Chemical Equilibrium Test 5

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.Plants release?
a) carbon dioxide b) oxygen c) nitrogen d) hydrogen
2.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
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.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
5.Plants consume?
a) carbon dioxide b) oxygen c) nitrogen d) hydrogen
6.Active mass is expressed by?
a) small bracket b) square bracket c) bar d) none of these
7.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
8.At equilibrium state, the amount of reactants and products?
a) increase b) decrease c) do not change d) double
9.In chemical reaction, the substance that combine are called?
a) Reactants b) Products c) Equilibrium d) Numerator
10.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

q2.Write short answers to these questions: (15) 
1.Give Kc of following reaction?
2.What is chemical reaction? Explain the terms reactants and products?
3.Derive equilibrium constant expression for ionization of hydrochloric acid?
4.What is the importance of equilibrium constant?
5.Derive the equilibrium constant expression for the synthesis of ammonia from nitrogen and hydrogen?

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