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15 May, 01:33

11 Which substance can not be broken down by a chemical change?

(1) ammonia (3) ethane

(2) arsenic (4) propanal

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Answers (1)
  1. 15 May, 01:55
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    (2) Arsenic. It is an element and elements are chemically the simplest units and cannot be broken down by any chemical change.
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