33. Normal valency of nitrogen is
A. 2
B. 3
C. 4
D. 5
34. The isotope atoms differ in
A. atomic number
B. number of protons
C. number of electrons
D. atomic weight
35. Nucleus of an atom contains
A. electrons
B. protons
C. electrons and protons
D. protons and neutrons
36. Which one of the following does not contain silver?
A. Horn silver
B. Ruby silver
C. German silver
D. Lunar caustic
37. Nail polish remover contains
A. acetone
B. benzene
C. acetic acid
D. petroleum ether
38. What is a mixture of potassium nitrate powdered charcoal and sulphur called?
A. paint
B. glass
C. gun powder
D. cement
39. Which is the heaviest metal?
A. iron
B. mercury
C. nickel
D. osmium
40. Bleaching action of chlorine is by
A. oxidation
B. reduction
C. decomposition
D. hydrolysis
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