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Molecular Mass

a Who gave th...

Question

(a) Who gave the law of constant proportion?

(b) Write symbols of the following Ions :

(i) Ferric ion (ii) Calcium ion (iii) Peroxide ion (iv) Sulphate ion (v) Nitrate ion

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Solution

(a) Joseph Proust

(b) (i) Fe3+ (ii) Ca2+ (iii) O22- (iv) SO42- (v) NO3-

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Q. (a) Write the symbols/formulae of two simple ions and two compound ions (or polyatomic ions).
(b) An element Y has a valency of 4. Write the formula for its :
(i) chloride
(ii) oxide
(iii) sulphate
(iv) carbonate
(v) nitrate

Q. Classify the cations and anions:
(i) nitride ion (ii) stannous ion (iii) ferric ion (iv) hydroxide ion

Q. (a) What is an ion ? How is an ion formed ? Explain with the help of two examples of different ions.
(b) The valencies (or charges) of some of the ions are given below :

Ion	Valency (Charge)	Ion	Valency (Charge)
Sodium ion	1+	Bromide ion	1–
Ammonium ion	1+	Hydroxide ion	1–
Calcium ion	2+	Sulphate ion	2–
Lead ion	2+	Phosphate ion	3–

Using this information, write down the formulae of the following compounds :
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(ii) Ammonium sulphate
(iii) Calcium hydroxide
(iv) Lead bromide

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S r^{2 +}

. Write down the formula for each of the following:
i) Strontium oxide ii) Strontium chloride iii) Strontium nitrate iv) Strontium sulphate

Q. Pick out the polyatomic anions from the following and write the formula.
a) Chloride ion b) Fluoride ion
c) Phosphate ion d) Sulphate ion

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