A driver accelerates his car first at the rate of 1.8 m/s² and then at the rate of 1.2 m/s². The ratio of two forces exerted by the engine in the two cases will be

 

•  2 : 1

   

• 2 : 3

• 3 : 2.

• 1 : 2

Write the steps you would use for making tea. Use the words—solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.

Pragya tested the solubility of three different substances at different temperatures and collected the data as given below (results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution).

Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution to cool at room temperature. What would she observe as the solution cools? Explain.

Find the solubility of each salt at 293 K. Which salt has the highest solubility at this temperature?

Pragya tested the solubility of three different substances at different temperatures and collected the data as given below (results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution).

Explain the following giving examples:

Saturated solution

Explain the following giving examples:

Pure substance

Explain the following giving examples:


Colloid

Explain the following giving examples:


Suspension