591.

The bond angle is smallest in

• H₂O

• H₂S

• BeCl₂

• N₂O

Which of the following shell, form an outer octahedral complex?

• d⁴

• d⁸

• d⁶

• None of these

Valence bond theory of metallic bond was given by

• Dalton

• Drudel

• Fajan

• Pauling 

The calculated bond order in O${}_2^{-}$ ions is

• 1

• 1.5

• 2

• 2.5

Which combination of atoms can form a polar covalent bond ?

• H and N

• H and Br

• N and N

• Na and Br

The bond length of H${}_2^{+}$, H${}_2^{-}$ and H₂ are in the following order

• H${}_2^{+}$ > H₂ > H${}_2^{-}$

• H₂ > ${\text{H}}_2^{+} > {\mathrm{H}}_2^{-}$

• H${}_2^{-}$ > H₂ > H${}_2^{+}$

• ${\mathrm{H}}_2^{-} > {\mathrm{H}}_2^{+}$ > H₂

The correct order of bond length is

• b > a > c > d

• a > b > c > d

• d > c > b > a

• c > d > b > a

Consider the following ions:

(i) Ni²⁺   (ii) Co²⁺  (iii) Cr²⁺   (iv) Fe³⁺

(Given, at. no. Cr = 24, Fe = 26, Co = 27, Ni = 28)

The correct order of magnetic moment of these ions is

• (i) < (ii) < (iii) < (iv)

• (iv) < (ii) < (iii) < (i)

• (i) < (iii) < (ii) < (iv)

• (iii) < (iv) < (ii) < (i)

Geometry of methyl free radical is

• pyramidal

• planar

• tetrahedral

• linear

The electron configuration of the oxide ion is much most similar to the electron configuration of the

• sulphide ion

• nitride ion

• oxygen atom

• nitrogen atom