1) On heating copper sulphate what color is formed a) black b) brown c) green d) blue 2) Most metal sulphates decompose when they are heated to metal oxide and which gas? a) CO2 b) O2 c) SO2 d) SO3 3) The oxygen (O2) evolves by heating which compound? a) NaNO3 b) CuSO4 c) CuCO3 d) Cu(OH)2 4) the metal which cant replace the hydrogen of the acid is: a) aluminum b) zinc c) copper d) sodium 5) From the following metals, the most active one in the chemical activity series is: a) copper b) sodium c) hydrogen d) aluminum 6) Double substitution reactions between two salt solutions are accompanied by formation of a) a metal b) a precipitate c) an oxide d) a nonmetal 7) When there is a sudden decrease in the car speed, the sodium azid is decomposed into which gas? a) N2 b) H2 c) O2 d) CO2

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