561.

The shape of XeF₆ is

• square planar

• distorted octahedral

• square pyramidal

• pyramidal

CO is a stronger ligand than Cl^-, because

• CO is a neutral molecule

• CO has $\mathrm{\pi }$-bonds

• CO is poisonous

• CO is more reactive

Which of the following sequence is correct regarding field strength of ligands as per spectrochemical series?

• SCN^- < F^- < CN^- < CO

• F^- < SCN^- < CN^- < CO

• CN^- < F^- < CO < SCN^-

• SCN^- < CO < F^- < CN^-

The increasing order of bond order of O₂, O${}_2^{+}, {\mathrm{O}}_2^{-} \mathrm{and} {\mathrm{O}}_2^{2-}$ is

• ${\mathrm{O}}_2^{+} < {\mathrm{O}}_2 < {\mathrm{O}}_2^{-} < {\mathrm{O}}_2^{2-}$

• ${\mathrm{O}}_2^{2-} < {\mathrm{O}}_2^{-} < {\mathrm{O}}_2^{+} < {\mathrm{O}}_2$

• ${\mathrm{O}}_2 < {\mathrm{O}}_2^{+} < {\mathrm{O}}_2^{-} < {\mathrm{O}}_2^{2-}$

• ${\mathrm{O}}_2^{2-} < {\mathrm{O}}_2^{-} < {\mathrm{O}}_2 < {\mathrm{O}}_2^{+}$

Main axis of diatomic molecule is z. The orbitals p_x and p_y overlap to form

• $\mathrm{\pi }$-molecular orbital

• σ-molecular orbital

• δ-molecular orbital

• No bond is formed

Using MOT, compare ${\mathrm{O}}_2^{+} \mathrm{and} {\mathrm{O}}_2^{-}$ species and choose the inncorrect option.

• ${\mathrm{O}}_2^{+}$ have higher bond order than ${\mathrm{O}}_2^{-}$

• ${\mathrm{O}}_2^{-}$ is less stable

• ${\mathrm{O}}_2^{+}$ is diamagnetic while ${\mathrm{O}}_2^{-}$ is paramagnetic

• Both ${\mathrm{O}}_2^{-} \mathrm{and} {\mathrm{O}}_2^{+}$ are paramagnetic

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