1.

Geometry of ammonia molecule and the hybridisation of nitrogen involved in it are

• sp³-hybridisation and tetrahedral geometry

• sp³-hybridisation and distorted tetrahedral geometry

• sp²-hybridisation and triangular geometry

• None of the above

Number of electrons in the valence orbit of nitrogen in an ammonia molecule is

• 8

• 5

• 6

• 7

Be in BeCl₂ undergoes

• diagonal hybridisation

• trigonal hybridisation

• tetrahedral hybridisation

• no hybridisation

For the reaction

PCl₅(g) → PCl₃(g) + Cl₂(g)

• ΔH = ΔE

• ΔH > ΔE

• ΔH < ΔE

• None of these

Which of the following is not a state function?

• Internal energy

• Enthalpy

• Work

• Entropy

Enthalpy (H) is equal to

• internal energy (E)

• product of pressure (p) and volume (V) of gas

• internal energy (E)+ pV

• work (W) done by a system

The pH of millimolar HCl is

• 1

• 3

• 2

• 4

0.5 M ammonium benzoate is hydrolysed to 0.25 percent, hence, its hydrolysis constant is

• 2.5 x 10^-5

• 1.5 x 10^-4

• 3.125 x 10^-6

• 6.25 x 10^-6

Conjugate base of ${\mathrm{HSO}}_4^{-}$ is

• ${\mathrm{SO}}_4^{2-}$

• H₂SO₄

• ${\mathrm{H}}_3{\mathrm{SO}}_4^{+}$

• None of these

The pH of the solution 5 mL of M/5 HCl + 10 mL of M/10 NaOH is

• 5

• 3

• 7

• 8