The p-Block Elements

Dry bleach is done by

• O₃

• H₂O₂

• Cl₂

• SO₂

Which of the following sulphides is yellow in colour?

• CuS

• CdS

• ZnS

• CoS

Red P can be obtained by white P by

• Heating it with a catalyst, in an inert atmosphere

• Distilling it in an inert atmosphere

• Dissolving it in CS₂ and crystallizing

• Melting it and pouring the liquid into water

Fluorine is the best oxidising agent because it has :

• highest electron affinity

• highest E${}_{\mathrm{red}}^{°}$

• highest E${}_{\mathrm{oxid}}^{°}$

• lowest electron affinity

The basicity of H₃PO₄ is

• 2

• 3

• 4

• 5

NH₃ has much higher boiling point than PH₃ because

• NH₃ has larger molecular weight

• NH₃  undergoes umbrella inversion

• NH₃ forms hydrogen bond

• NH₃ contains ionic bonds whereas PH₃ contains covalent bonds.

When I₂ is passed through KCl, KF and KBr solutions:

• Cl₂ and Br₂ are evolved

• Cl₂ is evolved

• Cl₂, Br₂ and F₂ are evolved

• None of the above

Iodine readily dissolves in potassium iodide solution giving

• I^-

• KI^-

• KI^-₂

• KI₃

Which among the following is paramagnetic ?

• Cl₂O

• ClO₂

• Cl₂O₇

• Cl₂O₆

Acetic acid reacts with PCl₅, to form

• CH₂ClCOOH

• CHCl₂COOH

• CH₃COCl

• CH₃COOCl