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.

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Solution

(i) Electrovalent compounds have high melting point. Hence, the correct answer is (b).

(ii) When a metal atom becomes an ion, it loses electrons and is oxidised. Hence, the correct answer is (a).

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(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

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.

(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.

Choose the correct optiom

When a metal atom becomes an ion

1)it loses electrons and it is oxidised

2)it gains electrons and it's reduced

3)it loses electrons and it's reduced

4)it gains electrons and it's oxidised

Q. When a neutral atom loses an electron, it is called _____ and when it gains an electron, it is called _____.

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(i) Electrovalent compounds have high melting point. Hence, the correct answer is (b). (ii) When a metal atom becomes an ion, it loses electrons and is oxidised. Hence, the correct answer is (a).

(i) Electrovalent compounds have high melting point. Hence, the correct answer is (b).

(ii) When a metal atom becomes an ion, it loses electrons and is oxidised. Hence, the correct answer is (a).