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prelims GK > chemistry > Flashcards

chemistry Flashcards

1
Q

The chemical name of the acid present in vinegar is
called

A

Acetic acid

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2
Q

The chemical name of baking soda is:

A

sodium hydrogen carbonate (NaHCO3)

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3
Q

The major constituent of Gobar gas / Bio gas / Natural
gas is

A

Methane

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4
Q

What is deposited on iron in the process of galvanization?

A

Zinc

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5
Q

What are the components responsible for acid rain

A

Sulphur dioxide (SO2) and Nitrogen oxides (NOx)

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5
Q

The chemical name of “laughing gas” is

A

Nitrous oxide (N2O]

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6
Q

Aqua regia is a freshly prepared mixture of concentrated
hydrochloric acid and concentrated nitric acid in
the ratio of by volume

A

3:1

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7
Q

Iron is prevented from rusting by coating with zinc.
This process is called as

A

Galvanisation

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8
Q

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

A

Helium

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9
Q

What is the common name of Calcium Hypochlorite
(CaOCL2) , used extensively for sterilizing water?

A

Bleaching powder

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10
Q

Which acid is found in ant’s sting

A

Formic acid

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11
Q

Sour milk /curd contains

A

Lactic acid

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12
Q

The acid used in lead storage cells (traditional battery)
is.

A

Sulphuric acid

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13
Q

The gas involved in Bhopal incident was

A

Methyl isocyanate

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14
Q

What is the principal ore of aluminium

A

Bauxite

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15
Q

An alloy with _______ in it is referred to as ‘amalgam’.

A

Mercury (Hg)

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16
Q

Brass is an alloy of:

A

Copper and Zinc

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17
Q

The chemical name of ‘Common/table salt’ found
abundantly in seawater is

A

Sodium chloride

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18
Q

The most abundant inert gas in the atmosphere
used in electric bulb and has lowest electron affinity
is.

A

Argon

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19
Q

The Radloacuve element which is commonly used in
nuclear for producing electricity by nuclear fission is

A

Uranium

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20
Q

Which gas in its solid state is also known as dry ice

A

Carbon Dioxide

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21
Q

Which gas is used as fire extinguisher

A

Carbon Dioxide

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22
Q

A change of state directly from solid to gas without
changing into liquid state (or vice versa) is called
]

A

:- Sublimation

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23
Q

Highest percentage of carbon and lowest percentage
of volatile material is found in which form of
coal?

A

Anthracite

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24
Q

In vulcanisation process, rubber can be hardened by
adding. :-

A

Sulphur

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25
Q

In which year did John Alexander Newlands propound
a new concept of the Law of Octaves’ proposing the
periodicity of chemical elements arranged in order of
atomic weight?

A

1865

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26
Q

Milk of magnesia is an/

A

Magnesium hydroxide [Mg(OH)2]

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27
Q

The carbon-based substance used in modern day pencils
is

A

is :- Graphite [#R-5, TCS]

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28
Q

The constituents of automobile exhaust that can cause
cancer or mental disease and pollutes the air of a big
city?

A

Lead

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29
Q

The process of transformation of a substance in a gaseous
state into a liquid state due to change in pressure
or temperature of the substance is called:

A

Condensation

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30
Q

Washing soda is chemically called as

A

Sodium carbonate

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31
Q

What is the chemical name of Plaster of Paris

A

Calcium Sulphate Hemihydrate (CaS04)1/2(H20)

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32
Q

Which acid is found in spinach?

A

Oxalic acid

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33
Q

Which theory was published by John Dalton in 1808
to explain chemical reactions

A

Atomic theory

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34
Q

are sweet smelling substance used in making
perfumes.

A

Esters

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35
Q

is a reagent which can dissolve noble metals,
gold and platinum

A

Aqua regia

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36
Q

is process in which natural rubber is treated
with sulphur to make it more durable and elastic

A

Vulcanisation

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37
Q

is used as moderator in atomic reactor.

A

:- Graphite

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38
Q

is used to remove ink and rust stains on cloth?

A

Oxalic acid

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39
Q

‘Plaster of Paris’ is made by partial dehydration (heating)
of.

A

Gypsum salt

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40
Q

At room temperature, the metal that remains liquid

A

Mercury

41
Q

Bleaching powder is prepared by passing

A

Chlorine over slaked lime

42
Q

Cinnabar (HgS) is an ore/mineral of which metal

A

Mercury

43
Q

Elements having same atomic numbers / Protons but
different mass number / Neutrons but showing similar
chemical properties are called

A

Isotopes

44
Q

German silver

A

silver-white alloy of copper, zinc, and nickel. It’s also known as nickel silver, argentan, new silver, nickel brass, albata, or alpacca.

