Chemistry | Study Mode

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Question 1
A

i and ii only

 
B

ii and iv only

 
C

iii and iv only

 
D

ii and iii only

 
Explanation.
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No official Explanation yet!


Correct Option:
B
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Question 2
A

234

 
B

136

 
C

106

 
D

233

 
Explanation.
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Calcium Hydrogen tetraoxosulphate (VI) = Ca(HSO4)2
= 40 + 2(1 + 32 + 4(16))
= 40 + 2(33 + 64)
= 40 + 2(97)
= 40 + 194
= 234gmol-1


Correct Option:
A
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Question 3
A

a decrease in electropositivity

 
B

an increase in chemical reactivity

 
C

a decrease in covalency in bond formation

 
D

an increase in the tendency to lose electrons

 
Explanation.
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It leads to an increase in chemical reactivity.


Correct Option:
B
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Question 4
A

sublimation

 
B

evaporation

 
C

distillation

 
D

Crystallization

 
Explanation.
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Sublimation involves change from solid to gas, by the action of heat.


Correct Option:
A
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Question 7
A

conduct heat and electricity

 
B

are malleable and ductile

 
C

have high melting and boiling point

 
D

are very reactive and unstable

 
Explanation.
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No official Explanation yet!


Correct Option:
D
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Question 8
A

Neutralization with NaOH followed by filtration

 
B

Neutralization with NaOH followed by distillation

 
C

Filtration followed by distillation

 
D

Fractional distillation

 
Explanation.
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Filtration followed by distillation can be used. The sand is filtered off while the methanoic acid is distilled off.


Correct Option:
C
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Question 9
A

higher the polarity of their inter atomic bond

 
B

higher the possibility of forming a molecule

 
C

weaker their interatomic bond

 
D

lower the polarity of their inter atomic bond

 
Explanation.
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Electronegativity difference is directly proportional to the polarity of a compound


Correct Option:
A
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Question 10
A

46

 
B

31

 
C

16

 
D

15

 
Explanation.
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Given:
Atomic number = 15
Mass number = 31
N.B: Atomic number = number of proton = 15
Mass number = number of proton + number of neutron
31 = 15 + number of neutron
number of neutron = 16
Since the question asks for the number of proton
np= 15


Correct Option:
D
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