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 The glow of yellow phosphorous as is result of slow oxidation in air is called. Luminescence Chemiluminescene Bioluminescence Photolysis
2 The emission of light in a biological reaction is known as Fluorescence Phosphorescence Bioluminescence Photolysia
3 The emission of light in a biological reaction in known as. Fluorencence Phosphoreacence Biolumineacence Phtolysis
4 The branch of chemistry dealing with the study of reactions in the Uv visible region of the spectrum in known as. Kinetics Photo chemistry Surface chemistry Catalysis
5 The experimental relationship between rate of the reaction and concentration of the reactants is called. Rate law Law of mass action Le-Chatelier's principle Rate constant
6 Which of the following statement is not related to collision theory. Molecules must collide with each other to do a chemical reaction Molecules must posses a minimum amount of energy Molecules must have proper orientation Collision theory is applicable to liquid only.
7 Which of the following is not a true characteristics of a catalytic reaction. The amount and chemical composition of the catalyst remains unchanged after the reaction The catalyst does not intiate a chemical reaction The reaction in which product also act as catalysis are called autocratically reactions. The catalyst shifts the equilibrium position of a reaction in a favorable direction
8 In the kinetic study of a reaction A _____________ products.
A straight line was observed when a graph between time and 1/C2 was plotted. the reaction is.
 Second order First order Third order Zero order
9 The large increase in the rate of a reaction on rise in temperature is due to. The lowering of activation energy The decreases in mean free path The increase in collision frequency The increase in the number of molecules having more than the threshold energy
10 A catalyst increases the rate of a reaction because. It provides the necessary energy to the colliding molecules to cross energy barrier It decreases the heat of the reaction It decreases the order of the reaction It provides a different path of lower activation energy.
11 The half life period of any first order reaction. Is half the specific rate constant Is independent of the initial concentration Is always the same whatever the reaction Is directly proportional to the initial concentration of the reactant
12 They hydrolysis of methly acetate is a reaction of. First order Second order Third oirder Fourth order
13 For a chemical reaction A ___________ produce, the rat of the reaction doubles when the concentration of A is increased by 4 times the order of the reaction is. 0 1 1/2 4
14 The minimum amount of energy that the reacting molecules must posses at the time of collations in under to produce effective collisions is called. Free energy Threshold energy Activation energy External energy
15 Point out the incorrect statement. Rate law is an experimental fact whereas law of mass action is a theoretical in nature. Rate law is always different from the expression of law of mass action Rate law is more informativeness than law of mass action Order of the reaction is equal to the sum of the exponents of concentration terms in the case law.
16 Which of the following statement about molecularity is not correct. It cannot be fraction It can be obtained from balanced equation It may be or may not be equal to the order of the reaction it can not be more than 3
17 Which of the following is an acceptable value fo the molecularity. 0 2 6 3/2
18 For an elementary reaction
2A + B ------------------- C + D
The molecularity of the reaction is.
 1 2+ 3 4
19 The second order rate constant can have units. dm-6 mol 2 s-1 dm3 mol s-1 dm<sup>3</sup> mol<sup>-1</sup> s<sup>-1</sup> dm6 mol-1 s-1
20 The rate constant for 3rd order reaction has the dimentions of. mol-2 s-1 I2 mol-2 s-1 mol I -1 s-1 I-1 mol -1 s-1
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