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Subject :NSO    Class : Class 9

Study the given figure carefully and select the incorrect statement(s).

I. A white ring is formed which is closer to the hydrochloric acid end of the tube because hydrogen chloride fumes diffuse faster than ammonia.
II. Ratio of number of atoms of ammonia to that of hydrogen chloride which combine to form 3.6138 × 1024 atoms of ammonium chloride is 1 : 3.
III. 3.4 g of ammonia combines with 7.3 g of hydrogen chloride to form 10.7 g of ammonium chloride.
IV. If temperature is increased, white ring will be formed exactly in the middle of the tube.
(Given : Atomic mass of H = 1 u, N = 14 u, Cl = 35.5 u)

A II and IV only
B II and III only
C I, II and IV only
D I only


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