Electrons in a paramagnetic compound are :

• shared

• upaired

• donated

• paired

sp³d hybridization results in :

• a square planar molecule

• an octahedron molecule

• a trigonal bipyramidal molecule

• a tetrahedron molecule

Which of the following is correct electron dot structure of N₂O molecule?

• :N=N=Ö:

• $:\mathrm{N}\equiv \stackrel{+}{\mathrm{N}}-\underset{..}{\overset{..}{\mathrm{O}}}:$

• $:\stackrel{..}{\mathrm{N}}=\mathrm{N}=\underset{..}{\overset{..}{\mathrm{O}}}$

• $:\stackrel{..}{\mathrm{N}}=\mathrm{N}-\underset{..}{\overset{..}{\mathrm{O}}}$

Which of the following combination will form an electrovalent bond ?

• P and Cl

• NH₃ and BF₃

• H and Ca

• H and S

Which one of the following compounds has the smallest bond angle in its molecule ?

• SO₂

• OH₂

• SH₂

• NH₃

The molecule which does not exhibit dipole moment is:

• NH₃

• CHCl₃

• H₂O

• CCl₄

287.

Which of the following is isoelectronic with CO₂?

• NO₂

• NO

• N₂O

• N₂O₄

All bond angles are exactly equal to 109° 28' in:

• methyl chloride

• iodoform

• chloroform

• carbon tetrachloride

The molecular shapes of SF₄, CF₄ and XeF₄ are

• different with 1, 0 and 2 lone pairs of electrons on the central atom, respectively

• different with 0, 1 and 2 lone pairs of electrons on the central atom, respectively

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

• the same with 2, 0 and 1 lone pairs of electrons on the central atom, respectively

The bond order of N${}_2^{+}$ is

• 1.5

• 3.0

• 2.5

• 2.0