ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 0.02 0.2 50 25
2 The state of equilibrium refers to State of rest Dynamic state Stationary state State of inertness
3 Two moles of HI was heated in a sealed tube at 440°C till the equilibrium was reached. HI was found to be 22% decomposed. The equilibrium constant for dissociation is 0.282 0.0796 0.0199 1.99
4 The avtive mass of 64 g of HI in a two litre flask would be 2 1 5 0.25
5 Which of the following factors will favour the reverse reaction in a chemical equilibrium? Increase in concentration of one of the reactants Increase in concentration of one of the products Removal of one of the products regularly None of these
6 Favour the formation of N<sub>2</sub>O<sub>4</sub> Favour the decomposition of N<sub>2</sub>O<sub>4</sub> Not alter the equilibrium Stop the reaction
7 According to Le-Chatelier's principal, adding heat to a solid and liquid in equilibrium will cause the Amount of solid to decrease Amount of liquid to decrease Temperature to rise Temperature to fall
8 Equal volumes of N<sub>2</sub>and H<sub>2</sub>are reacting Equal masses of N<sub>2</sub>and H<sub>2</sub>are reacting The reaction has stopped The same amount of ammonia is formed as is decomposed into N<sub>2</sub>and H<sub>2</sub>
9 [A] = [B] [A] &lt; [B] [B] = [C] [A] &gt; [B]
10 Complete conversion of A to B has taken place Conversion of A to B is only 50% complete Only 10% conversion of A to B has taken place The rate of transformation of A to B is just equal to rate of transformation of B to A in the system
11 The equilibrium constant in a reversible chemical reaction at a given temperature Depends on the initial concentration of the reactants Depends on the concentration of one of the products at equilibrium Does not depend on the initial concentration of rectants It is characteristic of the reaction
12 In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled then the equilibrium constant will Also be doubled Be halved Becomes one fourth Remains the same
13 0.60 1.67 0.66 2.6
14 Forward reaction is favoured Backward reaction is favoured No effect None of the above
15 The bond order in No is 2.5 while that in NO+is 3.Which of the following statements is true for these two species? Bond length in NO<sup>+</sup>is greater than in NO Bond length in unpredictable Bond length in NO<sup>+</sup>is equal to that in NO Bond length in NO is greater than in NO<sup>+</sup>
16 Which carbon is more electronegative? sp<sup>3</sup>- hybridized carbon sp-hybridized carbon sp<sup>2</sup>-hybridized carbon always same irrespective of its hybrid state
17 Maximum hydrogen bonds in water are 4 3 2 8
18 In OF2, number of bond pairs and Ione paris of electrons are respectively 2,6 2,8 2,10 2,9
19 Which of the following has zero depole-moment? CIF PCl<sub>3</sub> SiF<sub>4</sub> CFCl<sub>4</sub>
20 Number of sigma bonds in P4O10is 6 7 17 16
21 The electronegativeities of F,Cl,Br and I are 4.0,3.0,2.8,2.5 respectively.Hydrogen halide with a high percentage of ionic character is HF HCL HBr HI
22 Shape of CIO3is Triangular pyramidal Tetrahedral Triangular planar Triangular bipyramidal
23 Fluorine molecule is formed by The axial p-p overlap The sidewise p-p overlap The axial s-p overlap The overlap of two sp<sup>2</sup>hybrid orbitals
24 The boiling point of heavy water is 108<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 101.4<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 99<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 110<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
25 Antibonding MO is formed by Addition of atomic orbitals Substraction of atomic orbitals Multiplication of atomic orbitals None of these
26 The number of antibonding electron pairs in O2-molecular ion on the basis of MOT is 4 3 2 5
27 The bond order of individual C - C bond is benzene is One Two Between one and two One and two alternately
28 The shape of gaseous SnCl2is Tetrahedral Linear Angular T-shaped
29 The shape of the molecule SF2Cl2is Trigonal bipyradmidal Cubic Octahedral Tetrahedral
30 The most suitable method of the separation of a mixture of ortho and para-nitrophenol mixed in the ratio of 1: 1 is Distrillation Crystallization Vapourisation Colour spectrum
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