Unit8 Ionic equilibrium qns

Unit8 Ionic equilibrium qns - 1 UNIT 8 IONIC EQUILIBRIUM...

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1 QUEST TUTORIALS Head Office : E-16/289, Sector-8, Rohini, New Delhi, Ph. 65395439 UNIT 8 IONIC EQUILIBRIUM SECTION – A 1. Which one of the following would be the strongest Bronsted acid in aqueous solution? (a) HClO 4 (b) H 2 SO 4 (c) HNO 3 (d) HI 2. Which one of the following would be the strongest Bronsted and Lewis base ? (a) CN (b) C 6 H 5 O (c) OH (d) C 2 H 5 O 3. In the reaction F – B + : N – H F 3 B :N – H BF 3 is (a) electron –pair acceptor (b) Lewis acid (c) electron dificient molecule and electrophile (d) all of these 4. Which of the following would be the strongest Lewis base ? (a) NH 2 ( b) C –C C (c) C 2 H 5 O (d) CH 3 5. The molarity of pure water (d = 0.997 g/ml) at 25ºC is (a) 18 (b) 1.82 × 10 –16 (c) 55.4 (d) 1 × 10 –14 6. pH (puissance de hydrogen) of ).2 M H 2 SO 4 (assuming complete dissociation ) is (a) 1.0 (b) 0.4 (c) 0.6 (d) 1.4 7. Assuming complete ionisation, the pH of 0.1 M HCl is 1.0. The molarity of H 2 SO 4 with the same (a) 0.1 (b) 0.2 (c) 0.5 (d) 0.05 8. pH of 10 –8 M HCl is (a) 8 (b) 7 (c) between 7 and 8 (d) between 6 and 7 9. 500 ml of 0.2 M H 2 SO 4 and 250 ml of 0.1 M Ba(OH) 2 are mixed. The pH of resulting solution is (a) 7 (b) 0.7 (c) 1.6 (d) 0.3 10. pH of M/200 Ba(OH) 2 solution (assuming complete dissociation) is (a) 2 (b) 12 (c) 12.70 (d) 11.6 11. How many grams of HCl must be added to 200 ml of water to give a solution of pH =2.70 ? (a) 0.146 (b) 0.292 (c) 0.0146 (d) 0.073 12. pH of 0.2 M H 2 SO 4 is (a) 0.40 (b) 0.70 (c) 2.0 (c) 1.30 13. 500 ml of 0.2 M H 2 SO 4 are mixed with 250 ml of 0.1 M Ba(OH) 2 , pH of solution is closest to (a) 0.40 (b) 0.70 (c) 1.30 (d) 13.30 14. The conjugate base of NH 4 + is (a) NH 3 (b) NH 4 OH (c) NH 2 (d) OH 15. The pH of a saturated solution of Ca(OH) 2 in water at 25ºC is 12.67. What is the (OH ) concentration? (a) 67 . 12 10 14 - (b) 67 . 12 14 10 10 - (c) 67 . 12 14 10 10 - - (d) 67 . 12 17 10 14 × 16. If the concentration of OH in the solution of Ca(OH) 2 x molar, the solubility of Ca(OH) 2 (a) x/3 (b) x/2 (c) x (d) 2x 17. pH of 0.02 M HClO 4 (a) 1.0 (b) 1.70 (c) 12.70 (d) 7 18. The pH of a solution made by dissolving 0.28 g of KOH and diluting to 500 ml is (a) 2 (b) 12 (c) 13 (d) 0 19. 50 ml of 0.1 M HCl are added to 50 ml of 0.1 M NaOH, the pH of solutions would be nearly (a) 0 (b) 7 (c) 14 (d) 5
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2 QUEST TUTORIALS Head Office : E-16/289, Sector-8, Rohini, New Delhi, Ph. 65395439 20. A solution with pH = 2 is more acidic than a solution with a pH = 6 by a factor of (a) 4 (b) 8 (c) 400 (c) 10,000 21. What is the pH of a solution made by diluting 50 ml of KOH (28% by weight and density 1.3 g/cc) to 2 litres ? (a) 13.21
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Unit8 Ionic equilibrium qns - 1 UNIT 8 IONIC EQUILIBRIUM...

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