Answer:
(i)
(a) Benzoic acid begin to melt at 20 min. (1)
(b) Benzoic acid begin to boil at 52 min. (1)
(ii) The melting point of benzoic acid is 120° C.
(1)
(iii) The temperature remains constant at 120 ° C untill
all the benzoic acid has melted. (1)
(iv) The physical state of benzoic acid is liquid during
the time interval of 35-45 min. (1)
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