More than 1 Kg
[C] Exact 1 Kg
[D] More or Less than 1 Kg

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Correct Answer: B [More than 1 Kg]

50.Which of the following metal is alloyed with pure gold to make gold ornaments?

[A] Silver
[B] Copper
[C] Zinc
[D] All of the above

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Correct Answer: D [All of the above]

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General Science Chemistry MCQs

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