The red or Orange coating that forms on the surface of iron when exposed to air and moisture for some time is called
A) galvanization
B) electroplating
C) rust
D) reduction
Correct Answer:
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Q7: A metal, which melts on the palm
A)potassium
B)sodium
C)gallium
D)zinc
Q8: A lustrous non-metal is
A)diamond
B)iodine
C)sulphur
D)phosphorus
Q9: Sodium is a
A)silvery white and very soft
Q10: Which of the following is used for
Q11: What should be added to pure iron
Q13: The tip of the lead pencil is
Q14: The most abundant element in the sun's
Q15: Ordinary glass is a mixture of
A)sodium silicate,
Q16: Glass used for making wind screens of
Q17: Annealing is done to
A)increase brittleness
B)increase Transparency
C)decrease brittleness
D)increase
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