The p-Block Elements

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

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

Identify the incorrect statement related to PCl₅ from the following:

• Two axial P–Cl bonds make an angle of 180° with each other

• Axial P–Cl bonds are longer than equatorial P–Cl bonds

• PCl₅ molecules in non-reactive

• Three equatorial P–Cl bonds make an angle of 120° with each other

Match the Xenon compounds in Column-I with its structure in Column-II and assign the correct code:

Code:

• (a)  (b)  (c)  (d)
  (ii)  (iii)  (iv) (i)

• (a)  (b)  (c)  (d)
  (ii)  (iv)  (i) (iv)

• (a)  (b)  (c)  (d)
  (iii)  (iv)  (i) (ii)

• (a)  (b)  (c)  (d)
  (i)  (ii)  (iii) (iv)