What is the effect of increasing pressure on the dissociation of PCl₅ according to the equation?

PCl₅ (g) $\rightleftharpoons$ PCl₃ (g) + Cl₂ (g)

• Dissociation decreases

• Dissociation increases

• Dissociation does not change

• None of the above

The ground state term symbol for an electronic state is governed by :

• Heisenberg's principle

• Hund's rule

• Aufbau principle

• Pauli exclusion principle

The following salt shows maximum covalent character:

• AlCl₃

• MgCl₂

• CsCl

• LaCl₃

Which of the following is paramagnetic ?

• B₂

• C₂

• N₂

• F₂

15.

What is the ratio of mass of an electron to the mass of a proton ?

• 1 : 2

• 1 : 1

• 1 : 1837

• 1 : 3

Pauling's electronegativity values for elements are useful in predicting :

• polarity of bonds in molecules

• position of elements in electromotive series

• co-ordination number

• dipole moment of various molecules

The trigonal bipyramidal geometry results from the hybridisation :

• dsp³ or sp³d

• dsp² or sp²d

• d²sp³ or sp³d²

• d³p² or d²p³

Two moles of PCl₅ were heated in a closed vessel of 2 L. At equilibrium, 40% of PCl₅ is dissociated into PCl₃ and Cl₃. The value of equilibrium constant is :

• 0.53

• 0.267

• 2.63

• 5.3

The molecule having smallest bond angle is :

• H₂O

• H₂S

• NH₃

• H₂Te

What is the effect of having the pressure by doubling the volume on the following system at 500°C?

H₂ (g) + I₂ (g) $\rightleftharpoons$ 2HI (g)

• Shift to reactant side

• Shift to product formation

• Liquefaction of HI

• No effect