Chemistry | Study Mode

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Question 11
A

metali

B

covalent.

C

dative.

D

Ionic.

Explanation

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Correct option: D
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Question 12
A
nitrogen.
B
carbon(lV) oxide.
C
noble gases.
D
oxygen.
Explanation

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Correct option: A
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Question 13
A

white to red

B

blue to white.

C

blue to pink.

D

white to blue.

Explanation

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Correct option: C
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Question 14
A

CuO(s)

B

MgCl2(s)

C

CaCl2(s)

D

NaOH(s)

Explanation

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Correct option: A
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Question 15
A

581

B

0.581

C

5.810

D

58.100

Explanation

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Correct option: A
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Question 16
A
turpentine.
B
ammonia solution.
C
ethanol.
D
solution of borax in water
Explanation

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Correct option: B
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Question 17
A
a decrease in the temperature of the water which causes death of aquatic animals.
B
an increase in the number of aquatic animals in the water.
C
an increase in the bacterial population which reduces the level of oxygen in he water.
D
a decrease in the bacterial population which increases the level of oxygen in the water.
Explanation

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Correct option: C
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Question 18
A

0.4

B

0.8

C

2.0

D

0.5

Explanation

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Correct option: A
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Question 19
A
close to that of pure water.
B
less than 6.4
C
greater than 6.4
D
unaltere
Explanation

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Correct option: B
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Question 20
A
Aluminium oxide
B
Sodium hydrogentrioxosulphate(IV)
C
Sodium trioxocarbonate(IV)
D
Zinc chloride.
Explanation

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Correct option: A

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