MCQ
Covalent compounds have low melting point because
- ACovalent bond is less exothermic
- BCovalent molecules have definite shape
- CCovalent bond is weaker than ionic bond
- ✓Covalent molecules are held by weak Vander Waal's force of attraction
✓
Answer
Correct option: D.
Covalent molecules are held by weak Vander Waal's force of attraction
d
The melting and the boiling points of covalent compounds are generally low because of the weak Van der Waals forces and so can be easily converted from liquid to gas or from solid to liquid.
The melting and the boiling points of covalent compounds are generally low because of the weak Van der Waals forces and so can be easily converted from liquid to gas or from solid to liquid.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The $pK_a$ of a weak acid, $HA,$ is $4.80.$ The $pK_b$ of a weak base, $BOH,$ is $4.78.$ The $pH$ of an aqueous solution of the correspondng salt, $BA,$ will be
→Match the compounds given in list-l with their characteristic reactions in list-ll and choose the correct answer.
| List-l (Compounds) | List-II (Reactions) |
a.  | i. Gives red colouration in victor Meyer's test |
b. | ii. Produces immediate turbidity with Luca's reagent |
| C. CH2CH2CHO | iii. Forms white precipitate with bromine water |
| d . C6H5CH2OH | iv. Forms silver mirror on reaction with ammoniacal AgNO3 solution. |
$2\,mol$ of zinc is dissolved in $HCl$ at $25\,^oC$. The work done is open vessel
→the given is enol form of
At ${25\,^o}C$, the highest osmotic pressure is exhibited by $0.1\,M$ solution of
→Correct order of catenation tendency:
Which one of the following on reaction with lucas reagent gives white precipitate fastest
Match List $I$ with List $II$:
→| List $I$ (Mixture) | List $II$ (Separation Technique) |
| $A$ $CHCl _3+ C _6 H _5 NH _2$ | $I$ Steam distillation |
| $B$ $C _6 H _{14}+ C _5 H _{12}$ | $II$ Differential extraction |
| $C$ $C _6 H _5 NH _2+ H _2 O$ | $III$ Distillation |
| $D$ Organic compound in $H _2 O$ | $IV$ Fractional distillation |
Maximum oxidation state is present in
Anode rays were discovered by