the following chemicals are available in solid form in a laboratory to study
combination reaction
decomposition reaction
double displacement reaction
part b
state the chemicals that can be used in solid forms 2) aqueos solution to study the above reactions.
calcium oxide,ferrous sulphate, barium chloride, sodium sulphate

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Solution

(a) Combination reaction
CaO (s) + H₂O (l) → Ca(OH)₂ (aq)

Decomposition reaction
FeSO₄.7H₂O (s) $\overset{h e a t}{\to}$ FeSO₄+ 7H₂O
Green White
2FeSO₄(s) $\overset{h e a t}{\to}$ Fe₂O₃ + SO₂ + SO₃
Brown

Double decomposition reaction
BaCl₂ (aq) + Na₂SO₄ (aq) → BaSO₄(s) + 2NaCl(aq)

(b) (i) CaO and ferrous sulphate ate in solid state.
(ii) Barium chloride and sodium sulphate are used in aqueous state.

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