Chemistry_Class-12_Ch-1_Solution_Topic-2_Method of Expressing Concentration of Solution

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1. The amount of anhydrous Na₂CO₃ present in 250 mL of 0.25 M solution is

A) 6.225 g

B) 66.25 g

C) 6.0 g

D) ) 6.625 g

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2. What will be the molarity of a solution containing 5 g of sodium hydroxide in 250 ml solution.

A) 0.5

B) 1.0

C) 2.0

D) 0.1

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3. The molarity of a solution made by mixing 50mL of conc. H2SO4 (36N) with 50 mL of water is

A) 36 M

B) 18 M

C) 9 M

D) 6 M

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4) Two solutions of a substance (non electrolyte) are mixed in the following manner .480 mL of 1.5M first solution + 520 mL of 1.2M second solution. What is the molarity of the final mixture

A) 1.20 M

B)1.50 M

C) 1.344 M

D) 2.70 M

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5) 10.6 grams of a substance of molecular weight 106 was dissolved in 100mL. 10mL of this solution was pipetted out into a 1000mL flask and made up to the mark with distilled water. The molarity of the resulting solution is

A) 1.0 M

B) 10⁻² M

C) 10⁻³ M

D) 10⁻⁴ M

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6) To prepare a solution of concentration of 0.03 g/mL of AgNO3, what amount of AgNO3, should be added in 60 mL of solution

A) 1.8

B) 0.8

C) 0.18

D) None of these

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7). Which of the following concentration is affected by change in temperature

A) Molarity

B) Molality

C)Mole fraction

D) Weight fraction

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8. The molarity of a solution of Na₂CO₃ having 10.6g/500mL of solution is

A) 0.2M

B) 2M

C) 20M

D) 0.02M

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9) An aqueous solution of glucose is 10% in strength. The volume in which 1 mole of it is dissolved will be

A) 18 litre

B) 9 litre

C) 0.9 litre

D) 1.8 litre

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10) The concentration of an aqueous solution of 0.01M CH3OH solution is very nearly equal to which of the following

A) 0.01% CH₃OH

B) 0.01m CH₃OH

C) x CH₃OH = 0.01

D) 0.01N CH₃OH

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11) 6.02 × 10²⁰ molecules of urea are present in 100 mL of its solution. The concentration of urea solution is:

A) 0.02 M

B) ) 0.01 M

C) 0.001 M

D) ) 0.1 M

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12) 40% by weight solution will contain how much mass of the solute in 1 L solution, density of the solution is 1.2 g/mL

A) 480 g

B) 48 g

C) 38 g

D) 380 g

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13. What is the molarity of H2SO4 solution, that has a density 1.84 g/cc at 35◦ C and contains solute 98% by weight

A) 4.18 M

B) 8.14 M

C) 18.4 M

D) 18 M

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14. For converting a solution if concentration into a solution of The quantity of water added is 100 mL KCI of 0.4 M KCI, 0.05 M concentration.

A) 900 mL

B) 700 mL

C) 500 mL

D) 300 mL

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15) The molarity of a solution obtained by mixing 800 mL of 0.5 M HCl with 200 mL of 1 M HCI will be

A) 0.8 M

B) 0.6 M

C) 0.4 M

D) 0.2 M

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16) Dissolving 120g of urea (mol. wt. 60) in 1000g of water gave a solution of density 1.15g/mL. The molarity of the solution is

A) 1.78 M

B) 2.00 M

C) 2.05 M

D) 2.22 M

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17) In which ratio of volumes 0.4 M HCl and 0.9 M HCI are to be mixed such that the concentration of the resultant solution becomes 0.7 M

A) 4:9

B) 2:3

C) 3:2

D) 1:1

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18. How many grams of glucose be dissolved to make one litre solution of 10% glucose

A) 100 g

B) 180 g

C) 18 g

D) 1.8 g

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19) 8.50 g of NH3 is present in 250 mL volume. Its active mass is

A) 1.0 mol L⁻¹

B) 0.5 mol L⁻¹

C) 1.5 mol L⁻¹

D) 2.0 mol L⁻¹

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20) 20 mL of HCI solution requires 19.85 mL of 0.01 M NaOH solution for complete neutralization. The molarity of HCI solution is

A) 0.0099

B) ) 0.099

C) 0.99

D) 9.9

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21. If 5.85 g of NaCl (molecular weight 58.5) is dissolved in water and the solution is made up to 0.5 litre, the molarity of the solution will be

A) 0.2

B) 0.4

C) 1.0

D) 0.1

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22) Which statement is true for solution of 0.020 M H₂SO₄

A) 2 litre of the solution contains 0.020 mole of SO₄-²

B) 2 litre of the solution contains 0.080 mole of H₃O⁺

C) 1 litre of the solution contains 0.020 mole of H₃O⁺

D) None of these

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23) 25 mL of a solution of barium hydroxide on titration with a 0.1molar solution of hydrochloric acid gave a titre value of 35 mL. The molarity of barium hydroxide solution was

A) 0.07

B) 0.14

C) ) 0.28

D) ) 0.35

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24) 3.0 molal NaOH solution has a density of 1.110 g/mL. The molarity of the solution is

A) 3.0504

B) 3.05

C) 2.9732

D) 3.64

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25. Which of the following should 0.40M NaCI starting with 100 ml of 0.30M NaCI [BIT 1992] (mol.wt. of NaCl = 58.5)

A) Add 0.585 g NaCl

B) ) Add 20 ml water

C) Add 0.010 mL NaCl

D) vaporate 10 mL water

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26. The density of a 3M solution is 1.25g/mL. sodium thiosulphate (Na2S2O3) Calculate the percent by weight of

A) 12.64%

B) 37.92%

C) 0.87%

D) 63.21%

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27. Concentrated Aqueous solution sulphuric acid 98% H₂SO₄ by mass and has a density of 1.80 g.ml-1 . Volume of acid required to make 1 litre of 0.1 MH₂SO₄ solution

A) 11.10 mL

B) 16.65 ml

C ) 22.20 mL

D) 5.55 ml

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28. What is molarity of a solution of HCl which contains 49% by weight of solute and whose specific gravity is 1.41

A) 15.25

B) 16.75

C) 18.92

D) 20.08

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29. The molarity of pure water is

A) 55.6

B) ) 100

C) 5.56

D) 18

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30. If 500 mL of a 5 M solution is diluted to 1500 mL, what will be the molarity of the solution obtained

A) 1.5 M

B) 1.66 M

C) 0.017 M

D) 1.59 M

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