PPSC Chemistry Part IV Analytical Chemistry Online Test With Answers

PPSC Chemistry Part IV Analytical Chemistry Online Test

Sr. # Questions Answers Choice
1 When to a solution of weak electrolyte a strong electrolyte with a common ion is added, the dissociation of weak electrolytes is suppressed . This is known as. Stark effect Salt effect Common ion effect Zeman effect
2 In second group of inorganic qualitative analysis, the S2-ions does not form precipitate with which of the following ions. <sup>Hg2+</sup> Cu<sup>2+</sup> Ai<sup>3+</sup> Cd<sup>3+</sup>
3 Which of the following statement is not correct regarding dissociation constant (Ka)? It is a measure of the tendency of an acid to split up into ions The greater the value of Ka, more is the dissociation It is determined by conductimetric method It is not a proper parameter for weak acids
4 Which of the following is not strong electrolytes. HCl H2SO4 HNO3 CH3COOH
5 Which of the following substance is not weak electrolyte. CH3COOH NH4OH Oxalic Acid NaCl
6 In order to increase the rate of the reaction one should. Increase the concentration of products Decrease the concentration of reactants Decreases the concentration of products Both C and D statement are correct
7 If a chemical reaction in equilibrium is subjected to a change the reaction tends to more in such a direction that the effect of the change would be neutralized This is a statement of. Law of mass action Le Chatlier's principle Henery's law Correspondence principle
8 The equilibrium constant value for a chemical reaction is 5 x 1020which of the following statement is true with respect to this value. Reaction will be reversible Reaction will proceed in backward direction Reaction is at equilibrium Reaction will proceed in the forward direction
9 The rate of a chemical reaction is proportional to the product of the active mean of the reactants, This is a statement of. Law of dynamic equilibrium Le Chatlier's principle Law of mass action Solubility product principle
10 Which of the following test to used to find out whether the observed data differ significantly from the one obtained from theoretical distribution. Chi square test F -Test Student's test Coefficient of variance
11 If the values of standrd deviations for the first and second method differ, then which of the following test helps one to know whether this difference is significant. Student's test F-Test Chi square test Standard deviation
12 Suppose a sample is analyzed for a particular constituent by two different method One can tell whether the two average values are significantly different by applying which of the following test. Student's test F test Chi square test Variance
13 Deviation in a particular measurement is the difference between the measured value and the average value The arithmetic mean of the different deviations observed in several measurements of the same quantity is known as. The standard deviation The average deviation Relative mean deviation variance
14 The relative error is usually expressed as Parts per ten Parts per one Parts per hundred Botha C and D
15
The number 7.43 is rounded to
 7,44 7.4 7.45 7.3
16 The number 7.65 is rounded to. 7.6 7.7 7.5 7.8
17 The number 8.47 is rounded to 8.5 8.4 8.7 8.6
18 The proper number of significant figures in the number 0.0780 is. 3 1 4 2
19 The number of significance figures in the number 80.7 is. 1 2 3 4
20 The number of significant figures in the number 0.216 is 1 2 3 <strike>4</strike>
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