21.

Phosgene is formed slowly from which one of the following on exposure to air and sunlight?

• CHCl₃

• H₃CCl

• H₃COH

• C₂H₅Cl

The volume in mL of 0.1 M solution of NaOH required to completely neutralise 100 mL of 0.3 M solution of H₃PO₃ is

• 60

• 600

• 300

• 30

Match the following-

• A - iii; B - i; C - ii; D - v

• A - ii; B - v; C - i; D - iv

• A - iii; B - iv; C - i; D - ii

• A - v; B - i; C - iv; D - ii

If the values of ${\wedge }_{\infty }$ of NH₄Cl, NaOH and NaCl are 130, 217 and 109 ohm^-1 cm² equiv^-1 respectively, the ${\wedge }_{\infty }$ of NH₄OH in ohm^-1 cm² equiv^-1 is

• 238

• 196

• 22

• 456

The number of unit cells present in 39 g of potassium if it crystallizes as body centred cube is (N = Avogadro number, At. wt. of potassium = 39)

• $\frac{\mathrm{N}}{4}$

• $\frac{\mathrm{N}}{2}$

• $\frac{\mathrm{N}}{3}$

• N

Which one of the following gives a straight line for Freundlich adsorption isotherm?

• log $\frac{\mathrm{x}}{\mathrm{m}}$ vs log p

• $\frac{\mathrm{x}}{\mathrm{m}} \mathrm{vs} \frac{1}{\mathrm{p}}$

• log $\frac{\mathrm{x}}{\mathrm{m}} \mathrm{vs} \log \frac{1}{\mathrm{p}}$

• $\frac{\mathrm{x}}{\mathrm{m}} \mathrm{vsp}$

The total number of σ and $\mathrm{\pi }$-bonds in pyrophosphoric acid are respectively

• 8, 2

• 10, 2

• 12, 2

• 8, 4

What are the products formed when moist chlorine gas is reacted with hypo?

• Na₂SO₄, S, HCl

• Na₂SO₃, S, HCl

• Na₂S₄O₆, Na₂SO₃, HCl

• Na₂S₄O₆, NaCl, HCl

What is the bond angle in ClO₂ (OClO)?

• 90°

• 118°

• 105°

• 111°

The hybridisation of Xe and the number of lone pairs of electrons on it in XeF₆ are

• sp³d², 1

• sp³d³, 2

• sp³d², 2

• sp³d³, 1