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11 Which substance can not be broken down by a chemical change? (1) ammonia (3) ethane (2) arsenic (4) propanal
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11 Which substance can not be broken down by a chemical change?

(1) ammonia (3) ethane
(2) arsenic (4) propanal

User Dan Becker
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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.
User Uttam Panchasara
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