Baljinder Kaur Solutions for Chapter: Matter and Its Composition, Exercise 2: Objective Questions

What are cohesive forces?

Give one word for the following:

The process by which molecules strike each other.

Give one word for the following:

The temperature at which liquid changes into a vapour.

Give one word for the following:

The heat is needed to convert a tightly bound solid to a loosely bound liquid. (Latent heat of fusion / Latent heat of vapourisation)

Give one word for the following:

The solid was obtained after the solidification of vapours of the sublimable compound.

Give one word for the following:

A natural substance capable of existing in all three states.

Show that the following equations are in accordance with the law of conservation of mass:

$\left(\mathrm{Atomic} \mathrm{mass}:\mathrm{Fe}=56, \mathrm{S}=32, \mathrm{H}=1, \mathrm{Cl}=35.5\right)$

$\mathrm{Fe}+\mathrm{S}\to \mathrm{FeS}$

Show that following equations are in accordance with the law of conservation of mass:

$\left(\mathrm{Atomic} \mathrm{mass}:\mathrm{Fe}=56, \mathrm{S}=32, \mathrm{H}=1, \mathrm{Cl}=35.5\right)$

${\mathrm{H}}_2+{\mathrm{Cl}}_2\to 2\mathrm{HCl}$