PPSC Chemistry Full Book Test With Answers

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PPSC Chemistry Full Book Test

Sr. # Questions Answers Choice
1 The number of moles of solute dissolved in 1000 gram of the solvent is called Formality Molality Molarity Mole fraction
2 The number of gram equivalents of the solute per dm3 of the solution is called. Formality Normality Molality Molarity
3 The number of mole of the solute dissolved per dm3 of the solution is called. Molality Formality Normality Molarity
4 A 10% solution of sucrose contains 10 g of sucrose in how much volume of the solution. 10 mL 100 mL 1000 mL 1 mL
5 If there are only two components in a solution with mole fraction XAand XBthen which of the following relation is correct. X<sub>A</sub> + X <sub>B</sub> = 0 X <sub>A</sub> + X <sub>B</sub> &gt; 1 XA = XB &lt; 1 XA = 1 - XB
6 Which of the following concentration term is used in respect of standard solutions. Normality Formality Molarity All of above
7 If 20 ml of 0.5 N salt solution is diluted in one litre. what is the new concentration. 0.01 N 0.001 N 1 N 10 N
8 Which parameter of a chemical reaction will change with the use of a catalyst. Delta F, change in free energy Delta S, change in entropy Delta E , change in internal energy K, the rate constant
9 The pKa of acetic acid is 4.74 which implies that. pH of 1N solution is 4.74 At pH 4.74 the dissociation of acetic acid is maximum At pH 4.74 half of the acetic acid molecules are dissociated in the solution. At pH 4.74 the dissociation of acetic acid is minimum.
10 Which is the following is not a buffer. H2CO3/HCO3 NH4Cl/NH4OH CH3COOH/CH3COONa NH3OH/CH3COOH
11 Which of the following is a buffer solution. CH3COOH + NH4OH CH3 COOH + HCl CH3COOH + NaOH CH3COOH + CH3COONa
12 A pH of a neutral solution at 100 oC when Kw = 1.0 x 10-12 0 7 6 7
13 A 2M solution of H2SO4 would have how many moles of H+ ion in one liter 1.0 2.0 4.0 5.0
14 The degree of dissociation of weak acid increases with. Decreasing pressure Increasing pressure Increasing concentration Decreasing concentration
15 Which of the following specie is stronger acid than formic acid, HCOOH, in aqueous solution. CH3COOH NH+4 H2SO-3 H4P2O7
16 The correct order of acid strength is. HIO4 &gt; HBrO4 &gt; HCIO4 HCIO4&gt; HBrO4 &gt; HIO4 HBrO4 &gt; HIO4 &gt; HCIO4 HBrO4 &gt; HCIO4 &gt; HIO4
17 The correct order of acidic strength is. HF &lt; HCl&lt; HI &lt; HBr HI &lt;HBr &lt; HCl &lt; HF HI &lt; HBr &lt; HF &lt; HCl HF &lt; HCl &lt; HBr &lt; HI
18 The pink colour of phenolphthalen in in basic medium is due to the Cationic form Anionic form Natural form OH- ions of the base
19 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
20 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
21 The pKa of an acid having ionization constant 1 x 10-5 is -5 5 9 -9
22 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
23 The sum of pH and pOH is aqueous solution is equal to. 14 7 zero pKw
24 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.
25 HS- is a conjugate base of. S2- H2S H2SO3 H2SO4
26 What of the following is not a Lewis base. CN- AlCl3 NH3 ROH
27 Which of the following can act both as a Bronsted acid and a Bronsted base. Na2CO3 OH- HCO3- NH3
28 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
29 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
30 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
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