For which of the following substances, the enthalpy of atomization also represents the enthalpy of sublimation?

C_{12} H_{22} O_{11}

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K C l

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N a

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R b O H

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Solution

The correct option is C $N a$
Enthalpy of atomization is the enthalpy change when a compound's bonds are broken and is reduced to gaseous individual atoms. It is always a positive value.
Enthalpy of sublimation is the amount of energy added to a mole of a solid to turn it into a gas at a given temperature and pressure.
For an elemental solid both the terms are same as it becomes monoatomic after evaporation.
So for Na, enthalpy of atomization and enthalpy of sublimation are the same
For other options, it will be different.

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