Question

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answers all the questions

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Answer 1

Q10 a

Q11 b

Q12 c

Q13 An exothermic reaction is a chemical reaction that releases energy through light or heat. It is the opposite of an endothermic reaction..

A combustion reaction is an example

Q14 a Reactivity of element decreases on moving from top to bottom in the given reactivity series.

b)88% copper and 12% tin bronze

Copper tin lead and zinc brass