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Q.

solutions of alkali metals in liquid ammonia at 240 K conduct electricity without chemical reaction at the electrodes. Hence, conductivity should

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a

increase as temperature is lowered

b

decrease as temperature is lowered

c

remain constant on changing the temperature

d

there is always interaction of alkali metal with liquid ammonia 

answer is A.

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Detailed Solution

The conductivity invariably increases with increasing temperature, opposite to metals but similar to graphite. It is affected by the nature of the ions, and by viscosity of the water.

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