Pick out the wrong statement about the properties of covalent compounds.

They posses high melting and boiling points

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They have poor thermal and electrical conductivity

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They are generally soft or brittle

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they have low enthalpies of fusion and vaporization

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Solution

The correct option is C They posses high melting and boiling points
Not true, many covalent compounds are gases $(O_{2}, N_{2})$ which do not have such cases.
$\to$ not soft always
$\to$ they have high ${△ H}_{v a p}$ due to gaseous nature of some molecule.

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Similar questions

Explain the following:
(a) Covalent compounds are generally gases or liquids or soft solids.
(b) Covalent compounds have low melting point and boiling point.
(c) Non-polar covalent compounds are insoluble in water.
(d) Polar covalent compounds are good conductors of electricity.

Q. Covalent compounds have generally low melting and boiling points.

Q. Choose the correct statements about covalent compounds.
i. Generally, covalent compounds have low melting and boiling points.

ii. Covalent compounds are usually good conductors of electricity.

iii. Covalent compounds are generally soluble in organic solvents like petrol and kerosene.

iv. All covalent compounds are soluble in water.

[1 mark]

Q. Melting and boiling points of covalent compounds are generally high.

Q. Give reasons for the following statements
Why covalent compounds
(i) are bad conductors of electricity.
(ii) have low melting and boiling points.

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Pick out the wrong statement about the properties of covalent compounds.

The correct option is C They posses high melting and boiling pointsNot true, many covalent compounds are gases (O2,N2) which do not have such cases.→ not soft always→ they have high △Hvap due to gaseous nature of some molecule.

The correct option is C They posses high melting and boiling points
Not true, many covalent compounds are gases $(O_{2}, N_{2})$ which do not have such cases.
$\to$ not soft always
$\to$ they have high ${△ H}_{v a p}$ due to gaseous nature of some molecule.