ECAT Chemistry MCQ's Test For Full Book With Answers

ECAT Chemistry MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 In the particular reaction for the valueKc 1 x10-25which statement is correct : Almost forward reaction is completed. Amount of reactant is negligible as compared to product. Amount of product is negligible as compared to reactant. Amount of product is equal to amount of reactant.
2 For what value ofKc almost forward reaction is complete : <p class="MsoNormal">K<sub>c = </sub>10<sup>30</sup><o:p></o:p></p> <p class="MsoNormal"><o:p></o:p></p> <p class="MsoNormal">K<sub>c = </sub>10<sup>-30</sup><o:p></o:p></p> <p class="MsoNormal"><o:p></o:p></p> <p class="MsoNormal">K<sub>c = </sub>0<o:p></o:p></p> <p class="MsoNormal">K<sub>c = </sub>1<o:p></o:p></p>
3

N2 + 3H2 ⇌2NH3

The unit of Kc for tis reaction will be:

 <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">mol<sup>2</sup> dm<sup>-6</sup></span><o:p></o:p></p> <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">mol<sup>-2</sup> dm<sup>+6</sup></span><o:p></o:p></p> <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">mol dm<sup>-3</sup></span><o:p></o:p></p> <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">mol<sup>-1</sup> dm<sup>+3</sup></span><o:p></o:p></p>
4

N2 + O2 ⇌2NO

The unit of Kc for tis reaction will be:

 <p class="MsoNormal"><o:p></o:p></p> <p class="MsoNormal">No unit<o:p></o:p></p> <p class="MsoNormal"><o:p></o:p></p> <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">mol<sup>-2</sup> dm<sup>-3</sup></span><o:p></o:p></p> <p class="MsoNormal"><o:p></o:p></p> <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">mol<sup>-1</sup> dm<sup>-3</sup></span><o:p></o:p></p> <p class="MsoNormal"><o:p></o:p></p> <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">mol<sup>-2</sup> dm<sup>+3</sup></span><o:p></o:p></p>
5

1 mol of N2O4 was decomposed according to given equation in 1dm3 container. At equilibrium x mole of N2O4 have dissociated. What is the value of KC:

 <p class="MsoNormal">2x/(1-x)<sup>2<o:p></o:p></sup></p> <p class="MsoNormal">4x<sup>2</sup>/(1-x)<o:p></o:p></p> <p class="MsoNormal">4x/(1-x)<o:p></o:p></p> <p class="MsoNormal">2x/(1-x)<o:p></o:p></p>
6 The correct relation b/wKc andKp is : <p class="MsoNormal">K<sub>p</sub> = K<sub>c</sub>[P/N] <sup>Δn<o:p></o:p></sup></p> <p class="MsoNormal">K<sub>c = </sub>K<sub>p</sub>(RT) <sup>Δn</sup><o:p></o:p></p> <p class="MsoNormal">K<sub>p = </sub>K<sub>c</sub>(RT) <sup>Δn</sup><o:p></o:p></p> <p class="MsoNormal">K<sub>p = </sub>K<sub>c</sub>(RT) <sup>Δn</sup><o:p></o:p></p>
7 For the above reaction the relationship b/w kc and kp will be : <p class="MsoNormal">K<sub>p</sub> = K<sub>c</sub>RT<o:p></o:p></p> <p class="MsoNormal">Kp = K<sub>c</sub>(RT)<sub>-1</sub><o:p></o:p></p> <p class="MsoNormal">K<sub>p</sub> = K<sub>c</sub>(RT)<sub>-2</sub><o:p></o:p></p> <p class="MsoNormal">K<sub>c</sub> = K<sub>p</sub><o:p></o:p></p>
8 H2 + L2 ----2Hl
In the above equilibrium system, if the concentration of reactants at 25°C is increased, the value KC will :
 Remains Constant Increases Cecreases Depends upon nature of reactans
9 I a chemical reaction equilibrium is said to have been established when : Rate of opposing reactions are equal. Rate constants of opposing reactions are equal. Opposing reactions stop. Concentration of reactants and products are equal
10 Law of mass action was given by : Guldberg and Waage. Berkeley and Hartly. Ramsay and Reyleigh. Berthelot.
11 The rate of reaction : Remain same as reaction proceeds. May decrease or increase as reaction proceeds . Increase as reaction proceeds. Decreases as reaction proceeds.
12 A chemical reaction A---------->B is said to be in equilibrium when : Rate of transformation of A to B is equal to B to A. 50% reactant has been changed to B. Conversion of A to B is 50% complete Complete conversion of A to B has taken place.
13 The rate of a chemical reaction is directly;y proportional to product of molar concentration of reaction substance it is called : Low of conservation of energy. Law of mass action. Rate law . Active mass rule.
14 What happens when reaction is at equilibrium and more reactant is added : Forward reaction rate is increased. Forward reaction rate is decreased. Backward reaction rate is increased. Equilibrium remains unchanged.
15 A reaction is reversible because : Products are stable. Reactants are reactive. Products are reactive. Reactants re stable.
16

An excess of aqueous silver nitrate is added to aqueous barium chloride and precipitate is removed by filtration. What are the main ion in filtrate?

