Gases deviate from ideal behaviour at high pressure. Which of the following is correct for non-ideality?

• At high pressure, the collision between the gas molecules become enormous

• At high pressure the volume of the gas molecules becomes negligible

• At high pressure the gas molecules move only in one direction

• At given pressure the intermolecular interaction become significant

At some constant pressure, V_l and V₂ are the volumes of a given mass of gas at temperature 300K and 327K respectively. The ratio of V₁ / V₂ is equal to

• 54/27

• 109/100

• 27/54

• 100/109

The crystals formed due to the only dipole – dipole forces are

• Ionic

• Molecular

• Covalent

• Metallic

An electron occupies the available degenerate orbitals before pairing in any one orbital according to

• (n +l) Rule

• Pauli’s exclusion principle

• Hund’s rule

• Heisenberg’s principle

n₂ is generally used to determine the maximum

• Number of electrons in a shell

• Number of electrons in an orbital

• Number of orbitals in a sub-shell

• Number of orbitals in a shell

The maximum number of electrons having s = +1/2 in 4d subshell are

• 10

• 14

• 5

• 7

Shape of ionic solid is affected by

• Electrostatic force of attraction

• Radius ratio

• Poor conductivity

• All of these

The fourth electron of Be atom will have the four set of quantum numbers as

• 1, 0, 0, ½

• 2, 1, 0, +½

• 2, 0, 0, – ½

• 1, 1, 1, + ½

Atomic mass unit is the reciprocal of

• Molar volume

• Mass of electron

• Avogadro’s number

• Mass of proton

Pure hydrogen gas can be an example of

• Element

• Substance

• Molecule

• All of these