Pair of substances undergoing sublimation is :

Foundation

Chemistry Foundation

Phase Transformation Melting Evaporation and Sublimation

Question

Sodium and Borax

Bromine and Iodine

Dry Ice and Nausadar

Naphthalene and Blue Vitriol

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Sublimation is the process where a solid directly changes to gas without passing through the liquid state.

Let's evaluate the options:

Sodium and Borax: Both do not sublime.

Bromine and Iodine: Iodine sublimes, but bromine is a liquid.

Dry Ice (solid CO ${CO}_{2}$ ) and Nausadar (NH ${NH}_{4}$ Cl) both sublime.

Naphthalene sublimes, but Blue Vitriol (CuSO ${CuSO}_{4}$ ·5H $H_{2}$ O) does not.

Final answer: Dry Ice and Nausadar