Which of the following compounds contain(s) no covalent bond(s)?
KCl, PH₃, O2, B₂H₆, H₂SO₄

• KCl, B₂H₆

• KCl, B₂H₆, PH₃

• KCl, H₂SO₄

• KCl

Total number of lone pair of electrons in  I₃^- ion is

• 12

• 3

• 6

• 9

Among Me₃N, C₅H₅N and MeCN (Me = methyl group) the electronegativity of N is in the order

• MeCN > C₅H₅N > Me₃N

• C₅H₅N > Me₃N > MeCN

• Me₃N > MeCN > C₅H₅N

• Electronegativity same in all

The shape of XeF${}_5^{-}$ will be

• square pyramid

• trigonal bipyramidal

• planar

• pentagonal bipyramid

The ground state magnetic property of B₂ and C₂ molecules will be

• B₂ paramagnetic and C₂ diamagnetic

• B₂ diamagnetic and C₂ paramagnetic

• Both are diamagnetic

• Both are paramagnetic

The correct order of O-O bond lenght in O_2, H₂O_2, and O₃

• O₂> O₃> H₂O₂

• H₂O₂ > O₃ > O₂

• O₃> O₂> H₂O₂

• O₃ > H₂O₂> O₂

The number of $\mathrm{\sigma }$ and $\mathrm{\pi }$ bonds between two carbon atoms in calcium carbide are

• $\mathrm{one} \mathrm{\sigma }, \mathrm{one} \mathrm{\pi }$

• $\mathrm{one} \mathrm{\sigma }, \mathrm{two} \mathrm{\pi }$

• $\mathrm{two} \mathrm{\sigma }, \mathrm{one} \mathrm{\pi }$

• $\mathrm{one} \mathrm{\sigma }, 1\frac{1}{2}\mathrm{\pi }$

308.

An element X belongs to fourth period and fifteenth group of the periodic table. Which of the following statements is true?

• It has completely filled s-orbital and a partially filled d-orbital.

• It has completely filled s-and p -orbitals and a partially filled d-orbital.

• It has completely filled s- and p-orbitals and a half filled d-orbital.

• It has a half filled p -orbital and completely filled s-and d-orbitals.

Of the following molecules, which have shape similar to CO₂?

• HgCl₂

• SnCl₂

• C₂H₂

• NO₂

The number of lone pairs of electrons on the central atoms of H₂O, SnCl₂, PCl₃ and XeF₂ respectively are

• 2, 1, 1, 3

• 2, 2, 1, 3

• 3, 1, 1, 2

• 2, 1, 2, 3