Chemical Equilibrium Test 6

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

Q2. Write short answers to these questions:     (15 ) 
1.What is the importance of equilibrium constant?
2.What is chemical reaction? Explain the terms reactants and products?
3.Derive equilibrium constant expression for ionization of hydrochloric acid?
4.Give Kc of following reaction?
5.Derive the equilibrium constant expression for the synthesis of ammonia from nitrogen and hydrogen?



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