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prelims GK > chemistry > Flashcards

chemistry Flashcards

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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
In vulcanisation process, rubber can be hardened by adding. :-
Sulphur
25
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?
1865
26
Milk of magnesia is an/
Magnesium hydroxide [Mg(OH)2]
27
The carbon-based substance used in modern day pencils is
is :- Graphite [#R-5, TCS]
28
The constituents of automobile exhaust that can cause cancer or mental disease and pollutes the air of a big city?
Lead
29
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:
Condensation
30
Washing soda is chemically called as
Sodium carbonate
31
What is the chemical name of Plaster of Paris
Calcium Sulphate Hemihydrate (CaS04)1/2(H20)
32
Which acid is found in spinach?
Oxalic acid
33
Which theory was published by John Dalton in 1808 to explain chemical reactions
Atomic theory
34
are sweet smelling substance used in making perfumes.
Esters
35
is a reagent which can dissolve noble metals, gold and platinum
Aqua regia
36
is process in which natural rubber is treated with sulphur to make it more durable and elastic
Vulcanisation
37
is used as moderator in atomic reactor.
:- Graphite
38
is used to remove ink and rust stains on cloth?
Oxalic acid
39
‘Plaster of Paris’ is made by partial dehydration (heating) of.
Gypsum salt
40
At room temperature, the metal that remains liquid
Mercury
41
Bleaching powder is prepared by passing
Chlorine over slaked lime
42
Cinnabar (HgS) is an ore/mineral of which metal
Mercury
43
Elements having same atomic numbers / Protons but different mass number / Neutrons but showing similar chemical properties are called
Isotopes
44
German silver
silver-white alloy of copper, zinc, and nickel. It's also known as nickel silver, argentan, new silver, nickel brass, albata, or alpacca.
45
The highest volume of gases in lower atmosphere is comprised of
Nitrogen
46
Liquefied petroleum gas (LPG) used for cooking in homes is a combination of:
propane and butane
46
Nucleus of an atom consists of
Proton and Neutron
47
Glass is a.
supercooled liquid
48
The major component in the LPG (Liquefied Petroleum Gas) is.
Butane
49
The reaction between an acid and a base is known as
Neutralization
49
50
Two elements which are used to absorb neutrons to control the chain reaction during nuclear fission are
Boron and Cadmium
51
What is the chemical formula of washing soda?
Na2CO310H20
51
Which element is used to make the coils used in water heaters?
Nichrome
52
Which metal is found in Free state in nature and was first metal to be used by man?
Copper
52
‘White phosphorus is always kept under.
water
53
is considered to be the fifth state of matter.
Bose-Einstein condensate
54
is most reactive metal and kept in kerosene.
Sodium
54
Noble gas
naturally occurring members of group 18 of the periodic table: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon
55
is not radio-active.
Zirconium
55
is used as a sowing agent in the preparation of soft drinks.
Phosphoric acid [
55
caused radioactive pollution along the coast of Kerala.
Thorium
55
Acid changes the colour of blue litmus to
RED
55
Among iron ores, the highest percentage of iron content is found in
Hematite
55
Aspirin is common name of
Acetyl Salicylic Acid
55
Blue Vitriol is another name for____
Copper Sulphate (Cuso4)
55
Bronze is an alloy of.
Copper and Tin
55
Chaoite, Buckminsterfullerene and Graphene are allotrope of which element?
Carbon
56
Hardest allotrope of carbon in which all carbon atoms are quaternary in nature is.
Diamond
56
Heavy water is
Deuterium Oxide (D,0)
57
Heavy water is used as a coolant in nuclear reactors. Heavy water is.
water containing heavy isotope of hydrogen
58
Helium is added to the oxygen supply of deep sea divers because it is.
less soluble in blood than nitrogen at high pressure
59
Identify the element that is most prolific in the crust of the earth.
Oxygen
60
In a molecule of water, the ratio of the mass of hydrogen to that of oxygen is:
1:8
61
Isobars are defined as:
Atoms of different elements having the same mass number but different atomic numbers
62
Limestone, chalk and marble are different forms of
calcium carbonate [
63
Natural rubber s a polymer of.
Isoprene
64
Nitrification is the biological process of converting
Ammonia into nitrite
65
On the pH scale, we can measure pH from 0 (very acidic) to (very alkaline).
14
66
Oxides of metals are generally
basic
67
Oxides of non-metals are generally ,
acidic
68
Sea weeds are important source of
Todine
69
Setting of Plaster of Paris involves,
hydration to form other hydrates
70
Solder metal is an alloy of.
lead and tin
71
Tear gas used by the police to disperse the mob contains, ___________
Chlorine (Chloropicrin)
72
The chemical substance present in bones (Bone ash) and teeth is.
Calcium phosphate
73
The element used for making solar cells is.
silicon
74
The gas used for artificial fruit ripening of green fruit is
Ethylene
75
The gas used in the welding and cutting of metals and artificial ripening of fruits is
Acetylene
76
The main source of Naphthalene is.
Coal-tar
77
The molecular formula of common salt (Sodium Chlo- ride) is
NaCl
78
The most commonly used chemicals in the artificial rainmaking or cloud seeding are_
Silver Iodide (Agl)
79
The pH of pure water (H,0) is ____________ at 25 degree Cel- sius.
7
80
The phenomenon of change of liquid into vapours at any temperature below its boiling point is called:
Evaporation
81
Water gas is the combination of
CO and H2
82
What is the more common name for solid carbon diox ide?
Dry Ice
83
What is the pH value of human blood
7.4
84
Which compound has the chemical formula CHCl, whose melting point is 209 K?
Chloroform
85
Which elements/chemical compounds has the highest density?
Osmium

prelims GK (12 decks)

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