Which of the following are decomposition reactions ? (i) 2KClO3 -> 2KCl + 3O2 (ii) MgO + H2O -> Mg(OH)2 (iii) 2H2O ->…

CBSE Class 10 Science PYQ · Chemical Reactions and Equations · Decomposition reactions · 1 Mark · March 2026 · Standard

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81 Mark · March 2026 · Standard
Which of the following are decomposition reactions ?
(i) $\ce{2KClO3 -> 2KCl + 3O2}$
(ii) $\ce{MgO + H2O -> Mg(OH)2}$
(iii) $\ce{2H2O -> H2 + O2}$
(iv) $\ce{Zn + CuSO4 -> ZnSO4 + Cu}$
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(C) / (i) and (iii) (1 Mark)
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