ECAT Chemistry MCQ's Test For Full Book With Answers

ECAT Chemistry MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 The period table contains elements in vertical column. these vertical column are called Groups Periods Blocks Sub group
2 In the modern periodic table the elements are placed in the ascending order of their Atomic masses Melting points Boiling points Atomic numbers
3 Doberiner arranged the similar elements into Pairs Triads Triplets Rows
4 The value of activation energy Ea of a reaction can be determined from the value of slope of the straight line obtained by plotting a graph between 1/T and log k. the value of Ea is equal to Slope 1/Slope Slope x R Slope x 2.303 R
5 Which statement about Arrhenius equation is incorrect Factor 'A' called Arrhenius constant depends upon collision frequency of reactants Rate of reaction increase by increasing temperature Rate constant k is increased Activation energy Ea is decreased by rise in temperature
6 The rate constant k of a reaction activation energy Ea and temperature are related by Arrhenius in the form of an equation which is
7 With increases in temperature of 10 K of the reacting gases the rate of reaction is doubled because Increase in number of collisions Number of molecules having energy more than Ea is doubled Increase in order of reaction Increase in surface area
8 The factor which effect the rate of reaction Nature of reactants Surface area Light All of the above
9 Which of the following is not affected by light
10 Which one of the following reaction rate is effected by the light
11 The actual number of atoms or molecules taking part in rate determining step is Rate of reaction Velocity of reaction Order of reaction Molecularly
12 Group l-A elements react with water fastly than the reaction of group ll-A elements because l<sub>A</sub>elements are more soft then ll<sub>A</sub> l<sub>A</sub>elements are non-metals l<sub>A</sub>elements have 1 electron in their outermost s-orbital and are strongly electropositive l<sub>A</sub>elements make ionic bond
13 In an experiment the concentration of a reactant 'A' is doubled the rate increases four times. If concentration in tripled, then rate increases nint times. Thus the rate is proportional to ______ of concentration of 'A' Square root Square Twice Cube
14 Decreases om concentration of reactant is denoted by dc/dt -dc/dt +dc/dt None
15 In thermal decomposition of N2O the half life period for two different initial concentrations of N2O are
(i) 255 second for initial N2O 290 mm Hg
(ii) 212 second for initial N2O 360 mm Hg then it is
 Zero order First order Second order Third order
16 Half life period of a reaction is inversely proportion to the initial concentration of the reactant, then order of reaction is Third order Second order Fist order Zero order
17 Half life period of N2O5is 24 minutes and it remains same where we increase or decrease its initial concentration, then reactions Zero order First order Second order Third order
18 1st order 2nd order Zero order 3rd order
19 Three times Six times Nine times Two times
20 When we perform the same reaction by taking two different initial concentrations of a reactant for a second order reaction then Reaction becomes exothermic Energy of activation is different Mechanism of reaction is changed Half life period is changed
21 Initial concentration of reaction Initial concentration of products Final concentration of products Order of the reaction
22 In exothermic reaction decrease in potential energy of the products will result in Decreases in kinetic energy of the particles Increases in kinetic energy of the particles No change in kinetic energy Decreases in activation energy
23 In the hydrolysis of CH3COOC2H5the acid produced is Inhibitor Catalyst Auto catalyst None of above
24 By the use of catalysis the energy of activation is Decreased Increased Not affected None
25 For effective collisions the molecules slow down before collision and their kinetic energy decreases which results in increase in their Activation energy Average energy Potential energy Collisions frequency
26 For a chemical reaction to take place the particles must have sufficient energy for the effective collisions, the energy is called Average energy Activation energy Potential energy Collision energy
27 Measuring pH Measuring density Titration against standard NaOH Titration against standard KMnO<sub>4</sub>solution
28 Optical rotation method is sued when Reaction involve ions Change of refractive indices Reactions involving change of optical activity None of the above
29 Dilatometric method is used for rate determination when Reactions involving change of optical Reactions involving change of optical activity Reactions involving small volume change None of above
30 Refrectrometric method is used when Reactions involving absorption of I.R. or U. V Reactions involving change of refractive index Reactions involving ions Change of optical activity
Download This Set

Is this page helpful?