$N H_{3}$ & $S O_{2}$ gases are being prepared in two corners of a laboratory. The gas that will be detected first in the middle of the laboratory is

N H_{3}

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S O_{2}

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both at the same time

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can't determine

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Solution

The correct option is A $N H_{3}$
The rate of diffusion is inversely proportional to the square root of the molar mass.
The molar masses of ammonia and sulphur dioxide are 17 $g / m o l$ and 64 $g / m o l$ respectively.
Since, the molar mass of ammonia is lower, its rate of diffusion will be higher.
Hence, ammonia will be detected first in the middle of the laboratory.

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Q. The diagram showing the laboratory preparation of

{N H}_{3}

is given.
(a) What are the reactants used?
(b) Why

C a O

is used?
(c) What is the reason behind not keeping the jar in the upward direction?
(d) Write an experiment to identify presence of

{N H}_{3}

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Q. Which of the following can be used to prepare hydrogen gas in the laboratory?

Q. (A)

S O_{2}

and

C O_{2}

both turn lime water milky.

(B)

S O_{2}

also turns

K_{2} C r_{2} O_{7} / H^{+}

green.

(C)

O_{2}

is soluble in pyrogallol turning it black.

These gases are to be detected in order by using these reagents. The order is :

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NH3 & SO2 gases are being prepared in two corners of a laboratory. The gas that will be detected first in the middle of the laboratory is

$N H_{3}$ & $S O_{2}$ gases are being prepared in two corners of a laboratory. The gas that will be detected first in the middle of the laboratory is