Mixtures, solutions, suspensions, colloids, separation techniques.
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Q1 · Is Matter Around Us Pure? · EASY
A student mixed salt and sand in water and stirred well. Salt dissolved completely but sand settled at the bottom. After some time, the student poured the liquid carefully into another beaker without disturbing the sand. Which separation technique did the student use?
Q2 · Is Matter Around Us Pure? · MEDIUM
A colloid is prepared by mixing substance X in water. When a beam of light is passed through this mixture in a dark room, the path of light becomes visible. However, when the same light beam is passed through a salt solution, the path is not visible. What property of colloids is demonstrated here?
Q3 · Is Matter Around Us Pure? · HARD
A mixture contains ammonium chloride, sodium chloride, and sand. To separate this mixture completely, a student plans the following steps: (I) Dissolve the mixture in water and filter (II) Heat the filtrate to dryness (III) Heat the original mixture before adding water. Which sequence of steps will achieve complete separation of all three components in pure form?
Q4 · Is Matter Around Us Pure? · MEDIUM
A student wants to separate a mixture of common salt and ammonium chloride. Which method would be most suitable?
Q5 · Is Matter Around Us Pure? · EASY
Which of the following represents a homogeneous mixture?