Question

give one example each:
(a) change in state
(b) change in color
(c) change in temperature
(d) evolution of gas

Answer 1

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Answer 2

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Evolution of gas-:
Zn +H2SO4 >> ZnSO4 + H2

Change in Color ::
CuSo4+ Fe>> FeSO4 +Cu

Change in temperature -:
when zn granules reacts with hydrochloric acid its endothermic

Change in state
burning of wax in order to form co2

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