Which one of the following is formed apart from sodium chloride when chlorine reacts with hot concentrated sodium hydroxide?

• NaOCl

• NaClO₃

• NaClO₂

• NaClO₄

Helium mixed with oxygen is used in the treatment of

• beri beri

• burning feet

• joints burning

• asthma

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

925.

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

0.16 g of an organic compound containing sulphur produces 0.233 g of BaSO₄. Percentage of sulphur in the compound is

• 20

• 80

• 50

• 10

Which one of the following cannot form an amphoteric oxides?

• Al

• Sn

• Sb

• P