Download App

4. Chemical bonding and molecular structure — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry4. Chemical bonding and molecular structure1 Mark
MCQ
In an ionic compound $A^+ X^-$ the degree of covalent bonding is greatest when
  • A
    $A^+$ and $X^-$ ion are small
  • ✓
    $A^+$ is small and $X^-$ is large
  • C
    $A^+$ and $X^-$ ions are approximately of the same size
  • D
    $X^-$ is small and $A^+$ is large
✓

Answer

Correct option: B.
$A^+$ is small and $X^-$ is large
b
Due to Fazan's rule, according to which the cation distorts the electron cloud of the anion and pulls the electron density towards itself. Thus it introduces some covalent character in the lonic bond. Now, the smaller the cation, greater is its polarising power and larger the anion, greater will be its polarisability hence $A +$ is small and $X -$ is large.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 4. Chemical bonding and molecular structure→4. Chemical bonding and molecular structure — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Assuming that $\mathrm{Ba}(\mathrm{OH})_{2}$ is completely ionised in aqueous solution under the given conditions the concentration of $\mathrm{H}_{3} \mathrm{O}^{+}$ions in $0.005 \,\mathrm{M}$ aqueous solution of $\mathrm{Ba}(\mathrm{OH})_{2}$ at $298\, \mathrm{~K}$ is $.....\times 10^{-12}$ $mol$ $\mathrm{L}^{-1}$. (Nearest integer)
→
In the reaction product $D$ is $\begin{array}{*{20}{c}}
  {C{H_2}} \\ 
  {||\,\,\,\,\,\,\,\,} \\ 
  {C{H_2}} 
\end{array}$ $\xrightarrow{{B{r_2}/CC{l_4}}}A\xrightarrow{{KCN}}B\xrightarrow{{{H_3}{O^ + }}}C\xrightarrow{\Delta }D$
→
Which one of the following substances is a good oxidising agent?
→
Consider the reaction $HC{N_{(aq)}} \Leftrightarrow H_{(aq)}^+ + CN_{(aq)}^ - $. At equilibrium, the addition of $CN_{(aq)}^ - $ would
→
The fundamental basis of the present-day Periodic Table is that elements are
→
In which among the following pair both the elements are metalloids?
→
The number of $\sigma $ bonds in o-xylene is
→
One mole of an ideal gas at $300\, K$ is expanded isothermally from an initial volume of $1$ litre to $10$ litres. The value of $\Delta E$ for this process is $(R = 2\, cal\, mol^{-1}\, K^{-1})$
→
The correct sequence of ionisation enthalpy of Li, Be, B, C is:
→
Which of the following compound is wrongly named ?
→