1 year chemistry n0tes new st CHAPTER 8 CHEMICAL EQUILIBRIUM MCQs Q.1 A reaction is reversible because (a) reactants are reactive (b) products are

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1 year chemitry n0te new t CHAPTER 8 CHEMICAL EQUILIBRIUM MCQ Q.1 A reaction i reverible becaue reactant are reactive (b) product are reactive (c) product are table (d) reactant are table Q.2 A large value of Kc mean that at equilibrium le reactant and more product (b) more reactant and le product (c) ame amount (d) none Q.3 Extent to H2 + I2 2HI can be increaed by increaing preure (b) increaing product (c) increaing temp (d) adding a catalyt Q.4 Strength of an acid can be determined by PKa (b) PKp (c) POH (d) PKw Q.5 In an exothermic reverible reaction increae in temp hift the equilibrium to reactant ide (b) product ide (c) remain unchanged (d) none Q.6 Unit of Kw are mole dm 3 (b) mole2 dm 3 (c) mole2 dm 6 (d) mole2 dm 3 Q.7 A baic Buffer olution can be prepared by mixing (b) (c) (d) weak acid and it alt with trong bae trong acid and it alt with weak bae weak bae and it alt with trong acid trong bae and it alt with weak acid Q.8 Buffer action can be explained by common ion effect (b) law of ma action 1

2 year chemitry n0te new t (c) Le Chatlier principle (d) all above Q.9 Ionization of weak acid i expreed in term of following contant Kw (b) Kn (c) Ka (d) Kb Q.10 Solubility of Ca(OH)2 i exothermic. If olubility will increae at high temp (b) at low temp (c) temp independent (d) none Q.11 For which ytem doe the equilibrium contant, Kc ha unit of concentration N2 + 3H2 2NH3 (b) H2 + I2 2 HI (c) 2NO2 N2O4 (d) 2HF H2 + F2 Q.12 Which tatement about the following equilibrium i correct 2SO2(g) + O2(g) 2SO3(g) H = kj mol 1 the value of Kp fall with a rie in temp (b) the value of Kp fall with increaing preure (c) adding V2O5 catalyt increae the equilibrium yield of ulphur trioxide (d) the value of Kp i equal to Kc Q.13 The PH of 10 3 mole dm 3 of an aqueou olution of H2SO4 i 3.0 (b) 2.7 (c) 2.0 (d) 1.5 Q.14 The olubility product of AgCl i 2.0 x mole2 dm 6. The max concentration of Ag+ ion in the olution i 2.0 x mol dm 3 (b) 1.41 x 10 5 mol dm 3 (c) 1.0 x mol dm 3 (d) 4.0 x mol dm 3 Q.15 An exce of aqueou ilver nitrate to added to aqueou barium chloride and precipitate i removed by filtration what are the main ion in the filtrate Ag+ and NO only (b) Ag+ and Ba2+ and NO3 (c) Ba2+ and NO only (d) Ba+2 and NO and Cl Q.16 For N2 + 3H2 2NH3 Kc = Kp (b) Kp = Kc RT 2

3 year chemitry n0te new t (c) Kp = Kc (RT) 2 (d) Kp = Kc (RT) 1 Q.17 H2 + I2 2HI In the above equilibrium ytem, if the conc. of reactant of 25oC i increaed, the value of Kc will increae (b) decreae (c) remain contant (d) depend upon nature of reactant Q.18 In a chemical reaction, equilibrium i aid to have etablihed when oppoing reaction top (b) concentration of reactant and product are equal (c) rate contant of oppoing reaction are equal Q.19 The relation between Kc and Kp i Kc = Kp (RT) n (b) Kp = Kc (RT) n (c) Kp = Kc (RT) n (d) Kp = Kc Q.20 The precipitation occur if the ionic concentration i le than Kp (b) more than Kp (c) equal to Kp (d) i preent at any moment Q.21 The PH of orange i 3.5 (b) 3.1 (c) 4.6 (d) 4.2 Q.22 Which one of following olution have zero PH 1M HCl (b) 0.5 MH2SO4 (c) 0.1 M HNO3 (d) 1M CH3COOH Q.23 The olubility product expreion for BaF2 can be written a [Ba2+] [F ] (b) [Ba2+] [2F] (c) [Ba2+] [F ]2 (d) [Ba+] [F ]2 Q.24 To prepare a buffer with PH cloe to 9.0, you could ue a mixture of (b) (c) (d) NH4OH and NH4Cl CH3COOH and CH3COONa HNO2 + NaNO2 NaHCO3 + H2CO3 3

