Chemistry (2018) | Study Mode

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Question 21
A

carbon - 14

B

Phosphorus - 32

C

Cobalt - 60

D

Iodine - 131

Explanation

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Correct option: C
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Question 22
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 23
A

EmFnGpHq

B

EFGH

C

GpHqEmFn

D

GHEF

Explanation

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Correct option: C
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Question 24
A
basic properties of ammonia
B
acidic properties of ammonia
C
reducing properties of ammonia
D
oxidizing properties of ammonia
Explanation

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Correct option: C
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Question 25
A
Na2SO4
B
Na2SO3
C
Na2S
D
Na2CO3
Explanation

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Correct option: B
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Question 26
A
carbon (IV) oxide
B
carbon (II) oxide
C
soda
D
glucose
Explanation

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Correct option: A
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Question 27
A
i, ii and iii
B
i, ii and iv
C
i and ii only
D
i and iv.
Explanation

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Correct option: A
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Question 28
A
conservation of mass
B
definite proportions
C
multiple proportions
D
conservation of energy
Explanation

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Correct option: A
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Question 29
A
0.89 mol
B
1.90 mol
C
3.80 mol
D
5.70 mol
Explanation

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Correct option: A
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Question 30
A
0C
B
-100C
C
-273C
D
-373C
Explanation

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Correct option: C

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