Chemistry MCQ - Metals and Non-metals

61 Magnesium ribbon is rubbed with sand paper before making it to burn. The reason of rubbing the ribbon is to (NTSE Stage-II, 2015-16)

A
Remove moisture condensed over the surface of ribbon
B
Generate heat due to exothermic reaction
C
Remove magnesium oxide formed over the surface of magnesium
D
Mix silicon from and (silicon dioxide with magnesium for lowering ignition temperature of the ribbon

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62 The element that cannot be used as a reducing agent is (NTSE Stage-II, 2015-16)

A
Carbon
B
Aluminium
C
Sulphur
D
Sodium

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63 Which statement is correct in the following?

A
All metals are tensile.
B
All non-metals are tensile.
C
Generally metals are tensile.
D
Some non-metals are tensile.

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Comment

All metals are tensile. The term tensile strength refers to the amount of tensile (stretching) stress a material can withstand before breaking or failing. The ultimate tensile strength of a material is calculated by dividing the area of the material tested (the cross-section) by the stress placed on the material, generally expressed in terms of pounds or tons per square inch of material.