Chemical Bonding and Atomic Structure MCQs for NEET — Chemistry Questions with Answers

(B) Both Assertion and Reason are true statements but are different and reason is

      not true explanation of assertion. High electronegativity of atoms attached to carbon atom

      indirectly results into the contraction of the size of p-orbitals. As carbon atomic size is smaller

      and thus it has effective overlapping.

(A) Number of electrons ${\mathrm{NO}}^{+} = 7+8-1 = 14$

      Number of electrons ${\mathrm{CN}}^{-} = 6+7+1 = 14$

      Bond order $= \frac{10-4}{2}=3$

      Both are diamagnetic.

(B) Within the ${\mathrm{Ca}}^{2+}/{\mathrm{SO}}_4^{2-}$ layers the ions are held together by strong electrovalent bonds. But

      these separated ${\mathrm{Ca}}^{2+}/{\mathrm{SO}}_4^{2-}$ layers linked by relative weak H-bond. The weaker H-bonds and

      stretched along the layer of water molecules.

      Anhydride has a completely ionic structure involving only ${\mathrm{Ca}}^{2+} \mathrm{and} {\mathrm{SO}}_4^{2-}$ ions.

To attain stability energy is released.

As the size of cation increases polarising power decreases hence ionic character increases.

CO is diamagnetic as there are no odd electrons in the molecule.

Anhydrous AlCl₃ is covalent and is soluble in non polar solvents.

It is the basic definition.

Bond order of O₂⁺ is 2.5 which is maximum among all the species hence its bond strength will also be maximum.

Due to small size of anion.