Some Basic Concepts of Chemistry-Class-11-MCQ

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1) A solution of crystalline oxalic acid is prepared by dissolving 0.63g of H2C2O4. 2H2O in 250 cc of solution. The molarity and normality of the solution is- 0.02, 0.02 0.02, 0.04 0.04, 0.02 0.04, 0.04

2) 214.2 g of an aqueous solution of sugar contains 34.2 g f sugar. If molecular mass of sugar is 342, calculate the molarity of the solution. 0.55 0.66 0.44 0.33

3) The density of 3 M solution of NaCl is 1.25 g/mL. Calculate the molality of solution. 7.65 3.33 2.79 6.34

4) An aqueous solution solution of HCl is 38% by mass and its density 1.19g/mL. Calculate the molality and molarity of the solution. 16.79, 12.39 20.77, 28.76 11.7, 87.56 45.87, 99.45

5) A sample of sulphuric acid contains 13% sulphuric acid by mass and its density is 1.02g/mL. Calculate the molality, molarity and normality of this sample. 5.6, 8.9, 2.6 1.52, 1.35, 2.7 3.5, 7.4, 2.5 2.6. 6.5, 5.5

6) 6.9 M KOH solution contains 30% KOH by mass. Calculate the density of the solution. 3.889 1.888 3.78 1.288

7) Calculate the mole fraction of ethylene glycol in a solution containing 20% of C2H6O2 by mass. 0.023 0.076 0.068 0.044

8) 25mL of N/20 oxal;ic acid are completely oxidised by 20 mL of KMnO4 solution in acidic medium. Calculate the strength of the solution in normality and g/L. 1/16, 1.97 1/8, 4.76 1/4, 2.66 1/2, 4.66

9) 0.45 g of anhydrous oxalic acid require 50mL of KMnO4 solution for complete oxidation in acid medium. What is the normality of KMnO4 solution. 0.2 0.4 o.6 0.5

10) 3.15 g of an acid are dissolved in water and volume of solution is made 500mL by adding water. 20 mL of this solution required 20 mL of N/10 NaOH solution. If the acid is dibasic, then calculate the molar mass of the acid. 450 345 225 126

11) Molar mass of an acid is 90. 0.75 g of this acid require 16.6 mL of N NaOH for complete neutralisation. Calculate the basicity of the acid. 4 2 3 1

12) 1.22g of a mixture containing Na2CO3 and K2CO3 are present in 100 mL aqueous solution. 20 mL of this solution is completely neutrlised by 40 mL of 0.1 N HCl. Calculate the mass of Na2CO3. 0.77g 0.53g 0.95g 0.15g

13) 2.013 g of a mixture contains NaOH and Na2CO3. This mixture is dissolved and volume is made one litre by adding water. 20mL of this solution requires 10 mL of 0.1 N sulphuric acid for complete neutralisation. What is the percentage of Na2CO3 by mass in the mixture. 1.76 76.9 2.63 65.8

14) 1.25 g of a mixture of sodium carbonate and sodium sulphate is present in 250 mL aqueous solution. 25 mL of this solution is completely neutralised by 20 mL of 0.1 N sulphuric acid. Calculate the % of sodium carbonate. 84.8% 23.56% 13.98% 66.88%

15) 0.5 g of a sample of limstone is dissolved in 30 mL of 0.1 N HCl and volume of the solution is made 100 mL by addingf water. 25 mL of this solution requires 12.5 mL of N/25 NaOH for neutralisation. Calculate the % of CaCO3 in limestone. 20 10 15 25

16) Normality of an aqueous solution containing HCl and H2SO4 is N/5. 20 mL of this solution is treated with excess of AgNO3 solution when 0.287g of precipitate of AgCl is obtained. Calculate the normality of H2SO4. 0.4 0.3 0.2 0.1

17) 10mL solution of sulphuric acid and HCl is neutralised completely by 16 mL of N/8 NaOH. Now 20 mL of another same acid solution on treatment with excess of BaCl2 solution gives 0.3501 g of BaSO4 precipitate. What is the normality of H2SO4 and HCl. 0.15 and 0.05 0.25 and 0.15 0.56 and 0.65 0.45 and 0.65

18) 2.74g mixture of Sodium carbonate and sodium bicarbonate on strong heating givs 224 mL CO2 at STP. What is the % of sodium bicarbonate in the mixture. 35.5 31.61 61.31 55.3

19) 1g sample of washing soda (Na2CO3. x H2O) WAS DISSOLVED IN 50 mL of 1.0M HCl. The excess acid required 21.13 mL of 1.018 M the Ba(OH)2 solution for neutralisation. Determine the value of 'x' in the sample of washing soda. 4 6 8 10

20) Iodine (I2) is dissolved in benzene. Mole fraction of I2 in benzene solution is 0.2. Calculate the molality of the solution. 3.205 6.852 9.876 3.987

21) The solubility of Ba(OH)2. 8 H2O is 5.6 g per 100 g of water. What is the molality of the OH- ions in the saturated solution of barium hydroxide? 0.765 0.356 0.456 0.987

22) 50 mL of 0.01 N Oxalic acid requires x mL of 0.01 M KMnO4 in acidic medium for complete oxidation. Calculate the value of x. 15 10 25 20

23) For complete oxidation of 100 mL of N/20 ferrous ammonium sulphate , x mL of 0.5 M K2Cr2O7 solution is required inh acidic medium. calculate the value of x. 2.87 1.66 3.99 6.98

24) 0.3 g of an acid is neutralised by 40 mL of 0.125 N NaOH. Equivalent mass of the acid is- 50 60 40 90

25) When a metal is burnt in oxygen , its weight is increased by 24 %. The equivalent weight of the metal will be- 40 50 30 60

26) What volume of 10% solution of Na2CO3 will be required to neutralise 100 mL of HCl solution containing 3.65 g of HCl? 134.8mL 177.77mL 106.4mL 165.9mL

27) 20 cc of 1.0M CaCl2 and 60cc of 0.2 M CaCl2 are mixed. What will be the molarity of the final solution? 0.9 0.7 0.4 0.1

28) A mixture of formic acid and oxalic acid is heated is heated with conc sulphuric acid. The gas produced is collected and on its treatment with KOH solution, the volume of the gas decreased by 1/6 th. Calculate the molar ratio of the two acids in the original mixture. 4:1 2:3 3:1 1:4

29) A solid mixture weighing 5g containing lead nitrate and sodium nitrate was heated below 600 degree Celsius until the mass of the residue was constant. If the loss of mass is 28%, find the mass of led nitrate in the mixture. 4.55 3.33 5.55 6.66

30) What is the molarity of water if its density is 1000kg/m3 55.56 5.56 0.56 555.56

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