NCERT Solutions for Chapter: Is Matter Around Us Pure?, Exercise 1: Multiple Choice Questions

Rusting of an article made up of iron is called

A mixture of sulphur and carbon disulphide is
 

Tincture of iodine has antiseptic properties. This solution is made by dissolving

Which of the following are homogeneous in nature?
(i) lce
(ii) Wood
(iii) Soil
(iv) Air

Which of the following are physical changes?
(i) Melting of iron metal
(ii) Rusting of iron
(iii) Bending of an iron rod:
(iv) Drawing a wire of iron metal

Which of the following are chemical changes?
(i) Decaying of wood
(ii) Burning of wood
(iii) Sawing of wood
(iv) Hammering of a nail into a piece of wood

Two substances, A and B were made to react to form a third substance, ${\mathrm{A}}_2\mathrm{B}$ according to the following reaction: $2\mathrm{A}+\mathrm{B}\to {\mathrm{A}}_2\mathrm{B}$
Which of the following statements concerning this reaction are incorrect?
(i) The product ${\mathrm{A}}_2\mathrm{B}$ shows the properties of substances $\mathrm{A}$ and $\mathrm{B}$.
(ii) The product will always have a fixed composition.
(iii) The product so formed cannot be classified as a compound.
(iv) The product so formed is an element.

Two chemical species X and Y combine together to form a product P which contains both X and Y
$\mathrm{X}+\mathrm{Y}\to \mathrm{P}$ 
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?
(i) P is a compound
(ii) X and Y are compounds
(iii) X and Y are elements
(iv) P has a fixed composition