PPSC Chemistry Part I Physical Chemistry Online Test With Answers

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PPSC Chemistry Part I Physical Chemistry Online Test

Sr. # Questions Answers Choice
1 A 2M solution of H2SO4 would have how many moles of H+ ion in one liter 1.0 2.0 4.0 5.0
2 The degree of dissociation of weak acid increases with. Decreasing pressure Increasing pressure Increasing concentration Decreasing concentration
3 Which of the following specie is stronger acid than formic acid, HCOOH, in aqueous solution. CH3COOH NH+4 H2SO-3 H4P2O7
4 The correct order of acid strength is. HIO4 > HBrO4 > HCIO4 HCIO4> HBrO4 > HIO4 HBrO4 > HIO4 > HCIO4 HBrO4 > HCIO4 > HIO4
5 The correct order of acidic strength is. HF < HCl< HI < HBr HI <HBr < HCl < HF HI < HBr < HF < HCl HF < HCl < HBr < HI
6 The pink colour of phenolphthalen in in basic medium is due to the Cationic form Anionic form Natural form OH- ions of the base
7 The pH of water 7 at 25 oC if water is heated to 70 oC . Which of the following should be true. pH will decrees pH will increase pH will remain constant None of these
8 Which of the following will have the largest pH? O.1 N HCl 0.1 N CH3COOH 0.1 N NaOH 0.01 N NaOH
9 The pKa of an acid having ionization constant 1 x 10-5 is -5 5 9 -9
10 Which of the following solution has pH= 11? 1 X 10<sup>-11</sup> m NaOH 1 x 10<sup>-11</sup> m HCl 1 x 10<sup> -3</sup> M NaOH 1 X 10 <sup>3</sup> M NaOH
11 The sum of pH and pOH is aqueous solution is equal to. 14 7 zero pKw
12 Which of the following statement is not correct regarding Lewis acids and bases. NH3 and H2O both behaves as Lewis bases Substances which donate a pair of electrons are called Lewis bases All Lewis bases are also Bronsted bases Lewis base must contain an atom having less than an octet of electron.
13 HS- is a conjugate base of. S2- H2S H2SO3 H2SO4
14 What of the following is not a Lewis base. CN- AlCl3 NH3 ROH
15 Which of the following can act both as a Bronsted acid and a Bronsted base. Na2CO3 OH- HCO3- NH3
16 According to Arrhenius theory an acid is defined as substance which Accepts and electron pair Donatees H+ ion in ammonia Contains Cl- ions Furnishes H3O + ion in water
17 The equilibrium constants Kp and Kc are related as Kp = Kx Pdelta n K p= Ks/P delta n Ks = Kp (RT)delta n Kx = Kp (P/RT) delta n
18 Equilibrium constant Kp and Kc are related as Kc = Kp (RT)delta n Kp = Kc (RT)an Kp = (Kc/RT)delta n Kp -Kc = (RT)delta n
19 An equilibrium the free energy change delta F for a reaction is. Maximum Minimum Zero Negative
20 Which of the following statements is not related with chemical equilirbium. The properties of the system become constant The equilibrium can be approached from either direction The chemical equilibrium is static is nature A catalyst can hasten the approach towards equilibrium
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