Chemistry (2018) | Study Mode

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Question 31
A
FeS
B
CuS
C
ZnS
D
Na2S
Explanation

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Correct option: D
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Question 32
A
14
B
13
C
12
D
11
Explanation

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Correct option: D
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Question 33
A
coordinate
B
electrovalent
C
metallic
D
covalent.
Explanation

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Correct option: A
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Question 34
A
dissolution of salt in water
B
rusting of iron
C
melting of ice
D
separating a mixture by distillation
Explanation

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Correct option: B
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Question 35
A
298K
B
546K
C
819K
D
1092K
Explanation

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Correct option: D
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Question 36
A
decrease
B
increase
C
be zero
D
remain constant
Explanation

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Correct option: B
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Question 37
A
nitrogen
B
aluminium
C
copper
D
Sulphur
Explanation

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Correct option: D
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Question 38
A
HCl(g)
B
NH3
C
CI2
D
SO2
Explanation

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Correct option: B
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Question 39
A

are both metals

B

belong to the same group

C

belong to the same period

D

are positioned diagonally to each other

Explanation

At the beginning of periods 2 and 3 of the Periodic Table, there are several cases where an element at the top of one group has some similarities with an element in the next group.
For example, boron is a non-metal with some properties rather like silicon. Unlike the rest of Group 2, beryllium has some properties resembling aluminium. And lithium has some properties which differ from the other elements in Group 1, and in some ways resembles magnesium.

There is said to be a diagonal relationship between these elements.

There are several reasons for this, but each depends on the way atomic properties like electronegativity vary around the Periodic Table.


Correct option: D
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Question 40
A
CH
B
CH2
C
CH3
D
CnHn
Explanation

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: B

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