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

CDS Chemistry

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


13.
Which of the following alkali metals can be cut easily with an ordinary knife due to its extreme softness?
A.
Magnesium
B.
Sodium
C.
Iron
D.
Copper
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ANSWER :
B. Sodium
14.
'Tensile strength' of a metal refers to its ability to:
A.
Withstand a stretching force without breaking
B.
Produce a ringing sound
C.
Conduct electric current
D.
Reflect light from its surface
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ANSWER :
A. Withstand a stretching force without breaking
15.
Most metals have comparatively high melting and boiling points. Which of these metals is a notable exception with a low melting point?
A.
Iron
B.
Gallium
C.
Platinum
D.
Copper
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ANSWER :
B. Gallium
16.
Why is sodium metal kept immersed in kerosene oil for storage?
A.
To prevent it from melting at room temperature
B.
To increase its overall weight
C.
To improve its metallic lustre permanently
D.
To prevent its reaction with oxygen and moisture in air
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ANSWER :
D. To prevent its reaction with oxygen and moisture in air
17.
When sodium metal burns in air, it primarily forms:
A.
Sodium oxide
B.
Sodium carbide
C.
Sodium nitride
D.
Sodium hydride
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ANSWER :
A. Sodium oxide
18.
Which protective oxide layer forms on the surface of aluminium, preventing it from further corrosion?
A.
Aluminium hydroxide
B.
Aluminium carbide
C.
Aluminium nitride
D.
Aluminium oxide
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ANSWER :
D. Aluminium oxide