4 year chemitry n0te new t Q.25 For which reaction the numerical value of Kc and Kp are ame N2 + 3H2 2NH3 (b) 2SO2 + O2 2SO3 (c) H2 + Cl2 2HCl (d) N2O4 2NO2 Q.26 For which ytem doe the equilibrium contant Kc have unit (mole dm 3) 1 H2 + I2 2HI (b) N2 + 3H2 2NH3 (c) 2NO2 N2O4 (d) CH3COOH + C2H5OH CH3COOC2H5 + H2O Q.27 What can affect the magnitude of equilibrium contant Kp of a reverible gaeou reaction temperature (b) preure (c) catalyt (d) none of above Q.28 Which ga can change the PH toward acidic argon (b) carbon dioxide (c) nitrogen (d) oxygen Q.29 The olution having zero PH will be baic (b) high baic (c) neutral (d) highly acidic Q.30 A olution have H+ ion concentration 1 x 10 7 it PH will be acid (b) baic (c) neutral (d) zero Q.31 Which one of the following ha highet PH 0.1 M HCl (b) 1.0 M HCl (c) gatric juice (d) lemon Q.32 Which PH i conidered a baic 1 (b) 7 (c) 2 (d) 11 Q.33 The um of PH and POH i 2 (b) 7 (c) 14 (d) 13.5 Q.34 A buffer olution can be prepared by mixing a trong acid and weak bae 4

5 year chemitry n0te new t (b) a weak acid and weak bae (c) a trong acid and it alt (d) a weak bae and it alt with trong acid Q.35 Law of ma action wa preented by Henderon (b) Lewi (c) Guldberg and Waage (d) Arreheniu Q.36 The unit of Kc for reaction N2 + O2 2NO mol dm 3 (b) mol 1 dm3 (c) mol 2 dm6 (d) no unit Q.37 PH of pure water i 3.2 (b) 4.2 (c) 7.0 (d) 0 Q.38 Which of following change will favour the formation of more SO3 at equilibrium 2SO2 + O2 2SO3 + heat by adding SO3 at equilibrium (b) by increaing temp (c) by decreaing temp (d) by decreaing preure Q.39 When preure i applied to the given equilibrium ice water which of the following will happen more ice will be formed (b) more water will be formed (c) equilibrium will not be diturbed (d) water will formed Q.40 Which of following change will favour the formation of more HI in the given reaction H2 + I2 2HI (b) (c) increaing preure decreaing preure by adding more HI 5

6 year chemitry n0te new t (d) by adding more H2 and I2 ANSWERS Anwer b a c a A Anwer a a d c b Anwer a a b b c Anwer c a c b b Anwer a a c a c Anwer b b b d c Anwer d d c d c Anwer d c c d d 6

1 year n0tes chemistry new st CHAPTER 7 THERMOCHEMISTRY MCQs Q.1 Which of the following statements is contrary to the first law of thermodynamics?

1 year n0tes chemistry new st CHAPTER 7 THERMOCHEMISTRY MCQs Q.1 Which of the following statements is contrary to the first law of thermodynamics? year n0te chemitry new t CHAPTER 7 THERMOCHEMISTRY MCQ Q.1 Which of the following tatement i contrary to the firt law of thermodynamic? (a) energy can neither be created nor detroyed (b) one form of energy