HARD
9th CBSE
IMPORTANT
Earn 100

There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.
(a) What type of substance could X be? Name one substance like X.
(b) What type of substance could Y be? Name one substance like Y.
(c) What type of substance could Z be? Name one substance like Z.
(d) Which process involves absorption or release of an appreciable amount of energy: formation of substance X or formation of substance Z?
(e) Name the three groups into which all the substances like Y are divided on the basis of their properties.

Important Questions on Is Matter Around Us Pure

HARD
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 2 - Is Matter Around Us Pure>Questions Based on High Order Thinking Skills (HOTS)>Q 74
There is a large group of materials P which can be divided into three groups Q, R and S on the basis of their properties. The substances belonging to group Q can be solids, liquids or gases. The solids belonging to group Q are usually electrical insulators. Most of the substances of group R are solids which are good conductors of electricity. The substances belonging to group S are neither insulators like Q nor good conductors like R. The properties of S are intermediate between those of Q and R.
(a) What could the group of materials P be?
(b) Name the substances Q. Give two examples of such substances.
(c) Name the substances R. Write two examples of such substances.
(d) Name the substances S. Give two examples of such substances.
(e) Out of Q, R and S, which substances are malleable and ductile?
HARD
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 2 - Is Matter Around Us Pure>Questions Based on High Order Thinking Skills (HOTS)>Q 75
A, B and C are all liquids. Liquid A has a comparatively low boiling point. On heating, liquid A vaporises completely without leaving behind any residue. Liquid A is being used increasingly as a fuel in motor vehicles either alone or by mixing with petrol. liquid B has a very high boiling point. It also vaporises completely on heating, without leaving any residue. Liquid B is a conductor of electricity and used in making thermometers. Liquid C has a moderate boiling point. On heating, liquid C vaporises leaving behind a white solid D which is used in cooking vegetables. The condensation of vapours from C give a liquid E which turns anhydrous CuSO4 to blue.
(a) Which liquid could be an element? Name this element.
(b) Which liquid could be a mixture? Name this mixture.
(c) Which liquid could be a compound? Name this compound.
(d) What could the solid D be?
(e) What do you think is liquid E?
EASY
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 2 - Is Matter Around Us Pure>Very Short Answer Type Questions>Q 1
Out of a colloid, solution and a suspension which one has the smallest particles?
EASY
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 2 - Is Matter Around Us Pure>Very Short Answer Type Questions>Q 1
Out of a colloid, solution and a suspension which one has the largest particles?
EASY
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 2 - Is Matter Around Us Pure>Very Short Answer Type Questions>Q 2
What is the name of the clear liquid formed when a solid dissolves in a liquid?
HARD
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 2 - Is Matter Around Us Pure>Very Short Answer Type Questions>Q 3
Which of the two will scatter light, soap solution or sugar solution? Why?
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 2 - Is Matter Around Us Pure>Very Short Answer Type Questions>Q 4
State whether colloidal solutions are homogeneous or heterogeneous.
HARD
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 2 - Is Matter Around Us Pure>Very Short Answer Type Questions>Q 5
What is the most common way of expressing the concentration of a solution?