Question

Which of the following reaction represent a combination reaction?
(I) CaCO3=CaO+CO2 (ii) Zn +H2O=ZnSO4+Cu
(iii) CaO+H2O=CA(OH)2
(iv) 2Na+H2O=2NaOH+H2

Answer 1

Answer:iii is answer

Explanation:because two or more compounds react and form only one compound called combination reaction

Answer 2

Explanation:

iii) is a direct combination reaction or synthesis reaction

CaO +H2O=CA(OH)2

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