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Cds Journey > Chemistry > Flashcards

Chemistry Flashcards

1
Q

When magnesium ribbon burns in air, it burns in which colour

A

White flame

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2
Q

Saturated compounds like lpg , burns with which flame

A

Blue flame

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3
Q

Unsaturated compounds burns with which flame

A

Yellow flame

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4
Q

Magnesium ribbon burns with a dazzling, white flame and changes into a white powder. It is formed due to the reaction between

A

Magnesium and oxygen

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5
Q

State true or false

when calcium oxide reacts with water it forms quicklime

A

False , it forms slaked lime

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6
Q

State true or false
when calcium oxide reacts with water. It forms slaked lime and it is an exothermic reaction and requires heat as a driving energy.

A

False , it releases heat

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7
Q

When the vegetable matter turns into compost which of the following reaction is or are involved?
1)Combination reaction
2)decomposition reaction
3)combination and exothermic reaction
4)decomposition and exothermic reaction

A

4

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8
Q

Which of the following is water gas?
a) CO+H2
b)CO+N2
c)CO+H2O
d)CO+NH3

A

a

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9
Q

Which of the following is solid
1)Fe2O3
2)SO2
3)SO3
4)CO2

A

1

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10
Q

When FeSO4 . 7H2O ( ferrous sulphate ) loses water
Then its colour turns from green to _______

A

White

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11
Q

FeSO4 (ferrous sulphate )with heat forms

A

Fe2O3(ferric oxide- reddish brown) +SO2+SO3
Here SO2 and SO3 are gases and ferric oxide solid

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12
Q

White silver chloride turns grey in sunlight. This is due to the _______ of silver chloride in to silver and chlorine by light.

A

Decomposition

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13
Q

Name the chemical used in black and white photography

A

Silver chloride and silver bromide

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14
Q

Ba(OH)2+NH4Cl —> BaCl2 +NH4OH is a endothermic reaction or exothermic reaction

A

Endothermic reaction

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15
Q

Why does the iron nail become brownish in colour and the blue colour of copper sulphate solution fades in a reaction between both?

A

Because of displacement reaction

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16
Q

Bose-Einstein condensate is a

A

fifth state of matter

The BEC is formed by working a gas of extremely low density, about one- hundred tons and the density of normal air to super low temperatures.

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17
Q

The rate of evaporation of liquid does not depend upon

A

its mass

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18
Q

Define isobars

A

Atoms of different elements with different atomic numbers, but same mass number

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19
Q

In graphite, each carbon atom is bonded to three other carbon atoms

A

in the same plane giving a hexagonal array

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20
Q

Employing chromatography, one cannot separate

A

radioisotopes

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21
Q

Define chromatography.

A

Chromatography is the technique for the separation of those solvents, that dissolve in the same solvent.
Radioisotopes cannot be dissolve in the same solvent to separate it.

22
Q

‘‘Atomic number of an element is a more fundamental property than its atomic mass.’’ Who among the following scientists has made the above statement?

A

Henry Moseley

23
Q

Very small insoluble particles in a liquid may be separated from it by using

A

decantation

24
Q

Fischer projection always depicts, the molecule in_______ form

A

eclipsed

25
Q

When hot water is placed into an empty water bottle, the bottle keeps its shape and does not soften. What type of plastic is the water bottle made from ?

A

Thermosetting

26
Q

Two reactants in a flask at room temperature are producing bubbles of a gas that turn limewater milky. The reactants could be

A

magnesium carbonate and
hydrochloric acid

27
Q

Which of the following characteristics is common to hydrogen, nitrogen, oxygen and carbon dioxide ?

A

H2, N2, O2 andCO2 are all gases at room temperature.

28
Q

____ are saturated hydrocarbons

A

Alkanes

29
Q

Diamond v/s Graphite

A

Diamond is harder
Both have same percentage of carbon
Graphite is a better conductor
Diamond has different carbon-carbon distance in all directions

30
Q

Bright light is found to emit from photographer’s flashgun. Thus brightness is due to the presence of which one of the following noble gases?

A

Xenon

31
Q

Which of the following substances cause temporary hardness in water?

A

magnesium and calcium
hydrogen carbonates [Mg(HCO ) and 3
Ca(HCO3)]2

It can be removed by boiling and Clark’s method.

32
Q

Which one of the following elements is used as a timekeeper in atomic clocks ?

A

Caesium

33
Q

______ dissolve in water to form acidic solution.

A

Carbon dioxide

34
Q

Pearl is a hard object produced within the soft tissues of a mollusk. Which one of the following is the main constituent of pearl?

A

The soft tissue of mollusc animal accumulateCaCO3 which makes the pearl in them

35
Q

The paste of a white material in water is used to maintain a fractured bone fixed in place. The white material used is called

A

Plaster of Paris

36
Q

Which one of the following types of glasses is used for making optical instruments?

A

Hard glass

37
Q

What are the main constituents of biogas?

A

Methane and carbon dioxide

38
Q

One carbon credit is accepted as equivalent to

A

1000 kg of carbon dioxide

Carbon credit is a generic term for any tradable certificate or permit representing the right to emit one tonne of carbon dioxide or the mass of another greenhouse gas with a carbon dioxide equivalent to one tonne of carbon dioxide.

39
Q

An emulsion consists of

A

two liquids

40
Q

Which one of the following radioactive substances enters/enter the human body through food chain and causes/ cause many physiological disorders ?

A

Strontium – 90

41
Q

Desalination of sea water is done by using reverse osmosis. The pressure applied to the solution is

A

larger than osmotic pressure

42
Q

Tincture of iodine is an antiseptic for fresh wounds. It is a dilute solution of elemental iodine, which contain

A

water
alcohol
potassium iodide
2-7% elemental iodine

43
Q

The pH value of a sample of
multiple-distilled water is

A

very near to 7

44
Q

The handle of pressure cookers is made of plastic because it should be made non-conductor of heat. The plastic used there is the first man-made plastic, which is

A

bakelite

45
Q

Methyl isocyanate gas, which was involved in the disaster in Bhopal in December, 1984, was used in the Union Carbide Factory for production of

A

pesticides

46
Q

What is German silver?

A

German silver is an alloy of copper, zinc and nickel. It is called so as it appears like silver.

47
Q

Hydrogen has three known isotopes namely_____

A

protium, deuterium and tritium.

48
Q

The synthetic rubber has replaced natural rubber for domestic and industrial purposes. Which one of the following is the main reason behind that?

A

Raw materials for synthetic rubber are easily available

49
Q

Red phosphorus is used in the manufacture of safety matches. This is due to the fact that

A

at ordinary temperature, it is less reactive than other varieties of phosphorus

50
Q
A

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