Chemistry (2017) | Study Mode

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Question 2
A
Co 
B
Mn 
C
Al 
D
Mg 
Explanation.
Share Answer Constituents of duralumin are: Al, Cu, Mg, Mn.
Constituents of Alnico are: Al, Ni and Co

In 1909, the alloy of duralumin was discovered by Alfred Wilon consisting of 94% Al, 4% Cu, 1% Mg and 1% Mn(Manganese)
Alnico is an acronym referring to a family of iron alloys which in addition to iron are composed primarily of Al, Ni and Co.

Correct Option:
C
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Question 4
A
dye 
B
dispersant 
C
salt 
D
mordant 
Explanation.
Share Answer Aluminium hydroxide is used in the dyeing industry as a mordant. It combines with a dye and thereby fixes it in a material.

Correct Option:
D
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Question 5
A
ethanol 
B
bromine chloride 
C
chlorine water 
D
water 
Explanation.
Share Answer It is also called weak iodine solution. Tincture solutions are characterized by the presence of alcohol.

Correct Option:
A
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Question 6
A

CaCO3

 
B

Na2CO3

 
C

Na2SO4

 
D

CaSO4

 
Explanation.
Share Answer

Permanent hardness in water= Mg & Ca Sulphate.
Temporary hardness in water= Mg & Ca Carbonate.

Temporary hardness of water is caused by Magnesium and calcium hydrogencarbonate. It is formed when rainwater containing dissolved CO2 flows over deposit of CaCO3

i.e CaCO3 + CO2 + H2O Ca(HCO3)2


Correct Option:
A
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Question 7
A

SO3

 
B

NO2

 
C

SO2

 
D

CO2

 
Explanation.
Share Answer

H2CO3 is an example of a weak acid while H2SO4 and HNO3 are examples of a strong acid.

CO2 combines with water to give a weak trioxocarbonate (IV) acid.

CO2 + H2O H2CO3


Correct Option:
D
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Question 8
A
Isotopy 
B
Resonance 
C
Isomerism 
D
Reforming 
Explanation.
Share Answer Resonance involves two forms of a compound.
Isomerism involves two or more forms of an element.
Reforming involves the rearrangement of molecule.

This deals with a two forms of a molecule where the chemical connectivity is the same but the electrons are distributed differently around the structure.

Correct Option:
B
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Question 9
A
an hydrous CaCl4 
B
concentrated NaCO4 
C
dilute NaOH 
D
concentrated H4SO4 
Explanation.
Share Answer This is used in the preparation of ethyl ethanoate to remove the water present since it serves as a dehydrated agent.

Correct Option:
D
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Question 10
A
O2 and H2
B
Ar and CO2 
C
CO2 and H2
D
O2 and CO2 
Explanation.
Share Answer The constituent of air includes O2, CO2, N2 and Noble gases. While for a rusting process to take place, the presence of O2, H2O and CO2 is important.

The constituent of air includes O2, CO2, N2 and Noble gases and for rusting process to take place.

The presence of O2 and CO2 as a constituent of air is indispensable

Correct Option:
D
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