Question

1)The chemical change involving iron and hydrochloric acid illustrates a ___recation. 2)In the type of reaction called ___ two compound exchanger positive and negative radical.3) A catalyst either ___ or ____the rate of a chemical change but itself remains___at the end of a recation.
4) Onheating,hydrated copper sulphate changes its colour from___to___.​

Answer 1

Answer:

displacement

double displacement

increases, decrease,inert

Blue, colourless

Explanation:

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Answer 2

Answer:

displacement

double displacement

increse, decrease, inert

blue, colourless