301.

Which of the following structure of a molecule is expected to have three bond pairs and one lone pair of electrons?

• Octahedral

• Trigonal planar

• Pyramidal

• Tetrahedral

The paramagnetic molecule at ground state among the following is :

• H₂

• O₂

• N₂

• CO

The following salt shows maximum covalent character:

• AlCl₃

• MgCl₂

• CsCl

• LaCl₃

Which of the following is paramagnetic ?

• B₂

• C₂

• N₂

• F₂

The trigonal bipyramidal geometry results from the hybridisation :

• dsp³ or sp³d

• dsp² or sp²d

• d²sp³ or sp³d²

• d³p² or d²p³

The molecule having smallest bond angle is :

• H₂O

• H₂S

• NH₃

• H₂Te

Which of the following molecules has three-fold axis of symmetry ?

• NH₃

• C₂H₄

• CO₂

• SO₂

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:

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

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

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