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Standard XII

Chemistry

Octet Rule

A compound ...

Question

A compound $X$ consists of only molecules. Hence $X$ will have :

a crystalline hard structure

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a low melting point and low boiling point

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an ionic bond

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a strong force of attraction between its molecules

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Solution

The correct option is A a low melting point and low boiling point
Compounds made up of molecules have covalent bonding. Covalent bonding is present between the atoms of similar electronegativity. Covalent bonds are weak and easy to break. Hence, the have low melting and boiling points.

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Similar questions

(a) Compound X consists of molecules.

Choose the letter corresponding to the correct answer from the options A, B, C and D given below :

(i) The type of bonding in X will be :

A. ionic B. electrovalent

C. covalent D. molecular

(ii) X is likely to have a :

A. low melting point and high boiling point,

B. high melting point and low boiling point,

C. low melting point and low boiling point,

D. high melting point and high boiling point.

(iii) In the liquid state, X will :

A. become ionic,

B. be an electrolyte

C. conduct electricity,

D. not conduct electricity.

(b) Electrons are getting added to an element Y :

(i) is Y getting oxidized or reduced ?

(ii) what charge will Y migrate to during the process of electrolysis ?

(a) Compound X consists of molecules.
Choose the letter corresponding to the correct answer from the choices (a), (b), (c) and (d) given below:
(i) The type of bonding in X will be:
(a) ionic
(b) electrovalent
(c) covalent
(d) molecular
(ii) X is likely to have a:
(a) low melting point and high boiling point
(b) high melting point and low boiling point
(c) low melting point and low boiling point
(d) high milting point and high boiling point
(iii) In the liquid state, X will:
(a) become ionic
(b) be an electrolyte
(c) conduct electricity
(d) not conduct electricity

(b) (i) Acids dissolve in water to produce positively charged ions. Draw the structure of these positive ions.
(ii) Explain, why carbon tetrachloride does not dissolve in water?
(iii) Elements Q and S react together to form an ionic compound. Under normal conditions, which physical state will the compound QS exist in?
(iv) Can Q and S, both be metals? Justify your answer.

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

Q. Assertion :Ionic compounds have high melting points. Reason: Ionic compounds have strong electrostatic forces of attraction between the ions. Therefore, it requires a lot of energy to overcome these forces.

Why do covalent compounds have low melting and boiling points ?

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A compound X consists of only molecules. Hence X will have :

The correct option is A a low melting point and low boiling pointCompounds made up of molecules have covalent bonding. Covalent bonding is present between the atoms of similar electronegativity. Covalent bonds are weak and easy to break. Hence, the have low melting and boiling points.

A compound $X$ consists of only molecules. Hence $X$ will have :

The correct option is A a low melting point and low boiling point
Compounds made up of molecules have covalent bonding. Covalent bonding is present between the atoms of similar electronegativity. Covalent bonds are weak and easy to break. Hence, the have low melting and boiling points.