Chemistry Test

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Chemistry Test - 57

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Weekly Quiz Competition

Question 1
1 / -0

Temporary hardness is due to the presence of

A
Calcium carbonate

B
calcium bicarbonate

C
magnesium sulphate

D
calcium sulphate

Solution

Temporary hardness is due to the presence of soluble bicarbonates of calcium and magnesium in water. Permanent hardness is due to the presence of sulphates and chlorides of calcium and magnesium.
Question 2
1 / -0

In known elements, the maximum number is of

A
Metals

B
Non Metals

C
Metalloids

D
None of these

Solution

In known elements, the maximum number is of Metals.
Question 3
1 / -0

Ethanol is converted into ethoxy ethane,

A
by heating excess of ethanol with conc. H2SO4 at 140°C

B
by treating with conc. H2SO4 at room temperature

C
by treating with conc. H2SO4 at 273 K

D
by heating Ethanol with excess of conc. H2SO4 at 443 K

Solution

Ethanol is converted into ethoxy ethaneby heating excess of ethanol with conc. H2SO4 at 140°C.
Question 4
1 / -0

Which is the gas used for making vegetables and vanaspathi from vegetable oils?

A
Hydrogen

B
Nitrogen

C
Argon

D
Helium

Solution

Hydrogen gas is used for making vegetables and vanaspathi from vegetable oils.

As it is colourless, odourless, tasteless, flammable gaseous substance, it is added to oils to make them more solid or spreadable.

The use of hydrogenation helps to prolong the shelf life of the food and maintain flavour stability.
Question 5
1 / -0

Brass gets discoloured in air because of the presence of which of the following gases in air ?

A
Hydrogen sulphide

B
Oxygen

C
Nitrogen

D
Carbon dioxide

Solution

Brass gets discoloured in air because of the presence of Hydrogen sulphide gases in air.
Question 6
1 / -0

The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10 dm³ at 27°C is to a volume of 100 dm^3.

A
42.3 J/ mole / K

B
38.3 J/ mole / K

C
35.8 J/ mole / K

D
32.3 J/ mole / K

Solution
Question 7
1 / -0

The difference between a nuclear reactor and atomic bomb is that ___________

A
no chain reaction takes place in nuclear reactor while in the atomic bomb there is a chain reaction

B
the chain reaction in nuclear reactor is controlled

C
the chain reaction in nuclear reactor is not controlled

D
no-chain reaction takes place in atomic bomb while it takes place in nuclear reactor

Solution

The difference between a nuclear reactor and atomic bomb is that the chain reaction in nuclear reactor is controlled.
Question 8
1 / -0

The metal which reacts most violently with with cold water is

A
calcium

B
sodium

C
magnesium

D
potassium

Solution

Potassium reacts violently with water liberating hydrogen. The reaction is so violent that the liberated hydrogen catches fire.
Question 9
1 / -0

In a face centred cubic lattice, atom A occupies the corner positions and atom B occupies the face centre positions. If one atom of B is missing from one of the face centred points, the formula of the compound is

1) A₂B₅

2) A₃B₂

3) A₂B₃

4) A₃B₄

A
Option 1

B
Option 2

C
Option 3

D
Option 4

Solution

Z_A= 8/8 ; Z_B = 5/2

So formula of compound is AB_5/2

i.e., A₂B₅.
Question 10
1 / -0

Which one of the following is not a mixture

A
air

B
mercury

C
milk

D
cement

Solution

Mercury is not a mixture.

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Re-Attempt Weekly Quiz Competition

Chemistry Test - 57

Result

Chemistry Test - 57

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SHARING IS CARING

Question 1

Calcium carbonate

calcium bicarbonate

magnesium sulphate

calcium sulphate

Solution

Question 2

Metals

Non Metals

Metalloids

None of these

Solution

Question 3

by heating excess of ethanol with conc. H2SO4 at 140°C

by treating with conc. H2SO4 at room temperature

by treating with conc. H2SO4 at 273 K

by heating Ethanol with excess of conc. H2SO4 at 443 K

Solution

Question 4

Hydrogen

Nitrogen

Argon

Helium

Solution

Question 5

Hydrogen sulphide

Oxygen

Nitrogen

Carbon dioxide

Solution

Question 6

42.3 J/ mole / K

38.3 J/ mole / K

35.8 J/ mole / K

32.3 J/ mole / K

Solution

Question 7

no chain reaction takes place in nuclear reactor while in the atomic bomb there is a chain reaction

the chain reaction in nuclear reactor is controlled

the chain reaction in nuclear reactor is not controlled

no-chain reaction takes place in atomic bomb while it takes place in nuclear reactor

Solution

Question 8

calcium

sodium

magnesium

potassium

Solution

Question 9

Option 1

Option 2

Option 3

Option 4

Solution

Question 10

air

mercury

milk

cement

Solution

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