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ncert science Flashcards

1
Q

which compund is use in cement

A

calcium oxide

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2
Q

anode produce

A

oxygen

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3
Q

cathode prodice

A

hydrogen

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4
Q

silver chl turn grey

A

in sunlight and form silver metal

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5
Q

why surface of copper powder coated with black

A

oxygen is added

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6
Q

if hydrogen pass through heated material

A

then blac colour turn brown

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7
Q

lichen belong to

A

thallophytes

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8
Q

acid and base give which ion after dissolvingin water

A

H+ and OH-

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9
Q

which su b use in photography to remove agr

A

sodium thisolphate

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10
Q

wgich is use in fire extenguisher

A

baking soda

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11
Q

process of dissolving an acid or base in water is

A

exothermic

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12
Q

acid plus base

A

salt plus water

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13
Q

tooth decay start when our ph become less than

A

5.5

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14
Q

nature of tooth paste is

A

basic

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15
Q

enamel made up of

A

calcium sulphate

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16
Q

most ductile metal

A

gold

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17
Q

metal plus oxygen

A

metal oxide

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18
Q

metal plus water

A

metal oxide and hydrogen

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19
Q

metal plus acid

A

slat and hydrogen

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20
Q

acid rain ph

A

if its ph below 5.6

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21
Q

those base soluble in wtaer are called

A

alkalene

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22
Q

phenepthalon in base

A

pink

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23
Q

aqua regia

A

3 mole of hcl and 1 mole of hno3

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24
Q

foolish gold

A

pyrite

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25
Q

titanium ore

A

ilemenite

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26
Q

casertile

A

tin ore

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27
Q

caranalite is aore of

A

potassium

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28
Q

rocksalt borax is ore of

A

sodium

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29
Q

Lithium, along with sodium and potassium, is an alkali metal that is stored in oil (or kerosene) primarily due to its

A

reactivity

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30
Q

Carbonate and sulfide ores are commonly converted into

A

oxides

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31
Q

galvanization

A

involves applying a coating of zinc

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32
Q

single bond

A

saturated fat

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33
Q

polyatomic ion

A

cluster of atom that act as ion are called

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34
Q

jj thomson got nobel prize for

A

discovery of electrons

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35
Q

in ruthrford mose he find

A

alpha rays

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36
Q

neils bohr got atomic prize for

A

structure of Atom

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37
Q

electron distribution by

A

neils bohr

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38
Q

3 and 5 valency

A

phospohrous

39
Q

rutherford alpha particle scattering experminet led to

A

discovery of atomic nucleus

40
Q

protein factory

41
Q

absorption of water by plant root is

A

example of osmosis

42
Q

nucleus has single layer or double layer covering

43
Q

plastids found only in

44
Q

sucida l bag

45
Q

galileo enrolled for

A

medical degree

46
Q

the lliteel ebalance book

47
Q

sound waves are longitudnal or transverse waves

A

longitudnal

48
Q

peptic ulcer caused by

A

helicobactwer pylori

49
Q

acne cause

A

staphylocii

50
Q

india japan joint moon

51
Q

chandrayan 3

A

surfaced on southern pole of moon

52
Q

earthcare mission

A

eu and jaxaa for aerosol

53
Q

calcium oxide react with vigorously with water to produce

A

slake lime(calcium hydroxie) and releasing large amount of heat

54
Q

which is use for washing wall

A

slaked lime

55
Q

slake lime (calcium hydroxide) produce what on board

A

calcium carbonate

56
Q

lime stone heat

A

quick lime

57
Q

rod in electrolysis

58
Q

anode produce

59
Q

reaction of zinc granule with sulphuric acid release

60
Q

lime water and co2

A

white precipitite

61
Q

acid on venus

A

sulphuric acid

62
Q

mouth enamel is made up of

A

calcium hydroxapatite

63
Q

nettle contain

A

methonic acid

64
Q

treatment of nettle bite

A

rubbing dock plant

65
Q

acid +base

A

salt and water

66
Q

if magnesium burn in the air then what will happen

A

dazzling white flame

67
Q

metal +water

A

metal oxide+hydrogen

68
Q

metal oxide + water

A

metal hydroxide

69
Q

metal +acid

A

salt and hydrogen

70
Q

nobel gas in which group

71
Q

does nobel gas has high valency

72
Q

metal extraction from electrolysis

A

kaun nache cham mai all

73
Q

extraction of metal from remove carbon

A

zara fir position pe

74
Q

stainless steel

A

nickel and chromium

75
Q

highest melting and boiling point of carbon compound

A

acetic acid

76
Q

lowest melting and boiling point of carbon

77
Q

nobel gas

A

: Noble gases are termed “inert” because they rarely participate in chemical reactions. Their filled outer electron shells make them stable and unlikely to gain or lose electrons1

78
Q

graphite

A

3 layered covalent bond

79
Q

catenation

A

carbon unique ability to form bond with other atoms of atoms

80
Q

valency of carbon

81
Q

ethane

82
Q

mathane

83
Q

propane

84
Q

ethanoic acid known as

A

acetic acid

85
Q

carboxylic acid

A

acetic acid

86
Q

how ester form

A

by reaction of acid and alcohaol ethanoic acid and alcohal

87
Q

ethanoic acid reaction with hydrocarbon

A

to giverise to salt co2 and water

88
Q

hydropholic soap react

A

react with water

89
Q

does tail of soap is soluble

90
Q

detergent are sodium saltof

A

sulphuric ac8d

91
Q

which is remain effective in hard water

A

calcium and mg

92
Q

butanone is

93
Q

ketone feature

94
Q

how many covalent bond ethane has

Gs (83 decks)

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