Chemistry Class 11 QBank
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1 – Some Basic Concepts in Chemistry1 Test
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2 – Structure of Atoms1 Test
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3 – Classification of Elements & Periodicity in Properties1 Test
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4 – Chemical Bonding and Molecular Structure1 Test
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5 – States of Matter Gaseous and Liquids1 Test
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6 – Thermodynamics1 Test
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7 – Chemical Equilibrium1 Topic|1 Test
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8 – Ionic Equilibrium1 Test
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9 – Redox Reactions1 Test
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10 – Hydrogen1 Test
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11 – s Block Elements (Alkali & Alkaline Earth Metals)
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12 – Some p Block Elements
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13 – Organic Chemistry Some Basic Principles and Techniques
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14 – Hydrocarbons
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15 – Environmental Chemistry
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Question 1 of 45
1. Question
15 moles of H2 and 5.2 moles of l2 are mixed and allowed to attain equilibrium at 500°c The concentration of HI is found to be 10 moles at equilibrium. Find the equilibrium constant for the formation of HI.
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Question 2 of 45
2. Question
Statement 1: Unit of \(K_{c} =L^{2} mol^{-2}\) for the reaction \(N_{2}(g)+3H_{2}(g) \leftrightharpoons 2NH_{3}(g)\).
Statement 2: Equilibrium constant \(K_{c} = \frac{[NH_{3}^{2}]}{[N_{2}][H_{2}]^{3}}\) for the reaction \(N_{2}(g) + 3H_{2}(g) \leftrightharpoons 2NH_{3}(g).\)
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Question 3 of 45
3. Question
The value of Kp will be equal to Kc in which of the following equation?
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Question 4 of 45
4. Question
Find the equilibrium constant for the following gaseous reaction \(H_{2}+I_{2} \leftrightharpoons 2HI.\)
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Question 5 of 45
5. Question
2 moles of PCl5 were heated in a closed vessel of 2 litre capacity. At equilibrium, 40% of PCl5 is dissociated into PCl3 and Cl2. What is the value of equilibrium constant?
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Question 6 of 45
6. Question
Statement 1 : Colour of the mixture turns to pink from deep blue for a reaction, \(Co(H_{2}O)_{6(aq)}^{2+}+4Cl_{(aq)}^{-} \leftrightharpoons CoCl_{4(aq)}^{2-}+6H_{2}O_{(l)}\)after cooling a freezing mixture.
Statement 2 : Reaction is endothermic so on cooling, the reaction moves to backward direction.
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Question 7 of 45
7. Question
What is the correct explanation of the effect of catalyst on the velocity in a reversible reaction?
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Question 8 of 45
8. Question
What does the K becomes if concentration of reactants is increased by ‘x’?
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Question 9 of 45
9. Question
Equilibrium is attained by the reaction when the free energy change accompanying it is
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Question 10 of 45
10. Question
HI was heated in a closed tube at 440°c till equilibrium is obtained. At this temperature 22% of HI was dissociated. What will be the equilibrium constant for this dissociation?
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Question 11 of 45
11. Question
Reactant ‘A’ decomposes 10% in 1 hour, 20% in 2 hour and 30% in 3 hour in a reaction. What is the unit of rate constant of this reaction?
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Question 12 of 45
12. Question
For which of the following reactions Kp is greater than Kc?
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Question 13 of 45
13. Question
Kp is less than Kc in which of the following equilibria?
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Question 14 of 45
14. Question
\( \Delta \) G°(HI,g) = + 1.7 kJ. The equilibrium constant at 25°C for 2Hl(g)\( \leftrightharpoons \) H2(g) + l2(g) isCorrectIncorrect -
Question 15 of 45
15. Question
56 g of nitrogen and 8 g hydrogen gas are heated in a closed vessel. At equilibrium 34 g of ammonia are present. What are the equilibrium no. of moles of nitrogen, hydrogen and ammonia respectively?
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Question 16 of 45
16. Question
In which of the following reaction, yield of product will increase with increase in pressure?
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Question 17 of 45
17. Question
If for \(H_{2(g)} + \frac{1}{2}S_{2(s)} \leftrightharpoons H_{2}S_{(g)} and H_{2(g)} + Br_{2(g)} \leftrightharpoons 2HBr_{(g)}.\)The reaction\(Br_{2(g)} + H_{2}S_{(g)} \leftrightharpoons 2HBr_{(g)}+ \frac{1}{2}S_{2(s)}\) would have equilibrium constant ________ where \(K_{1} and K_{2}\) are the equilibrium constants respectively.
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Question 18 of 45
18. Question
For reaction \(PCl_{5}(g) \leftrightharpoons PCl_{3}(g) + Cl_{2}(g),\)
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Question 19 of 45
19. Question
5 moles of SO2 and 5 moles of O2 are allowed to react to form SO3 in a closed vessel. At the equilibrium stage 60% of SO2 is used up. Find the total number of moles of SO2, O2 and SO3 in the vessel now.
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Question 20 of 45
20. Question
Statement 1: Catalyst affects the final state of the Equlibrium.
Statement 2: It enables the system to attain a new equilibrium state by complexing with the reagents.
