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
The correct order as indicate in each option is
  • ✓
    $CaF_2 > CaCl_2 > CaBr_2$   Melting point
  • B
    $CH_3F > CH_3Cl > CH_3Br$    Dipole moment
  • C
    $np_{\pi } - np\pi  < ns-ns > ns-np$    Extent of overlapping
  • D
    $H_2 > H_2^+ = H_2^-$    Stability
✓

Answer

Correct option: A.
$CaF_2 > CaCl_2 > CaBr_2$   Melting point
a
Cation is same in all case while anions are different.

According to Fajans rule, the larger the size of the anion, greater is the covalent character of the ionic bond.

As covalent character increases, melting point decreases, thus order of melting point is:

$CaF _2\,> \,CaCl _2\,>\, CaBr _2$

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

The $IUPAC$ name of following compound is
→
Most reactive compound toward Electrophilic Substitution reaction is
→
Which titrant is used in the Iodometric titration which involves $\ce{I_2} ?$
→
The $X-X$ bond length is $1.00{\text{ }}\mathop {\text{A}}\limits^o $ and $C-C$ bond length is $1.54{\text{ }}\mathop {\text{A}}\limits^o $. If $EN$ of $'X'$ and $'C'$ are $3.0$ and $2.0$ respectively. The $C-X$ bond length is likely to be ............ $\mathop {\rm{A}}\limits^{\rm{o}} $
→
Calculate the heat produced in $kJ$ when $280\, g\, CaO$ is completely converted to  $CaCO_3$ by reaction with $CO_2$ at $27\,^oC$ and at constant volume :- 

(Given) $\Delta H^o_f (CaCO_3,s) = -1207 \, \frac{kJ}{mol}$

$\Delta H^o_f \,(CaO,s) = -635 \,kJ/mol$

$\Delta H^o_f \,(CO_2.g) = -394 \,kJ/mol$

→
Which of the following species must have maximum number of electrons in $'d_{xy}$ ;  orbital ?
→
Select correct set of statement

$(A)$ Addition of an electron in $O_2$ decreases bond order

$(B)$ Addition of an electron in $O_2$ increases bond order

$(C)$ Removal of an electron from $O_2$ increases bond length

$(D)$ Removal of an electron from $O_2$ decreases bond length

→
The magnetic moment of $M^{x+}$ (atomic number $= 25$ ) is $\sqrt {15}\,BM.$ The number of unpaired electrons and the value of $x,$ respectively, are
→
In the reaction,

$2Al{(s)}+6HCl{(aq)} \rightarrow 2Al^{^{3+}}{(aq)}+6Cl^-{(aq)} +3H_2{(g)}$

→
What volume of ammonia is required to react with $250\,mL$ of oxygen by following the reaction at same conditions ............. $\mathrm{mL}$

$4NH_3 + 5O_2 \to 4NO + 6H_2O$

→