The molecular motion ceases at

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(D) According to the kinetic theory of gases,the average kinetic energy of gas molecules is given by $K = \frac{3}{2} RT$.This implies $K \propto T$.S

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$-273^{\circ} C$

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(D) According to the kinetic theory of gases,the average kinetic energy of gas molecules is given by $K = \frac{3}{2} RT$.This implies $K \propto T$.Since kinetic energy cannot be negative,its minimum value is zero.Therefore,the minimum possible temperature is $0 \ K$,at which molecular motion ceases.Converting this to Celsius: $T(^{\circ} C) = T(K) - 273 = 0 - 273 = -273^{\circ} C$.

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