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Question

Identify the odd one out and justify.

(a) Chloride, nitrate, hydride, ammonium
(b) Hydrogen chloride, sodium hydroxide, calcium oxide, ammonia
(c) Acetic acid, carbonic acid, hydrochloric acid, nitric acid
(d) Ammonium chloride, sodium chloride, potassium nitrate, sodium sulphate
(e) Sodium nitrate, sodium carbonate, sodium sulphate, sodium chloride
(f)  Calcium oxide, magnesium oxide, zinc oxide, sodium oxide.
(g) Crystalline blue vitriol, crystalline common salt, crystalline ferrous sulphate, crystalline sodium carbonate.
(h) Sodium chloride, potassium hydroxide, acetic acid, sodium acetate.


Solution

ans
a.Ammonium = NH4+
Nitrate = NO3-
Hydride = H-
Chloride = Cl-
Ammonium is odd because Ammonium is cation and rest are anions.

b.Hydrogen chloride is odd because Hydrogen chloride is acid and rest are base.

c.Acetic acid = CH3COOH
   Carbonic acid = H2CO3
   Hydrochloric acid = HCl
   Nitric acid = - HNO3
   HCl is the only Diatomic Hetro-Nuclear compound and remaining are Poly Atomic compound.

d.Ammonium chloride is odd  because it is acidic salt and rest all are neutral salts.

e.Sodium carbonate is odd because the solutions of sodium nitrate, sodium sulphate and sodium chloride are neutral. But the solution of sodium carbonate is BASIC.

f.Calcium oxide = CaO
   Magnesium oxide = MgO
   Zinc oxide = ZnO
   sodium oxide = Na2O
   ZnO is odd because it is amphoteric in nature and other ions are basic in nature

g.Common salt is odd because on heating, there is no change in color of compound. But in rest of the compounds, there is change is colour.

h. Potassium hydroxide is odd because in a reaction, when Sodium chloride reacts with acetic acid, then Sodium acetate is formed. There is no role of Potassium hydroxide in the reaction given below.
NaCl +CH3COOHCH3COONa +HCl

Science
Science and Technology (Solutions)
Standard IX

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