Q30 of 203 Page 152

Define ‘formula unit’ of an ionic compound. What is the formula unit of (i) sodium chloride, and (ii) magnesium chloride?

Formula unit is defined as the empirical formula of a compound which gives the simplest whole number ratio of atoms of the various elements present in the molecule of the compound.

Formula Unit of Sodium Chloride- NaCl


Formula Unit of Magnesium Chloride- MgCl2.


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29

Write the symbols/formulae of two simple ions and two compound ions (or polyatomic ions).

 29

An element Y has a valency of 4. Write the formula for its:

(i) chloride


(ii) oxide


(iii) sulphate


(iv) carbonate


(v) nitrate

 30

Calculate the formula masses of the following compounds:

(i) Calcium chloride


(ii) Sodium carbonate


(Given: Atomic masses: Ca = 40 u; Cl = 35. 5 u; Na = 23 u; C = 12 u; O = 16 u)

 31

The atomic number of an element X is 13. What will be the number of electrons in its ion X3+?