English Medium कक्षा ९ - CBSE Question Bank Solutions for Science

Suggest separation technique(s) one would need to employ to separate the following mixture.

Potassium chloride and ammonium chloride

Suggest separation technique(s) one would need to employ to separate the following mixture.

Common salt, water and sand

Suggest separation technique(s) one would need to employ to separate the following mixture.

Kerosene oil, water and salt

The ‘sea-water’ can be classified as a homogeneous as well as a heterogeneous mixture. Comment.

While diluting a solution of salt in water, a student by mistake added acetone (boiling point 56°C). What technique can be employed to get back the acetone? Justify your choice.

What would you observe when

a saturated solution of potassium chloride prepared at 60°C is allowed to cool to room temperature.

What would you observe when

an aqueous sugar solution is heated to dryness.

What would you observe when

a mixture of iron filings and sulphur powder is heated strongly

Name the process associated with the following

Settling of sand when a mixture of sand and water is left undisturbed for some time.

You are given two samples of water labelled as ‘A’ and ‘B’. Sample ‘A’ boils at 100°C and sample ‘B’ boils at 102°C. Which sample of the water will not freeze at 0°C? Comment.

Give an example of each mixture having the following characteristics. Suggest a suitable method to separate the components of this mixture

Two volatile components with appreciable differences in boiling points.

A colloid is a ______ mixture and its components can be separated by the technique known as ______.

A mixture of chloroform and water are taken in a separating funnel is mixed and left undisturbed for some time. The upper layer in the separating funnel will be of ______ and the lower layer will be that of ______.

A mixture of two or more miscible liquids, for which the difference in the boiling points is less than 25 K can be separated by the process called ______.

Sucrose (sugar) crystals obtained from sugarcane and beetroot are mixed together. Will it be a pure substance or a mixture? Give reasons for the same.

Can we separate alcohol dissolved in water by using a separating funnel? If yes, then describe the procedure. If not, explain.

Under which category of mixtures will you classify alloys and why?

You are provided with a mixture containing sand, iron filings, ammonium chloride and sodium chloride. Describe the procedures you would use to separate these constituents from the mixture?

A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goalkeeper to

A horse continues to apply force in order to move a cart with a constant speed. Explain why?