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Question 21 of 45
21. Question
The formation of HX will be favoured by _____ in the gaseous equilibrium \(H_{2} X_{2}+heat \leftrightharpoons 2HX\)CorrectIncorrect -
Question 22 of 45
22. Question
In Haber process 30 litres of dihydrogen and 30 litres of dinitrogen were taken for reaction which yielded only 50% of the expected product. The composition of gaseous mixture under the aforesaid condition in the end will be:
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Question 23 of 45
23. Question
The information that can be obtained on the basis of Le-chatelier’s principle is:
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Question 24 of 45
24. Question
Increasing the temperature of an equilibrium system
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Question 25 of 45
25. Question
Value of Kc will be equal to which of the following for reaction, \(2A(g) \leftrightharpoons 3C(g) + D(s)\)?CorrectIncorrect -
Question 26 of 45
26. Question
One mole of \(SO_{3}\) was placed in a litre reaction vessel at a certain temperature. The following equilibrium was established \(2SO_{3} \leftrightharpoons 2SO_{2}+O_{2}\). At equilibrium 0.6 moles of \(SO_{2}\) were formed. What will be the equilibrium constant of the reaction?
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Question 27 of 45
27. Question
What is the equilibrium constant K for the system \( 2A(g) + B(g) \leftrightharpoons 3C(g)?\)
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Question 28 of 45
28. Question
Statement 1: Addition of a small amount of sodium acetate to a dilute solution of acetic acid does not affect the pH value.
Statement 2: Buffer solutions have a definite pH value.
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Question 29 of 45
29. Question
Statement 1: The pH of 10 M HCI aqueous solution is less than 1.
Statement 2: The pH is -ve logarithm of H+ concentration.
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Question 30 of 45
30. Question
Statement 1 : For the reverse reaction, equilibrium constant is the inverse of the equilibrium constant for the reaction in the forward direction.
Statement 2 : Equilibrium constant depends upon the way in which the reaction is written.
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Question 31 of 45
31. Question
The equilibrium constant changes with _____ for the reaction\(H_2(g)+ l_2(g) \leftrightharpoons 2HI(g) \)
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Question 32 of 45
32. Question
For the reaction \(C(s) + CO_{2}(g) \leftrightharpoons 2CO(g)\), the partial pressure of \(CO_{2}\) and CO are 2.0 and 4.0 atm respectively at equilibrium. What is the \(K_{p}\) for the reaction?
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Question 33 of 45
33. Question
Under conditions of constant _________ \(\Delta G = 0\) for a system in equilibrium.
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Question 34 of 45
34. Question
Statement 1 : Effect of temperature of Kc or Kp depends on enthalpy
Statement 2 : Increase in temperature shifts the equilibrium in exothermic direction while decrease in the temperature shifts the equilibrium position in endothermic direction.
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Question 35 of 45
35. Question
The equilibrium reactions in which the equilibrium would shift to the right if total pressure is increased is:
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Question 36 of 45
36. Question
The standard state Gibbs free energy change for the given isomerization reaction \(cis-2-pentene \leftrightharpoons trans -2 -pentene\) is -3.67 kJ/mol at 400 K. What happens if more trans-2-pentene is added to the reaction vessel?
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Question 37 of 45
37. Question
Following gaseous reaction is undergoing in a vessel \(C_{2}H_{4}+H_{2} \leftrightharpoons C_{2}H_{6}: \Delta H=-32.7 Kcal\), Which of the following will increase the equilibrium concentration of \(C_{2}H_{6}\)?
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Question 38 of 45
38. Question
in the chemical reaction \(N_{2}+3H_{2} \rightarrow 2NH_{3}\) the product increases by ________ .
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Question 39 of 45
39. Question
Consider the reaction \(A_{2(g)} + B_{2(g)} \leftrightharpoons 2AB_{(g)} ; \Delta H= + ve\)
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Question 40 of 45
40. Question
Gaseous reaction \(A + B \leftrightharpoons 2C + D ; + Q\) is most favoured at which of the following?
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Question 41 of 45
41. Question
Sodium sulphate dissolves in water with evolution of heat. Consider a saturated solution of sodium sulphate. According to Le-Chatelier principle, if the temperature is raised, then
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Question 42 of 45
42. Question
If the equilibrium concentration of A is doubled in the equilibrium \(AB \leftrightharpoons A + B\). the equilibrium concentration of B would become:
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Question 43 of 45
43. Question
The equilibrium constant of the reaction \(H_{2}(g)+I_{2}(g) \leftrightharpoons 2HI\) is 64. What will be the value of the equilibrium constant if volume of the container is reduced to one fourth of its original volume?
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Question 44 of 45
44. Question
All reactions that possess chemical disintegration is_____ .
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Question 45 of 45
45. Question
The following equation gives the exothermic formation of \(ClF_{3}\).
\(Cl_{2(g)}+3F_{2(g)} \leftrightharpoons 2ClF_{3(g)} ; \Delta H= – 329 kj\)
Which of the following will increase the quantity of \(ClF_{3}\) in an equilibrium mixture of \(Cl_{2}, F_{2}\) and \(ClF_{3}?\)
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