Q. 204.6( 5 Votes )
Which of the following are combination reactions?
(i) 2KClO3 2KCl + 3O2
(ii) MgO + H2O → Mg(OH)2
(iii) 4Al + 3O2→ 2Al2O3
(iv) Zn + FeSO4→ ZnSO4 + Fe
A. (i) and (iii)
B. (iii) and (iv)
C. (ii) and (iv)
D. (ii) and (iii)
In reaction (ii), MgO + H2O → Mg(OH)2
MgO and water combined together to form a single product, i.e., magnesium hydroxide.
In reaction (iii), 4Al + 3O2→ 2Al2O3
Aluminium combines with oxygen to form a single product. i.e., aluminum oxide
Hence, both are examples of combination reactions.
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Which among the following statement(s) is(are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to:
(i) The formation of silver by decomposition of silver chloride
(ii) Sublimation of silver chloride
(iii) Decomposition of chlorine gas from silver chloride
(iv) Oxidation of silver chlorideEvergreen Science
Which of the following are exothermic processes?
(i) Reaction of water with quicklime
(ii) Dilution of an acid
(iii) Evaporation of water
(iv) Sublimation of camphor (crystals)Evergreen Science