Environmental Chemistry
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Environmental Chemistry
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25 Questions

1. Buffer solutions have constant acidity andalkalinity because
2. The solubility product of a sparingly solublesalt BA2 is 4 × 10-“12The solubility of BA 2 is
3. Among boron trifluoride - stannic chlorideand stannous chloride - Lewis acid is representedby
4. The pH value of blood does not appreciablychange by a small addition of an acid or a base - because the blood
5. Which of the following is/are the hazardouspollutant present in automobile exhaust gases?N 2 (ii) CO(iii) CH4 (iv) Oxides of nitrogen [1996]
6. Equal volumes of three acid solutions of pH 3 - 4 and 5 are mixed in a vesselWhat will be theH+ ion concentration in the mixture?
7. The pH value of a 10 M solution of HCl is
8. Which of the following pairs constitutes abuffer?
9. Which of the following molecules acts as aLewis acid?
10. The compound whose aqueous solution has the highest pH is
11. The greenhouse effect is because of the[1996]
12. Green chemistry means such reactions which:[2008]
13. The rapid change of pHnear thestoichiometric point of an acid-base titration isthe basis of indicator detectionpHof thesolution is related to ratio of the concentrationsof the conjugate acid (HIn) and base (In-“ ) formsof the indicator by the expression
14. What is the H + ion concentration of asolution prepared by dissolving 4 g ofNaOH(Atomic weight of Na = 23 amu) in 1000ml?
15. Solution of 0.1 NNH 4OH and 0.1 NNH 4Cl haspH 9.25Then find out pK b of NH 4OH
16. The ionization constant of ammoniumhydroxide is 1.77 × 10 -“5 at 298 KHydrolysisconstant of ammonium chloride is:
17. A base when dissolved in water yields asolution with a hydroxyl ion concentration of 0.05 mol litre -1 The solution is
18. At 100° C the K w of water is 55 times itsvalue at 25°CWhat will be the pHof neutralsolution? (log 55 = 1.74)
19. Which one of the following statements regarding photochemical smog is not correct?[2012]
20. Which one of the following molecularhydrides acts as a Lewis acid?
21. Aqueous solution of acetic acid contains
22. Which one of the following statement is nottrue? [2011]
23. Which of these is least likely to act as Lewisbase?
24. Equimolar solutions of the following substances were prepared separately. Whichone of these will record the highest pHvalue?
25. A physician wishes to prepare a buffersolution of pH= 3.58 that efficiently resists achange in pHyet contains only small concentrations of the buffering agents. Which one of the following weak acids together with its sodium salt would be the best to use?

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