Question

Match the following, choosing one item from Column - X and the appropriate related item from Column - Y.
$\begin{array}{cc}\text{Column-X}& \text{Column-Y}\\ \begin{array}{cc}\text{(p)}& \text{Equal volumes of all gases contain}\\ & \text{equal number of molecules at NTP.}\end{array}& \text{(i) Dalton's atomic theory}\\ \begin{array}{cc}\text{(q)}& \text{The atom is indestructible}\end{array}& \text{(ii) Law of conservation of mass}\\ \begin{array}{cc}\text{(r)}& \text{All pure samples of the compound}\\ & \text{contain the same elements combined}\\ & \text{in the same proportion of mass.}\end{array}& \text{(iii) Avogadro's law}\\ \begin{array}{cc}\text{(s)}& \text{Total mass before and after the}\\ & \text{chemical reaction is same.}\end{array}& \text{(iv) Gay-Lussac's law}\\ \begin{array}{cc}\text{(t)}& \text{Gases react in simple ratio of their}\\ & \text{volumes}\end{array}& \text{(v) Law of constant proportions}\end{array}$

• A. (p – iii), (q – i), (r – v), (s – ii), (t – iv)
• B. (p – iii), (q – i), (r – v), (s – iv), (t – ii)
• C. (p – iii), (q – v), (r – i), (s – ii), (t – iv)
• D. (p – iii), (q – ii), (r – v), (s – i), (t – iv)

Answer 1

The correct option is A (p – iii), (q – i), (r – v), (s – ii), (t – iv)

Law of conservation of mass: The matter can be neither be created nor destroyed during a chemical change.
(or)
Total mass of the products formed during a chemical change is exactly equal to the total mass of the reactant.

Law of constant proportions: A pure chemical compound always contains same elements combined in the same definite proportions by weight.

Gay – Lussac’s law of combining volumes: Under similar conditions of temperature and pressure, whenever gases react together, the volumes of the reacting gases as well as products (if gases) bear a simple whole number ratio.

Avogadro’s law: Equal volume of all gases contain equal number of molecules under similar conditions of temperature and pressure.

Dalton’s atomic theory: Matter is made up of extremely small indivisible and indestructible ultimate particles called atoms.