Question

Q2) To make a saturated solution, 72 g of sodium chloride is dissolved in 200 g of water at 20 0 C. find its concentration at the same temperature. Q3) What is chromatography? How will you separate the components of black ink using chromatography? Write any two applications of chromatography. Q4) You are provided with solution of substance ‘X’. how will you test whether it is saturated or unsaturated with respect to ‘X’ at a given temperature? What happens when a hot saturated solution is allowed to cool? Q5) What is crystallization? Explain the activity of obtaining pure crystals from impure sample. Q6) Three students A, B and C prepared mixtures using chalk powder, common salt and milk respectively in water. Whose mixture: a)Would not leave residue on filter paper after filtration? b) Would show Tyndall effect? c) Would give transparent/ clear solution? d) Would settle down at the bottom when left undisturbed? e) Could be filtered by filter paper? Q7) Write the role of following in water purification system: (a) Sedimentation Tank(b) Loading tank(c) Chlorination tank Q8) Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100g of water? Q9) A solution contains 40 g of common salt in 320 g of water. Calculate the concentration in terms of mass by mass percentage of the solution.

Answer 1

Answer:

write the role of following in water purification system (a) sedimentation tank