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Standard IX

Chemistry

Covalent Bonding

The property ...

Question

The property which is characteristic of an electrovalent compound is that :

it is easily vaporised

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it has a high melting point

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it is a weak electrolyte

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it often exists as a liquid

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Solution

The correct option is B it has a high melting point
The property is characteristic of an electrovalent compound is that it has a high melting point .

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Choose the correct answer from the choices (a), (b), (c) and (d):
(i) The property which is characteristic of an electrovalent compound is that:
(a) it is easily vaporized
(b) it has a high melting point
(c) it is a weak electrolyte
(d) it often exists as a liquid.

(ii) When a metal atom becomes an ion:
(a) it loses electrons and is oxidised
(b) it gains electrons and is reduced
(c) it gains electrons and is oxidised
(d) it loses electrons and is reduced.

Choose the correct answer from the choices A, B, C and D :

(i) The property which is characteristic of an electrovalent compound is that :

A. it is easily vaporized,

B. it has a high melting point,

C. it is a weak electrolyte,

D. it often exists as a liquid.

(ii) When a metal atom becomes an ion :

A. it loses electrons and is oxidized,

B. it gains electrons and is reduced,

C. it gains electrons and is oxidized,

D. it loses electrons and is reduced.

(b) Choose the correct answer from the choices (A), (B), (C) and (D):
(i) The property which is characteristic of an electrovalent compound is that:
(A) it is easily vaporized
(B) it has a high melting point
(C) it is a weak electrolyte
(D) it often exists as a liquid
(ii) When a metal atom becomes an ion:
(A) it loses electrons and is oxidized
(B) it gains electrons and is reduced
(C) it gains electrons and is oxidized
(D) it loses electrons and is reduced
(iii) Which of the following hydroxides is not an alkali?
(A) ammonium hydroxide
(B) calcium hydroxide
(C) copper hydroxide
(D) sodium hydroxide

(a) Acids dissolve in water and produce positively charged ions. Draw the structure of these positive ions.

(b) Explain why Carbon tetrachloride does not dissolve in water.

(c) Elements Q and S react together to form an ionic compound. Under normal conditions, which physical state will the compound QS exist in ?

(d) Can Q and S, both be metals ? Justify your answer.

(e) The property which is characteristic of an electrovalent compound is that :

A. it is easily vaporized,

B. it has a high melting point,

C. it is a weak electrolyte,

D. it often exists as a liquid.

(f) When a metal atom becomes an ion :

A. it loses electrons and is oxidized,

B. it gains electrons and is reduced,

C. it gains electrons and is oxidized,

D. it loses electrons and is reduced.

Explain the following :

(a) Electrovalent compounds conduct electricity in molten or aqueous state.

(b) Electrovalent compounds have a high melting point and boiling point while covalent compounds have low melting and boiling points.

(d) Atoms combine by transfer and sharing of electrons (s).

(e) An element has atoms with different mass number.

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The property which is characteristic of an electrovalent compound is that :

The correct option is B it has a high melting point The property is characteristic of an electrovalent compound is that it has a high melting point .

The correct option is B it has a high melting point
The property is characteristic of an electrovalent compound is that it has a high melting point .