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16. The reddish brittle coating formed on iron especially when chemically alldheu Dy MUIST
air and composed essentially of hydrated ferric oxide. Is called
a corrosion
C. rust
b. iron
d. metal

17 Who among the following proposed/created the nuclear atom model?
a. J.J. Thomson
c. Hans Geiger
b. Ernest Rutherford
d. James Chadwick

18. The 'gold foil' experiment conducted by Hans Geiger and Ernest Marsden with positively
charged alpha particles by Rutherford leads to the following result, with the exception that;
Most alpha particles passed through the gold foil suggesting that an atom
is largely empty space.
b Some alpha particles were deflected significantly suggesting that the positive
charge of an atom must be concentrated in a very small sphere.
c. A very small number of alpha particles actually bounced back.
d More beta particles are deflected in the fluorescent.

19. Atoms with the same number of protons but different in number of neutrons are called
a. electron
b. ions c. isotopes
d. proton

20 What is the charge of Aluminum ion?
a. +1
b. +2
C. +3
d. +4

21 Which of the following materials will undergo corrosion?
a. iron nail
c. plastic bottle
b. wood
d. cement

22 What do you call the 2 rows of elements placed below the main part of the periodic table?
a. lanthanide and nonmetals
b. actinide and alkali metals
c. lanthanide and actinide series
d inert gases

23 The following are the effective ways of preventing corrosion, except;
a. Use a coating or barrier product such as grease, oil, paint or carbon fiber
coating
b Keep air and moisture away from the metal by covering the metal. This is
done by painting, plastic coating, greasing, chromium plating, zinc plating
or galvanizing and tin plating.
c. Fix small pieces of a more reactive metal to its surface.
d Expose the metals to air and acidic substance​