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Polyamide
Polyester
Polyethylene
Polypropylene
Nylon threads are made of
Of the following which one pollutes the air of a big city ?
Of the following, which element is common to all acids
One of the constituents of tear gas is
One of the following is used to dissolve noble metals. That is
One property of ammonia is
Ordinary table salt is sodium chloride. What is baking soda?
Ornithophily refers to the pollination through which among the following?
Oxide of sulphur present in the atmosphere are washed down by rains to cause :
Oxygen has (+) oxidation number only in