1.

0.6 g of urea on strong heating with NaOH evolves NH3. Liberated NH3 will combine completely with which of the following HCl solution ? (1) 100 mL of 0.2 N HCl (2) 400 mL of 0.2 N HCl (3) 100 mL of 0.1 N HCl (4) 200 mL of 0.2 N HCl

Answer»

The answer is (1) 100 mL of 0.2 N HCl

2 × mole of Urea ≡ mole of NH3 ........(1)

mole of NH3 ≡ mole of HCl ........(2)

∴ mole of HCl = 0.02 mole.



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