Chemistry
Give an example of three elements exhibiting variable valency.
Atomic Structure
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Answer
Three elements exhibiting variable valency are:
- Iron (Fe) can show a valency of 2 and 3.
- Copper (Cu) can show a valency of 1 and 2.
- Lead (Pb) can show a valency of 2 and 4.
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Related Questions
Explain the term – 'valency'. State giving reasons the valency of –
(a) chlorine in hydrogen chloride
(b) sulphate in sulphuric acid
(c) nitrogen in ammonia
(d) magnesium in magnesium oxide
Give the symbol and valency of the following elements and radicals.
(a) Potassium
(b) Sodium
(c) Hydrogen
(d) Calcium
(e) Aluminum
(f) Magnesium
(g) Zinc
(h) Chlorine [chloride]
(i) Sulphur [sulphide]
(j) Nitrogen [nitride]
(k) Oxygen [oxide]
(l) Ammonium
(m) Bicarbonate
(n) Nitrate
(o) Bisulphate
(p) Bisulphite
(q) Hydroxide
(r) Carbonate
(s) Sulphate
(t) Sulphite
State what is meant by the term – chemical formula. Give the chemical formula of –
(a) sodium hydroxide
(b) sodium nitrate
(c) sodium bicarbonate
(d) sodium sulphite
(e) magnesium nitrate
(f) ammonium sulphate
(g) carbonic acid
(h) calcium phosphate
'Dilute hydrochloric acid is added to sodium hydroxide'. Give a word equation and a molecular equation of the same. Is the equation written, a balanced equation. Give reasons.