Metals, Non-Metals, and Reactivity Order of Metals CDS Questions

CDS Chemistry

Metals, Non-Metals, and Reactivity Order of Metals MCQ Questions


7.

What is the formula of copper oxide ?

A.

CH2

B.

Cu2

C.

CuO

D.

Cl4

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ANSWER :

C. CuO

8.
__________ are insoluble in water but some of these dissolve in water to form alkalis.
A.
Metal Oxides
B.
Aluminium Oxide
C.
Sulphur Dioxide
D.
Hydrogen Oxide
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ANSWER :
A. Metal Oxides
9.
The protective _____________ prevents the metal from further oxidation.
A.
Oxygen Layer
B.
Oxide Layer
C.
Acid Layer
D.
Chlorine Layer
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ANSWER :
B. Oxide Layer
10.
What does not burn on heating but filings burn vigorously when sprinkled in the flame of the burner ?
A.
Silver
B.
Copper
C.
Zinc
D.
Iron
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ANSWER :
D. Iron
11.
Copper does not burn but the hot metal is coated with a black coloured layer of
A.
Aluminium Oxide
B.
Copper(II) Oxide
C.
Metal Oxides
D.
Oxide Layer
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ANSWER :
B. Copper(II) Oxide
12.
Which two do not react with oxygen even at high temperatures?
A.
Gold and Platinum
B.
Iron and Copper
C.
Copper and Zinc
D.
Silver and Gold
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ANSWER :
D. Silver and Gold