Chemistry (UI) | Study Mode

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Question 21
A
0.64 [B
B
5.73
C
1.56
D
0.7
E
0.54
Explanation

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Correct option: A
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Question 22
A
atomic weights
B
isotopic weights
C
molecular weights
D
atomic numbers
Explanation

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Correct option: D
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Question 23
A
radioisotope
B
radioactivity
C
dating
D
transmutation
E
nuclear reaction.
Explanation

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Correct option: D
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Question 24
A
bent, linear and tetrahedral
B
bent, tetrahedral and linear
C
tetrahedral, linear and bent
D
linear, bent and tetrahedral
Explanation

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Correct option: D
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Question 25
A
H2O
B
H2
C
KCl
D
NH3
E
HF.
Explanation

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Correct option: C
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Question 26
A
hydrogen bonding
B
covalent bonding
C
ionic bonding
D
metallic bonding
E
van-der- waals bonding.
Explanation

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Correct option: B
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Question 27
A
Adding iron filings to aerated water
B
Adding sodium metal to water
C
Cooling a solution of iron(II) sulphate to obtain the hydrated salt
D
Cooling water to obtain ice
Explanation

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Correct option: D
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Question 28
A
it gives offensive taste
B
excess calcium is precipitated
C
it encourages the growth of bacteria
D
it attacks lead contained in pipes
Explanation

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Correct option: D
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Question 29
A
non-polar
B
polar
C
reactive
D
basic
E
acidic
Explanation

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Correct option: B
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Question 30
A
ascorbic acid and citric acid
B
citric acid and ascetic acid
C
citric acid and dilute HCl
D
citric acid and salicyclic acid
E
Sulphuric acid
Explanation

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Correct option: A

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