Explain the Term ‘Variable Valency’.

Explain the term ‘variable valency’.

एका वाक्यात उत्तर

“When an element has more than one valency, its valency is called variable valency.”

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पाठ 5: Language of Chemistry - Exercises

पाठ 5 Language of Chemistry
Exercises | Q 3.1

Define of Molecular formula.

Write the molecular formulae for the following compounds and name the elements present of Sulphuric acid

Write the molecular formulae of Magnesium carbonate.

Explain the term ‘symbol’.

With reference to water and ammonia as compounds respectively, state the valency of oxygen and nitrogen.

Write the chemical formula of the following compound in a step-by-step manner –

Zinc hydroxide

Write the chemical formula of the following compound in a step-by-step manner –

Potassium dichromate

Write the chemical formula of the following compound in a step-by-step manner –

Iron [III] sulphur

Match the statements – 1 to 10 below with their correct answers from – A to J.

Column I	Column II
1. Elements having valency of two.	A: Br¹⁻
2. An anion	B: Divalent
3. A gaseous non-metal	C: Reactants
4. A cation.	D: Ammonium
5. The term used for the substances which take part in the chemical reaction	E: Nitric oxide
6. The meaning of the symbol ‘Δ’ over the arrow in a chemical equation.	F: Nitrogen
7. The chemical name for nitrogen monoxide.	G: Zero
8. A radical containing nitrogen and hydrogen only	H: Nitrous oxide
9. The chemical name for dinitrogen oxide	I: Heat required
10. The valency of noble gases	J: K¹⁺

Match the compounds in List I – 1 to 20 with their correct formulas in List II – A to T.