On a hot summer night, the refractive index of air is the smallest near the ground and increases with height from the ground. When a light beam is directed horizontally, the Huygens' principle leads us to conclude that as it travels, the light beam

goes horizontally without any deflection

In aqueous solution, the ionisation constants for carbonic acid are K 1 = 4.2 × 10 -7 and K 2 = 4.8 × 10 -11 . Select the correct statement for a saturated 0.034 M solution of carbonic acid.

The concentration of CO 3 2 - is 0.034.

The concentration of CO 3 2- is greater than that of HCO 3 - .

The concentrations of H + and HCO 3 - are approximately equal.

The concentration of H + is double that of CO 3 2- .

In which of the following arrangements is the order not according to the property indicated against it?

Al 3+ 2 + - - Increasing ionic size

I < Br < F < Cl - Increasing electron gain enthalpy (with negative sign)

Li < Na < K < Rb - Increasing metallic radius

The metallic lustre exhibited by sodium is explained by

oscillations of loose electrons

existence of body centered cubic lattices

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