Which of the following is paramagnetic with bond order 0.5?

• F₂

• H${}_2^{+}$

• N₂

• O${}_2^{-}$

Match List-I with List-II and choose the correct matching codes from the choices given.

• A - 3; B - 5; C - 2; D - 1; E - 4

• A - 3; B - 5; C - 4; D - 1; E - 2

• A - 3; B - 5; C - 6; D - 1; E - 2

• A - 3; B - 5; C - 2; D - 6; E - 4

Among the following, the pair in which the two species are not isostructural are

• IO${}_3^{-}$ and XeO₃

• PF${}_6^{-}$ and SF₆

• BH${}_4^{-}$ and NH${}_4^{+}$

• CO${}_3^{2-}$ and NO${}_2^{-}$

Which of the following ions has a magnetic moment of 5.93 BM ?

(At. no. V = 23; Cr = 24; Mn = 25; Fe = 26)

• Mn²⁺

• Fe²⁺

• Cr²⁺

• V³⁺

Identify the correct statement from below, concerning the structure of CH₂ = C = CH₂

• The molecule is planar

• One of the three carbon atoms is in an sp³ hybridized state

• The molecule is non-planar with the two -CH₂ groups being in planes perpendicular to each other

• All the carbon atoms are sp-hybridized

Molecular shapes of SF₄, CF₄, XeF₄ are :

• the same with 2, 0 and 1 lone pair of electron respectively

• the same with 1, 1 and 1 lone pair of electrons respectively

• different with 0, 1 and 2 lone pair of electrons respectively

• different with 1, 0 and 2 lone pair of electrons respectively

The presence of Ag⁺ ion increases the solubility of alkenes due to the formation of :

• d$\mathrm{\pi }$-dσ bonding

• pσ-p$\mathrm{\pi }$ bonding

• p$\mathrm{\pi }-\mathrm{d\pi }$ bonding

• None of the above

Each B - H - B bridge in B₂H₆ is formed by the sharing of:

• 2 electrons

• 4 electrons

• 1 electron

• 3 electrons

149.

If the molecule of HCl were totally polar, the expected value of dipole moment is 6.12 D (debye), but the experimental value of dipole moment was 1.03 D. Calculate the percentage ionic character :

• 17

• 83

• 50

• Zero

Which one of the following molecules has the smallest bond angle ?

• NH₃

• PH₃

• H₂O

• H₂Se