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प्रश्न
Give reason for the following:
Covalent compounds have a low melting and boiling point.
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उत्तर
Covalent compounds are held together by modest intramolecular forces. As a result, breaking the bonds between two or more molecules requires only a minimal amount of energy.
Therefore, these compounds have low melting and boiling points.
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संबंधित प्रश्न
By drawing an electron dot diagram show the formation of Ammonium ion [Atomic No.: N = 7 and H = 1]
The following table shows the test a student performed on four different aqueous solutions which are X, Y, Z and W. Based on the observations provided, identify the cation present:
| Chemical test | Observation | Conclusion |
| To solution X, ammonium hydroxide is added in minimum quantity first and then in excess |
A dirty white precipitate is formed which dissolves in excess to form a clear solution |
(1) |
| To solution Y ammonium hydroxide is added in the minimum quantity first and then in excess |
A pale blue precipitate is formed which dissolves in excess to form a clear inky blue solution. |
(2) |
| To solution W a small quantity of sodium hydroxide solution is added and then in excess. |
A white precipitate is formed which remains insoluble. |
(3) |
| To a salt Z calcium hydroxide the solution is added and then heated. |
A pungent smelling gas turning moist red litmus paper blue is obtained. |
(4) |
Choose the correct answer from the options given below:
A compound X consists of only molecules. Hence, X will have
A. A crystalline hard structure
B. A low melting point and low boiling point
C. An ionic bond
D. A strong force of attraction between its molecules
Give two example in the following case:
Co-ordinate bond compounds
Why do atoms combine?
Fill in the blanks
A coordinate bond is represented by an arrow pointing from ________ to__________ atom.
Choose the correct answer from the options given below
Which one is coordinate molecule?
Give suitable chemical terms for the bond formed by a shared pair of electrons with both electrons coming from the same atom.
What are the term defined below?
A bond formed by a shared pair of electrons with both electrons coming from the same atom.
Identify the following:
A bond formed between two atoms by sharing of a pair of electrons, with both electrons being provided by the same atom.
