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Equilibrium - Practice Test (1) - Class 9 MCQ


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25 Questions MCQ Test - Equilibrium - Practice Test (1)

Equilibrium - Practice Test (1) for Class 9 2024 is part of Class 9 preparation. The Equilibrium - Practice Test (1) questions and answers have been prepared according to the Class 9 exam syllabus.The Equilibrium - Practice Test (1) MCQs are made for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Equilibrium - Practice Test (1) below.
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Equilibrium - Practice Test (1) - Question 1

When the rate of evaporation is equal to the rate of condensation, it is called

Detailed Solution for Equilibrium - Practice Test (1) - Question 1

when the rate of forward reaction becomes equal to rate of backward reaction equilibrium is established.

Equilibrium - Practice Test (1) - Question 2

the concentrations in an equilibrium mixture are related by the following equilibrium equation,  Where Kc is called as

Detailed Solution for Equilibrium - Practice Test (1) - Question 2

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Equilibrium - Practice Test (1) - Question 3

Which of the following is not a general characteristic of equilibria involving physical processes?

Detailed Solution for Equilibrium - Practice Test (1) - Question 3

All the physical processes stop at equilibrium.

Equilibrium - Practice Test (1) - Question 4

At 500 K, equilibrium constant, Kc, for the following reaction is  What would be the equilibrium constant Kc for the reaction 2HI (g) ⇌⇌ H2(g)  +I2(g)

Detailed Solution for Equilibrium - Practice Test (1) - Question 4

The second equation can be obtained by reversing the 1st reaction and multiplying by 2. So  Here , 

Equilibrium - Practice Test (1) - Question 5

0.023 g of sodium metal is reacted with 100 cm3 of water. The pH of the resulting solution is ______.

Detailed Solution for Equilibrium - Practice Test (1) - Question 5

Moles of NaOH formed = 0.023/23 =0.001 Conc of NaOH=0.001x1000/100 =0.01 pOH=-log[OH-] =2 pH=14-2=12

Equilibrium - Practice Test (1) - Question 6

In the dynamic equilibrium stage, one of the following events take place. Choose the right one.

Detailed Solution for Equilibrium - Practice Test (1) - Question 6

there is no change in the conc of reactant and product.

Equilibrium - Practice Test (1) - Question 7

Equilibrium constant for the reaction, 4NH3(g) + 5O2(g)!4NO(g) + 6H2O (g) is written as

 

Detailed Solution for Equilibrium - Practice Test (1) - Question 7

Equilibrium - Practice Test (1) - Question 8

Which of the following statements is incorrect?

Detailed Solution for Equilibrium - Practice Test (1) - Question 8

ice water is in equilibrium therefore mass of ice and water does not change with time.

Equilibrium - Practice Test (1) - Question 9

For the reaction N2O4(g) ⇌⇌2NO2(g), the value of K is 50 at 400 K and 1700 at 500 K. Which of the following option is incorrect?

Detailed Solution for Equilibrium - Practice Test (1) - Question 9

As the Temperature is increasing K constant value is increasing that means reaction is moving in forward direction. So reaction is endothermic because endothermic reactions are favoured at high temperature.

Equilibrium - Practice Test (1) - Question 10

H2S is passed into one dm3 of a solution containing 0.1 mole of Zn2+ and 0.01 mole of Cu2+ till the sulphide ion concentration reaches 8.1 × 10−−19 moles. Which one of the following statements is true? [Kspof ZnS and CuS are 3 × 10−−22and 8 × 10−−36respectively]

Detailed Solution for Equilibrium - Practice Test (1) - Question 10

for both CuS and ZnS Kip will exceed Ksp so both will precipitate.

Equilibrium - Practice Test (1) - Question 11

the rates of transfer of molecules from ice into water and of reverse transfer from water into ice are equal at atmospheric pressure and 273 K. Both the processes occur simultaneously and at the same rate so that the amount of ice and water remains constant. This process is called

Detailed Solution for Equilibrium - Practice Test (1) - Question 11

Rate of evaporation= rate of condensation. This is condition of dynamic equillirium.

