Q.4 What is the atomicityof the following? 3 A/Av
a) Calcium
b) Sulphur
c) Common salt
Q.5 a) Give one example each of 5 A/D
i) Monovalent cation,
ii) Divalent molecule of an element
b) Find the molecular mass of the following
i) Calcium carbonate
ii) Sulphuric acid
iii) magnesium oxide
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