The compound molecular in nature in gas phase but ionic in solid state is

• PCl₅

• ${\mathrm{CCl}}_4$

• PCl₃

• POCl₃

Which two of the following salts are used for preparing iodized salt?

(i) KIO₃, (ii) KI, (iii) I₂, (iv) HI

• (i) and (ii)

• (i) and (iii)

• (ii) and (iv)

• (iii) and (iv).

Industrial name for H₂S₂O₇ is :

• Pyrosulphuric acid

• Marshall's acid

• Oleum

• all of the above

I₂ dissolves in KI solution due to the formation of :

• KI₂ and I^-

• K⁺ , I^- and I₂

• KI₃^-

• none of these

Which of the following is anhydride of perchloric acid ?

• Cl₂O₇

• Cl₂O₅

• Cl₂O₃

• HClO

Which of the following sulphides is yellow in colour ?

• CuS

• CdS

• ZnS

• CoS

Which of the following oxide does not form acidic aqueous solution ?

• N₂O₃

• NO₂

• N₂O₅

• NO

The number of P - O - P bridges in the structure of phosphorus pentoxide and phosphorus trioxide are respectively

• 6, 6

• 5, 5

• 5, 6

• 6, 5

679.

Fluorine is the best oxidising agent because it has :

• highest electron affinity

• highest E^o_red

• highest E^o_oxid

• lowest electron effinity

Bleaching action of SO₂ is due to its :

• oxidising property

• acidic property

• basic property

• reducing property