During a thunderstorm, one observes lightning first and then hears the thunder, though both occur simultaneously. This is because

• light travels slower than sound

• light travels faster than sound

   

• eyes are more sensitive than ears

• none of the above

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).