 <p class="MsoNormal">Ag<sup>+</sup> and NO<sub>3-</sub> only<o:p></o:p></p> <p class="MsoNormal">Ag<sup>+</sup> and Ba<sup>2</sup> and NO<sup>-3</sup><o:p></o:p></p> <p class="MsoNormal">Ba<sup>2</sup> and NO<sup>-3</sup><o:p></o:p></p> <p class="MsoNormal">Ba<sup>2</sup> and NO<sup>-3 </sup>and Cl-<o:p></o:p></p>
17

The solubility product of AgCl is 2.0 x 10-3 mol2 dm-6 , The maximum concentration of Ag ion in the solution is :

 <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"><o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">2.0 x 10<sup>-10</sup> mol dm<sup>-3</sup></span><o:p></o:p></p> <p class="MsoNormal">1.41 <span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">x 10<sup>-10</sup> mol dm<sup>-3<o:p></o:p></sup></span></p> <p class="MsoNormal">1.0<sup><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"> </span></sup><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">x 10<sup>-10</sup> mol dm<sup>-3<o:p></o:p></sup></span></p> <p class="MsoNormal">4.0<sup><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"> </span></sup><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">x 10<sup>-10</sup> mol dm<sup>-3</sup></span><o:p></o:p></p>
18

The ph of 10-3 mole dm-3 of an aqueous solution of H2SO4 is :

 <p class="MsoNormal">3.0<o:p></o:p></p> <p class="MsoNormal">2.7<o:p></o:p></p> <span style="font-size:11.0pt;line-height:107%; font-family:&quot;Calibri&quot;,sans-serif;mso-ascii-theme-font:minor-latin;mso-fareast-font-family: Calibri;mso-fareast-theme-font:minor-latin;mso-hansi-theme-font:minor-latin; mso-bidi-font-family:Arial;mso-bidi-theme-font:minor-bidi;mso-ansi-language: EN-US;mso-fareast-language:EN-US;mso-bidi-language:AR-SA">2.0</span> <p class="MsoNormal">1.5<o:p></o:p></p>
19 Which statement about the following equilibrium in correct?

2SO2 (g)+ O2(g)---------------2sO3(g)H= - 188.3 KJ mol-1

 T value of K<sub>p falls witha rise in temperate.</sub> The value of K<sub>p falls withincreasing pressure</sub><p class="MsoNormal"><o:p></o:p></p> Adding V<sub>2O</sub><sub>5</sub>catalyst increase the equilibrium yield of sulfur trioxide<p class="MsoNormal"><o:p></o:p></p> The value of K<sub>p is equal to</sub>K<sub>p</sub> <br><p class="MsoNormal"><o:p></o:p></p><p class="MsoNormal"><o:p></o:p></p>
20 For which system does the equilibrium constant, kc has units of (concentration) ? <p class="MsoNormal">N<sub>2</sub>+3H<sub>2--</sub>-----2NH<sub>3</sub><o:p></o:p></p> <p class="MsoNormal">H<sub>2</sub>+L<sub>2</sub>---------2HL<o:p></o:p></p> <p class="MsoNormal">2NO<sub>2</sub>----------N<sub>2</sub>O<sub>4</sub><o:p></o:p></p> <p class="MsoNormal">2HF--------H2+F<sub>2</sub><o:p></o:p></p>
21 Some Non-spontaneous process can be made to take place by supplying energy to the system from : Internal source. Any source. External source. All of above.
22 Burning of coal and hydrocarbon in air are examples of : Non-spontaneous reaction. Spontaneous reaction. Natural reaction Both (a) and (C)
23 A reaction will also be called a spontaneous if : It does no need energy to start with. It needs energy to carry the whole process. It needs energy at the end of reaction. It needs energy to stat with.
24 The reaction of zinc with the copper sulfate solution is an example of. Oxidation reduction reaction. Spontaneous reaction. Spontaneous redox reaction. Non-spontaneous reaction.
25 When a piece of zinc is added to the copper sulfate solution,____________ color of solution disappear. Pink. Purple. Blue. Brown.
26 Neutralization of a strong acid with a strong abase is: Natural acid base reaction. Artificial acid base reaction. Spontaneous acid base reaction. Both (a) and (c).
27 Which one of the following is not related to spontaneous process. <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">Unidirectional.</span><sup><o:p></o:p></sup></p> Real. <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">Irreversible.</span><o:p></o:p></p> Artificial.
28 A process which takes place on its own without any outside assistance and moves from a non-equilibrium stat towards an equilibrium stat is termed as: Spontaneous process. Natural process. Non-Spontaneous process. Both (a) and (b).
29 The subject matter of first law of thermochemistry is based on: First law of Themochemistry. First law of Thermodynamics. Second law of Themochemistry. Second law of Thermodynamics.
30 The energy units in which heat changes usually expressed in Sl-system are: Joule. Calorie. Kilo Joule. Both (a) and (c)
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