Which among the following is paramagnetic ?

• Cl₂O

• ClO₂

• Cl₂O₇

• Cl₂O₆

Acetic acid reacts with PCl₅, to form

• CH₂ClCOOH

• CHCl₂COOH

• CH₃COCl

• CH₃COOCl

Sulphur does not exist as S₂ molecule because

• it is less electronegative

• it is not able to constitute $\mathrm{p\pi }-\mathrm{p\pi }$ bonds

• it has ability to exhibit catenation

• of tendency to show variable oxidation states

Polyanion formation is maximum in

• nitrogen

• sulphur

• oxygen

• boron

745.

Oleum is

• castor oil

• oil of vitriol

• fuming H₂SO₄

• none of the above

Oxidation number of sulphur in Caro's acid is 

• +6

• +4

• +8

• +7

Liquor ammonia is

• ammonium hydroxide

• liquified ammonia gas

• concentrated solution of NH₃ in water

• a solution of NH₃ in alcohol

The correct structure of tribromooctaoxide is

The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is :

• 20

• 30

• 40

• 10

Which is the correct thermal stability order for H₂E (E = O, S, Se, Te and Po)?

• H₂O < H₂S < H₂Se < H₂Te < H₂Po

• H₂Po < H₂Te < H₂Se < H₂S < H₂S

• H₂Se < H₂Te <H₂Po < H₂O < H₂S

• H₂S < H₂O < H₂Se < H₂Te <H₂Po