Chemical Equilibrium test 1

Student’s Name:____________Admission No.______Roll No._____Section:______
Paper: Chemistry     Class: 10                     Time Allowed:    One Hour                           Marks: 25 

Checked by:_______________ Rechecked by:_____________ Sign Invigilator:_____________

Q1. Circle the correct answer.  (10)

1.A dynamic equilibrium?
a) the reaction stops to proceed
b) the amount of reactants and products are equal
c) the speed of forward and reverse reactions are equal
d) all of these
2.Plants consume?
a) carbon dioxide           b) oxygen              c) nitrogen            d) hydrogen
3. has units in reactions with?
a) equal number of moles on both sides of the balance equation
b) different number of moles on both sides of the balance equation
c) equal number of moles of reacting substances
d) different number of moles of products
4.Active mass is expressed by?
a) small bracket           b) square bracket           c) bar            d) none of these
5.When the magnitude of is very large it indicates?
a) reaction mixture consists of almost all products
b) raection mixture has almost all reactions
c) reaction has not gone to completion
d) reaction mixture has negligible products
6.Which statement is not correct about active mass?
a) rate of reaction is directly proportional to active mass
b) active mass is taken in molar concentration
c) active mass is represented by square brackets
d) active mass means total mass of substances
7.The lives of aquatic plants and animals are indirectly related to concentration of dissolved __________ in water?
a) carbon dioxide                 b) oxygen               c) nitrogen              d) hydrogen
8.Plants release?
a) carbon dioxide           b) oxygen           c) nitrogen           d) hydrogen
9.In chemical reaction, the substance that combine are called?
a) Reactants                b) Products                c) Equilibrium           d) Numerator
10.At equilibrium state, the amount of reactants and products?
a) increase              b) decrease                   c) do not change               d) double

Q 2. Write short answers to these questions:    (15)
1.Derive the equilibrium constant expression for the synthesis of ammonia from nitrogen and hydrogen?
2.Derive equilibrium constant expression for ionization of hydrochloric acid?
3.What is the importance of equilibrium constant?
4.Give Kc of following reaction?
5.What is chemical reaction? Explain the terms reactants and products?

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