45
Q

The highest volume of gases in lower atmosphere is
comprised of

A

Nitrogen

46
Q

Liquefied petroleum gas (LPG) used for cooking in
homes is a combination of:

A

propane and butane

46
Q

Nucleus of an atom consists of

A

Proton and Neutron

47
Q

Glass is a.

A

supercooled liquid

48
Q

The major component in the LPG (Liquefied Petroleum
Gas) is.

A

Butane

49
Q

The reaction between an acid and a base is known as

A

Neutralization

49
Q
A
50
Q

Two elements which are used to absorb neutrons to
control the chain reaction during nuclear fission are

A

Boron and Cadmium

51
Q

What is the chemical formula of washing soda?

A

Na2CO310H20

51
Q

Which element is used to make the coils used in water
heaters?

A

Nichrome

52
Q

Which metal is found in Free state in nature and was first
metal to be used by man?

A

Copper

52
Q

‘White phosphorus is always kept under.

A

water

53
Q

is considered to be the fifth state of matter.

A

Bose-Einstein condensate

54
Q

is most reactive metal and kept in kerosene.

A

Sodium

54
Q

Noble gas

A

naturally occurring members of group 18 of the periodic table: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon

55
Q

is not radio-active.

A

Zirconium

55
Q

is used as a sowing agent in the preparation of
soft drinks.

A

Phosphoric acid [

55
Q

caused radioactive pollution along the coast of Kerala.

A

Thorium

55
Q

Acid changes the colour of blue litmus to

A

RED

55
Q

Among iron ores, the highest percentage of iron content is found in

A

Hematite

55
Q

Aspirin is common name of

A

Acetyl Salicylic Acid

55
Q

Blue Vitriol is another name for____

A

Copper Sulphate (Cuso4)

55
Q

Bronze is an alloy of.

A

Copper and Tin

55
Q

Chaoite, Buckminsterfullerene and Graphene are allotrope of which element?

A

Carbon

56
Q

Hardest allotrope of carbon in which all carbon atoms are quaternary in nature is.

A

Diamond

56
Q

Heavy water is

A

Deuterium Oxide (D,0)

57
Q

Heavy water is used as a coolant in nuclear reactors. Heavy water is.

A

water containing heavy isotope of hydrogen

58
Q

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

A

less soluble in blood than nitrogen at high pressure

59
Q

Identify the element that is most prolific in the crust of
the earth.

A

Oxygen

60
Q

In a molecule of water, the ratio of the mass of hydrogen to that of oxygen is:

A

1:8

61
Q

Isobars are defined as:

A

Atoms of different elements having the same
mass number but different atomic numbers

62
Q

Limestone, chalk and marble are different forms of

A

calcium carbonate [

63
Q

Natural rubber s a polymer of.

A

Isoprene

64
Q

Nitrification is the biological process of converting

A

Ammonia into nitrite

65
Q

On the pH scale, we can measure pH from 0 (very acidic) to (very alkaline).

A

14

66
Q

Oxides of metals are generally

A

basic

67
Q

Oxides of non-metals are generally ,

A

acidic

68
Q

Sea weeds are important source of

A

Todine

69
Q

Setting of Plaster of Paris involves,

A

hydration to form other hydrates

70
Q

Solder metal is an alloy of.

A

lead and tin

71
Q

Tear gas used by the police to disperse the mob contains, ___________

A

Chlorine (Chloropicrin)

72
Q

The chemical substance present in bones (Bone ash)
and teeth is.

A

Calcium phosphate

73
Q

The element used for making solar cells is.

A

silicon

74
Q

The gas used for artificial fruit ripening of green fruit is

A

Ethylene

75
Q

The gas used in the welding and cutting of metals and artificial ripening of fruits is

A

Acetylene

76
Q

The main source of Naphthalene is.

A

Coal-tar

77
Q

The molecular formula of common salt (Sodium Chlo- ride) is

A

NaCl

78
Q

The most commonly used chemicals in the artificial
rainmaking or cloud seeding are_

A

Silver Iodide (Agl)

79
Q

The pH of pure water (H,0) is ____________ at 25 degree Cel- sius.

A

7

80
Q

The phenomenon of change of liquid into vapours at any temperature below its boiling point is called:

A

Evaporation

81
Q

Water gas is the combination of

A

CO and H2

82
Q

What is the more common name for solid carbon diox ide?

A

Dry Ice

83
Q

What is the pH value of human blood

A

7.4

84
Q

Which compound has the chemical formula CHCl, whose melting point is 209 K?

A

Chloroform

85
Q

Which elements/chemical compounds has the highest density?

A

Osmium

prelims GK (12 decks)

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