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Question

At the start of an experiment, one end of a U-tube of 6 mm glass tubing is immersed in concentrated ammonia solution and the other end in concentrated hydrochloric acid. At the point in the tube where vapour of ammonia and hydrochloric acid meet, white cloud is formed. At what fraction of the distance along the tube from the ammonia solution, the white cloud is first formed?

A
0.682
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B
0.534
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C
0.466
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D
0.595
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Solution

The correct option is D 0.595
Rate(NH3)Rate(HCl)=M(HCl)M(NH3)=36.517=1.4653


Thus NH3 gas moves faster than HCl. Hence, white fumes (of NH4Cl) are formed away from the NH3 end. Total length of the tube =AB+BC
AB= distance covered by NH3 in time t
BC= distance covered by HCl in time t
rNH3=ABt, rHCl=BCt
rNH3rHCl=ABBC=1.4653
BCAB=11.4653BCAB+1=11.4653+1
BC+ABAB=2.46531.4653ABTotal length=1.46532.4653=0.595

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