Which of the following is not a rule for writing chemical formula?

The valencies or charges on the ion must balance

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The symbol of non-metal is written before metal

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In case of compounds with polyatomic ions, the ion is enclosed in a bracket before writing the ratio, otherwise no need of bracket

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All the options are correct

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Solution

The correct option is B The symbol of non-metal is written before metal
The symbol of metal is written before non-metal in case both are present.

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Similar questions

In compound formed with polyatomic ion, the ion is enclosed in a bracket before writing the number to indicate the ratio.

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

Element X is a metal with a valency 2. Element Y is a non-metal with a valency 3.
(a) Write equations to show how X and Y form ions.
(b) If Y is a diatomic gas, write the equation for the direct combination of X and Y to form a compound.

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 :
(i) Sodium phosphate
(ii) Ammonium sulphate
(iii) Calcium hydroxide
(iv) Lead bromide

Q. Element X is a metal with a valency 2, Y is a non-metal with a valency 3.Write an equation, to show how Y forms an ion.

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Which of the following is not a rule for writing chemical formula?

The correct option is B The symbol of non-metal is written before metalThe symbol of metal is written before non-metal in case both are present.

The correct option is B The symbol of non-metal is written before metal
The symbol of metal is written before non-metal in case both are present.