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Question 13 : A substance which ionises to produce hydroxide ions is called __________. Base Salt None of the above Acid Question 14 : A chief source of benzene and its derivatives is __________. Bitumen Limestone Coaltar Basalt Question 15 : A chief source of benzene and its derivatives is __________. Bitumen Basalt Coaltar Limestone Question 16 : A functional group that introduces polarity leads to __________ in the molecule. increase saturation point Permanent dipole moment increase melting point increase boiling point
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