Identify the solutions among the following mixtures. (c) Air

Explain the following giving examples. (b) Pure substance

Which of the following materials fall in the category of a “pure substance”? (g) Brick

Which of the following will show “Tyndall effect”? (c) Copper sulphate solution

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).

(a) What mass of potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 grams of water at 313 K?

Which of the following will show “Tyndall effect”? (d) Starch solution

Which of the following are chemical changes? (c) Mixing of iron filings and sand

Explain the following giving examples. (d) Suspension

Identify the solutions among the following mixtures. (e) Soda water

Which of the following are chemical changes? (b) Rusting of iron

Which of the following materials fall in the category of a “pure substance”? (i) Air

Which separation techniques will you apply for the separation of the following? (a) Sodium chloride from its solution in water

Classify the following into elements, compounds and mixtures. (e) Calcium carbonate

Which separation techniques will you apply for the separation of the following? (g) Tea leaves from tea

Which separation techniques will you apply for the separation of the following? (f) Oil from water

Which separation techniques will you apply for the separation of the following? (b) Ammonium chloride from a mixture containing sodium chloride and ammonium chloride

Classify the following into elements, compounds and mixtures. (l) Carbon dioxide

Identify the solutions among the following mixtures. (a) Soil

Which of the following materials fall in the category of a “pure substance”? (c) Iron

Classify the following into elements, compounds and mixtures. (k) Methane