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Chemistry Class 10 Chapter 1


Updated: 10 Dec 2023

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Chemistry Class 10 Chapter 1 introduces the concept of Chemical Equilibrium. This is mainly chapter No. 9, “Chemical Equilibrium”, of the book.
This article consists of Notes, SLO Based Notes and MCQs of chemistry, which cover your course, board papers and clear your chemistry concept for different types of tests.

Chemistry Class 10 Chapter 1 Notes

Chemical equilibrium Notes

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Chemistry Class 10 Chapter No. 9 Notes

Download Chapter 9 Notes

SLO Based Questions

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Chemistry Class 10 Chapter No. 9 SLO Questions

Download Chapter 9 SLO Questions

Chemistry Class 10 Chapter 1 MCQs

1. When Liquid water is placed in a closed container at constant temperature, some of the liquid.
(a) evaporates
(b) Distillates
(c) Condensed
(d) None of these
Show Answer

evaporates
Explanation:


2. The rate of evaporation is more than the rate of condensation in the ______________.
(a) Start
(b) Middle
(c) End
(d) None of these
Show Answer

Start
Explanation:


3. When the ______ of evaporation becomes equal to the rate of condensation, then it is called Chemical equilibrium. (a) Frequencyrong>
(b) Magnitude
(c) rate
(d) None of these
Show Answer

rate
Explanation:


4. Due to equilibrium, the concentration becomes ___________ and does not change with time.
(a) Variable
(b) Constant
(c) None
(d) Both a and b
Show Answer

Constant
Explanation:


5. In equilibrium, both forward and reverse reactions occur__________.
(a) Simultaneously
(b) Separately
(c) Both a & b
(d) None of these
Show Answer

Simultaneously
Explanation:


To Download Complete Notes of Chemistry Notes 10 Class, Click on the given link.

6. Whenever a chemical change occurs, ______________ reactions takes place.
(a) Physical
(b) Chemical
(c) None
(d) Both a and b
Show Answer

Chemical
Explanation:


7. In a chemical reaction, the substances which ________ are called reactants.
(a) Broken down
(b) Synthesized
(c) combined
(d) None of these
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combined
Explanation:


8. In a chemical reaction, the substances which are formed are called ___________.
(a) Products
(b) Reactants
(c) Magnitude
(d) None of these
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Products
Explanation:


9. The reactions in which the products do not recombine to form reactants are called ________ reactions.
(a) Reversible
(b) Irreversible
(c) Halogenation
(d) None of these
Show Answer

Irreversible
Explanation:


10. When irreversible reactions once completed, then they cannot be _______ easily.
(a) Forwarded
(b) Saturated
(c) reversed
(d) None of these
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reversed
Explanation:


11. Those reactions in which the product can react again to form the reactants are called
(a) reversible
(b) Irreversible
(c) Biochemical
(d) None of these
Show Answer

reversible
Explanation:


12. Reversible reactions can never achieve _______________.
(a) Stability
(b) Completion
(c) Lone pair
(d) None of these
Show Answer

Completion
Explanation:


13. Reversible reactions can easily be ________________.
(a) Completed
(b) Forwarded
(c) Reversed
(d) None of these
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Reversed
Explanation:


14. Reversible reactions can be represented by _____arrow between reactants & products.
(a) Single headed
(b) double headed
(c) triple headed
(d) None of these
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double headed
Explanation:


15. Reversible reactions can move in ________directions.
(a) Revers
(b) Forwarded
(c) None
(d) Both a & b
Show Answer

Both a & b
Explanation:


16. 2HgO \quad \rightleftharpoons _____________.
(a) 2Hg + O_2
(b) Hg + O
(c) 3Hg + O_5
(d) None of these
Show Answer

2Hg + O_2
Explanation:


17. A reversible chemical reaction in which the __________ of forward reaction becomes equal to reverse reaction and concentration of products and reactants remain constant is called chemical equilibrium.
(a) Rate
(b) Speed
(c) Both a & b
(d) None of these
Show Answer

Both a & b
Explanation:


18. In a reversible reaction, ________ equilibrium is achieved before completion.
(a) Dynamic
(b) Static
(c) None
(d) Both a and b
Show Answer

Dynamic
Explanation:


19. In reversible reactions, rate of forward __________ rate of reverse reaction.
(a) Directly proportional
(b) Greater than
(c) Equals to
(d) None of these
Show Answer

Equals to
Explanation:


20. The dynamic equilibrium is one in which two chemical processes continue on equal rate but in _______ direction.
(a) Opposite
(b) Same
(c) Inverted
(d) None of these
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Opposite
Explanation:


21. As long as we don’t change the conditions, the system will remain in ___________.
(a) Forward
(b) Reverse
(c) Equilibrium
(d) None of these
Show Answer

Equilibrium
Explanation:


22. At initial stage, the rate of forward reaction is very _________.
(a) Slow
(b) Fast
(c) Negligible
(d) None of these
Show Answer

Fast
Explanation:


23. At initial stage, the rate of reverse reaction is ________.
(a) Negligible
(b) Fast
(c) Slow
(d) None of these
Show Answer

Negligible
Explanation:


24. Forward reaction ______________ gradually.
(a) Speeds up
(b) Slows down
(c) Constant
(d) None of these
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Slows down
Explanation:


