831.

Number of electrons surrounding Kr in KrF₂ is :

• 10

• 6

• 4

• 8

H - I - O bond angle in H₂O₂ :

• 90^o

• 180^o

• 109.5^o

• 94.8^o

Assertion : Molecular nitrogen is less reactive than molecular oxygen.

Reason : The bond length of N₂ is shorter than that of oxygen.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Electron deficient molecule is :

• CCl₄

• PCl₅

• BF₃

• SF₆

Number of unpaired electrons in O₂ molecule is :

• zero

• one

• two

• four

Bond order in benzene is :

• 1

• 2

• 1.5

• none of these

Among the following, the species having square planar geometry for central atom are
(i) XeF_4, (ii) SF_4, (iii) [NiCl₄]^2- ,(iv) [PdCl₄ ]^2-

• (i) and (iv)

• (i) and (ii)

• (ii) and (iii)

• (iii) and (iv).

Which of the following does not have a lone pair on the central atom ?

• NH₃

• PH₃

• BF₃

• PCl₃

What is the nature of the bond between B and O in (C₂H₅)₂OBH₃ ?

• Covalent

• Co - ordinate covalent

• Ionic bond

• Banana shaped bond

Among the following molecules

(i) $\stackrel{..}{\mathrm{X}}$eO₃ (ii) $\stackrel{..}{\mathrm{X}}$eOF₄ (iii) $\stackrel{..}{\mathrm{X}}$eF₆ 

those having same number of lone pairs on Xe are

• (i) and (ii) only

• (i) and (iii) only

• (ii) and (iii) only

• (i), (ii) and (iii)