Question

1. Complete the following statements,
(a) The chemical change involving iron and hydrochloric
acid illustrates a .............. reaction.
(b) In the type of reaction called ...
two compounds exchange their positive and negative
radicals.
(c) A catalyst either ............. or ............. the rate of a
chemical change but itself remains ............. at the end
of the reaction.
(d) On heating, hydrated copper sulphate changes its colour
from .............. to............
​

Answer 1

Answer:

1. Negative
2. radicals...

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