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Published on: 03/07/2021
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Questions + Answers key
Take MCQ Science Test1.
Define trinary solution
2.
What are the liquids present in human body?
3.
7.5 litre of ethanol is present in 15 litre of aqueous solution of ethanol. Calculate volume percent of ethanol solution.
4.
Calculate the percent by mass of glucose in a solution made by dissolving 500 g of glucose in 50 g of water.
5.
60 grams of NaOH is dissolved in 120 grams of water at 250 C to form a saturated solution. Find mass percentage of solute and solvent.
1.
Two solutes are dissolved in one solvent. Such kind of solutions which contain three components are called trinary solutions.
2.
Most of the liquids found in human body including blood, lymph and urine are solutions.
3.
Volume percentage = \(\frac{Volume \ of \ the \ solute}{Volume \ of \ the \ solution}\)
= \(\frac{7.5}{15}\) x 100 = 50%
4.
Mass percentage = \(\frac{Mass \ of \ the \ solute}{Mass \ of \ the \ solute \ + \ Mass \ of \ the\ solvent}\) x 100
= \(\frac{500}{500+50}\) x 100
= \(\frac{500}{550}\) x 100
= 90.90%
5.
(i) Mass percentage = \(\frac{Mass \ of \ the\ solute}{Mass \ of \ the \ solute \ + \ Mass \ of \ the \ solvent}\) x 100
= \(\frac{60}{60+120}\) x 100
= \(\frac{60}{180}\) x 100
Mass percentage of solute = 33.33%
(ii) Mass by mass % of solvent
= 100 - [Mass by mass % of solute]
= 100 - 33.33
= 66.67
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Tamilnadu Stateboard 10th Standard Subjects
Tamilnadu Stateboard Standards
