ECAT Chemistry MCQ's Test For Full Book With Answers

ECAT Chemistry MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 High temperature Low temperature Low pressure High pressure
2 High temperature and low pressure Low temperature and low pressure Low temperature and high pressure High temperature and high pressure
3 Under what condition of temperature and pressure the formation of atomic hydrogen from molecular hydrogen will be favourd High temperature and high pressure Low temperature and low pressure High temperature and low pressure :Low temperature and high pressure
4 A chemical reaction is in equilibrium when Formation of product is minimum Reactants are completely transformed into products Rates of forward and backward reactions are equal Equal amounts of reactants and products are present
5 The rate of forward reaction is two times that of the reverse reaction at a given temperature and identical concentration, K equilibrium is 0.5 1.5 2.5 2.0
6 1 mole of N2and 2 moles of H2are allowed to react in a 1 dm3vessel. At equilibrium 0.8 mole of NH3is formed. The concentration of H2in the vessel is 0.6 mole 0.8 mole 0.2 mole 0.4 mole
7 Which of the following favours the reverse reaction in chemical equilibrium? Increasing the concentration of the reactant Removal of the least one of the products at regular intervals Increasing the concentration of one or more of the products None of these
8 When H2and I2are mixed and equilibrium is attained, then Amount of HI formed is equal to the amount of H<sub>2</sub>dissociated HI dissociation stops The reaction stops completely None of these
9 A gas bulb is filled with NO2gas and immersed in an ice bath at 0°C which becomes colourless after sometimes. This colourless gas will be NO<sub>2</sub> N<sub>2</sub>O N<sub>2</sub>O<sub>4</sub> N<sub>2</sub>O<sub>5</sub>
10 K<sub>p</sub>&gt; K<sub>c</sub> K<sub>c</sub>&gt; K<sub>p</sub> K<sub>p</sub>= K<sub>c</sub> None of these
11 Pressure change Temperature change Concentration change Catalyst
12 0.12 0.50 0.25 4.00
13 Increases Decreases Remains same Cannot be predicted
14 Low pressure High pressure High temperature High concentration of SO<sub>2</sub>
15 1 10 5 0.33
16 Introduction of an inert gas at constant volume Introduction of PCl<sub>3</sub>(g) at constant Introduction of PCl<sub>5</sub>(g) at constant volume Introduction of Cl<sub>2</sub>at constant volume
17 8 4 9 3
18 The concentration of reactants is increased by x, then equilibrium constant K becomes ln K/x K/x K + x K
19 In a reversible reaction, two substances are in equilibrium. If the concentration of each one is reduced to half, the equilibrium constant will be Reduced to half of its original value Doubled Same Reduced to one fourth its original value
20 0.073 0.147 0.05 0.026
21 32 64 16 4
22 High temperature and low pressure Low temperature and high pressure Low temperature and low pressure High temperature and high pressure
23 1.1 mol of A is mixed with 2.2 mol of B and the mixture is kept in on litre flask till the equilibrium is reached. At equilibrium, 0.2 mol of C is formed. If the equilibrium reaction is A+2B 2C+D, the value of equilibrium constant is 0.002 0.004 0.001 0.003
24 At certain temperature, 50% of HI is dissociated into H2and I2the equilibrium constant is 1.0 3.0 0.5 0.25
25 Total pressure Amount of A<sub>2</sub>and B<sub>2</sub> Temperature Catalyst
26 In an exothermic reaction, a 10° rise in temperature will Decrease the value of equilibrium constant Double the value of K<sub>c</sub> Not produce any change in K<sub>c</sub> Produce some increase in K<sub>c</sub>
27 In which of the following cases, the reaction goes farthest to completion K = 10<sup>3</sup> K = 10<sup>-2</sup> K = 10 K = 10<sup>0</sup>
28 0.02 0.2 50 25
29 The state of equilibrium refers to State of rest Dynamic state Stationary state State of inertness
30 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
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