12. Multiple choise :
(a) Which of the following is not a characteristic of a
chemical change?
(i) It is irreversible
(ii) No net energy change is involved
(ii) New substance is formed
(iv) Involves absorbtion or liberation of energy
(b) A reaction of a type: AB+CD AD+CD. involves
(i) no chemical change
(ii) decomposition of AB and CD
(iii) exchange of ions of AB and CD
(iv) combination of AB and CD
(c) The reaction:
BaCl,(aq) +H,SO,(aq) +BaSO,(s) + 2HCl(aq) is
(i) displacement reaction
(ii) neutralisation reaction
(iii) decomposition reaction
(iv) double displacement reaction
(d) Thermal decomposition of sodium carbonate will
produce
(i) carbon dioxide (ii) oxygen
(iii) sodium hydroxide (iv) no other product
Answers
Answer:
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Explanation:
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