25. Reverse reaction _____________ gradually.
(a) Speeds up
(b) Slows down
(c) Constant
(d) None of these
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Speeds up
Explanation:


26. In ______, two Norwegian chemists proposed the law of mass of action.
(a) 1854
(b) 1864
(c) 1874
(d) None of these
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1864
Explanation:


27. According to the law of mass action, the rate of chemical reaction is __________ to the product of the active masses of the reacting substances.
(a) Inversely proportional
(b) Constant
(c) Directly proportional
(d) None of these
Show Answer

Directly proportional
Explanation:


28. The term “active mass” represents concentration of reactant and products in ______________.
(a) {Mol.dm^{-3} }
(b) Hertz
(c) Amu
(d) None of these
Show Answer

{Mol.dm^{-3} }
Explanation:


29. R_f \prop ________________.
(a) [A]/[B]
(b) [A][B]
(c) [A]+[B]
(d) None \ of \ these
Show Answer

[A][B]
Explanation:


30. At equilibrium state, R_f __________ R_r .
(a) =
(b) >
(c) \div
(d) None \ of \ these
Show Answer

=
Explanation:


31. \frac{k_f}{k_r}= ______________.
(a) K_c
(b) K_E
(c) K_k
(d) None \ of \ these
Show Answer

K_c
Explanation:


32. Equilibrium cannot be attained in ____________container.
(a) Close
(b) open
(c) Semi-open
(d) None of these
Show Answer

open
Explanation:


33. In Birk land- Eyde process, nitrogen produces__________.
(a) Sulphuric acid
(b) Nitrous acid
(c) Nitric acid
(d) None of these
Show Answer

Nitric acid
Explanation:


34. In Haber’s process, Nitrogen reacts with hydrogen and produce_________.
(a) Ammonia
(b) Ammonium ion
(c) Ammonical liquor
(d) None of these
Show Answer

Ammonia
Explanation:


35. Refractrometry ,polarimetry, spectrophotometry are the _______ methods to recognize equilibrium.
(a) Chemical
(b) Physical
(c) Analytical
(d) None of these
Show Answer

Physical
Explanation:


36. _______________ is the chemical method to recognize chemical equilibrium.
(a) Ultrasonificaiton
(b) Galvanization
(c) titration
(d) None of these
Show Answer

titration
Explanation:


37. A __________ is a substance that changes the rate of a chemical reaction by remains chemically unchanged itself.
(a) Catalyst
(b) Isotope
(c) An acid
(d) None of these
Show Answer

Catalyst
Explanation:


38. Equilibrium constant is the ratio of the product of the concentration of the reactants at __________ state.
(a) Forward
(b) Reverse
(c) Equilibrium
(d) None of these
Show Answer

Equilibrium
Explanation:


39. The unit of ________ depends on the equilibrium constant expression for the given reaction.
(a) K_f
(b) K_c
(c) K_r
(d) Both \ a \ and \ b
Show Answer

K_c
Explanation:


40 K_c has ________ for a reaction in which the number moles of reactants and products are equal.
(a) No unit
(b) Two units
(c) Singular unit
(d) None of these
Show Answer

No unit
Explanation:


41. The value of equilibrium constant can be calculated if we know the _______ of reactants and products in the equilibrium mixture.
(a) Concentration
(b) Molar mass
(c) Formula unit
(d) Both a and b
Show Answer

Concentration
Explanation:


42. When the [Product] / [Reactants] ration is _________ K_c , the system will be not in equilibrium.
(a) Greater than
(b) less than
(c) Equals to
(d) None of these
Show Answer

less than
Explanation:


43. When the [Product] / [Reactants] ration is less than K_c , the system will move in the _______________ direction.
(a) Reverse
(b) Constant
(c) Forward
(d) None of these
Show Answer

Forward
Explanation:


44. When the ration of [Product] / [Reactants] is ____________ K_c , the system will not be in equilibrium.
(a) Greater than
(b) Less than
(c) Equals to
(d) None of these
Show Answer

Greater than
Explanation:


45. When the ratio of [Product] / [Reactants] is greater than K_c , the system will move in the direction.
(a) Forward.
(b) Reverse.
(c) Constant
(d) None of these
Show Answer

Reverse
Explanation:


46. When [Product] / [Reactants] ratio is __________ to K_c , then the system will establish equilibrium.
(a) Grater
(b) Lesser
(c) Equals to
(d) None of these
Show Answer

Equals to
Explanation:


47. The extort of reaction depends upon the ____________ of K_c .
(a) Magnitude
(b) Ration
(c) Atomic number
(d) None of these
Show Answer

Magnitude
Explanation:


48. When the concentration of reactants and products will be very close, the K_c , value will be close to ________.
(a) 12.2
(b) 1.0
(c) -1.20
(d) None of these
Show Answer

1.0
Explanation:


49. At dynamic equilibrium.
(a) Reverse reaction stops
(b) Forward reaction stops
(c) Both a and b
(d) None of these
Show Answer

Forward reaction stops
Explanation:


50. A reversible reaction have the following characteristics EXCEPT:
(a) Proceed in both direction
(b) They never complete
(c) Products do not form reactants again
(d) They are represented by \rightleftharpoons .
Show Answer

Products do not form reactants again
Explanation:


Chemistry Class 10 MCQs (All Chapters)


Jawad Khan

Jawad Khan

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