Equilibrium - Practice Test (1) - Question 12

For reactions involving gases, however, it is usually more convenient to express the equilibrium constant in terms of

Detailed Solution for Equilibrium - Practice Test (1) - Question 12

Equilibrium - Practice Test (1) - Question 13

Which of the following statements is incorrect?

Detailed Solution for Equilibrium - Practice Test (1) - Question 13

ice water is in equilibrium therefore mass of ice and water does not change with time.

Equilibrium - Practice Test (1) - Question 14

At a particular temperature and atmospheric pressure, the solid and liquid phases of a pure substance can exist in equilibrium. Which of the following term defines this temperature?

Detailed Solution for Equilibrium - Practice Test (1) - Question 14

Normal melting both the phases liquid and solid exist in equilibrium.

Equilibrium - Practice Test (1) - Question 15

pH value of which one of the following is NOT equal to one?


 

Detailed Solution for Equilibrium - Practice Test (1) - Question 15

CH3COOH is weak acid so its pH cannot be close to 1 if we have 0.1M

Equilibrium - Practice Test (1) - Question 16

H2O(l) ⇌ H2(vap). This equation best illustrates the

Detailed Solution for Equilibrium - Practice Test (1) - Question 16

This is liquid , vapour equilibrium.

Equilibrium - Practice Test (1) - Question 17

If the Kc is neither too small nor too large, one of the following will happen

Detailed Solution for Equilibrium - Practice Test (1) - Question 17

Rxn is at equilibrium.

Equilibrium - Practice Test (1) - Question 18

When hydrochloric acid is added to cobalt nitrate solution at room temperature, the following reaction takes place and the reaction mixture becomes blue. On cooling the mixture it becomes pink. On the basis of this information mark the correct answer. 

Detailed Solution for Equilibrium - Practice Test (1) - Question 18

This reaction is endothermic.

Equilibrium - Practice Test (1) - Question 19

The ionisation of hydrochloric in water is given below: 

 

Detailed Solution for Equilibrium - Practice Test (1) - Question 19

HCl is acid and its conjugate base will be Cl

Equilibrium - Practice Test (1) - Question 20

A vessel at 1000 K contains CO2 with a pressure of 0.5 atm. Some of the CO2 is converted into CO on the addition of graphite. If the total pressure at equilibrium is 0.8 atm, the value of K is

Detailed Solution for Equilibrium - Practice Test (1) - Question 20

Equilibrium - Practice Test (1) - Question 21

During the process of transformation from liquid to vapour, the pressure exerted by the water molecules at a given temperature remains constant. This is called

Detailed Solution for Equilibrium - Practice Test (1) - Question 21

This is known as vapour pressure.

Equilibrium - Practice Test (1) - Question 22

Find KcKc for the following reaction, if CO2CO2pressure is in atmospheres:

Detailed Solution for Equilibrium - Practice Test (1) - Question 22

Equilibrium - Practice Test (1) - Question 23

The pH of neutral water at 25C is 7.0. As the temperature increases, ionisation of water increases, however, the concentration of H+ ions and OH ions are equal. What will be the pH of pure water at 60C?

Detailed Solution for Equilibrium - Practice Test (1) - Question 23

pH of water will be around 7 only. Water will be neutral even at 60°C

Equilibrium - Practice Test (1) - Question 24

The aqueous solution of sugar does not conduct electricity. However, when sodium chloride is added to water, it conducts electricity. How will you explain this statement on the basis of ionisation and how is it affected by concentration of sodium chloride?

Detailed Solution for Equilibrium - Practice Test (1) - Question 24

NaCl ionises completely in water and increase in concentration of salt increases conductance.

Equilibrium - Practice Test (1) - Question 25

What is the best description of the change that occurs when Na2O(s) is dissolved in water?

Detailed Solution for Equilibrium - Practice Test (1) - Question 25

Oxide ion donates a pair of electrons

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