(a) An anion is formed when one hydrogen atom is replaced from one molecule of sulphuric acid. This cation is present in a salt containing a bivalent metal M. Calculate the number of oxygen atom present in one molecule of the salt.

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Solution

Radicals are charged atoms with positive or negative charges.
Anions are negatively charged ions. eg: Cl^-1, O^-2, F ^-1.
Cations are positively charged ions. eg: Na⁺²,Ca⁺²,Al⁺³
The anion formed when one hydrogen is replaced from sulphuric acid (H₂SO₄) is HSO₄^-1(hydrogen sulphate).Its valency is 1.
The cation M is bivalent ( M⁺².)
.Therefore, the formula of the salt is M(HSO₄)₂.
Number of atoms of each elements present in one molecule of M(HSO₄)₂ is M=1, H=2, S=2, O=8.
Atomicity of the salt is 13.
The number of oxygen atoms present in one molecule of the salt is 8.

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