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76 . A compound is a
A. pure substance
B. substance with varying boiling points
C. a substance with varying melting points
D. an impure substance due to various elements

77 . Smallest particle of a compound is
A. atom B. electrons
C. molecules D. all of these

78 . Smallest metal name in period table is Tin with a symbol of
A. Ti B. Fe
C. Tn D. Sn