At dynamic equilibrium what is equal?

Forward and backward reaction rates

Concentrations of all substances

Masses of reactants and products

Class 9 Chemistry · Chapter 6 · Test 9

Mixed Conceptual Problems

25 MCQs covering reversible reactions, dynamic equilibrium, concentration, temperature, pressure, catalysts, hydrated compounds, and industrial equilibrium applications.

MCQs

25 questions · 20 min · 25 marks

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Sample questions

The first 5 of 25. Try each one, then tap to see the answer.

Question 1
Which symbol represents a reversible reaction?
- A→
- B⇌
- C=
- D↑
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Answer: B
The symbol ⇌ shows that a reaction can proceed in both forward and backward directions.
Question 2
At dynamic equilibrium what is equal?
- AConcentrations of all substances
- BForward and backward reaction rates
- CMasses of reactants and products
- DNumbers of molecules
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Answer: B
At dynamic equilibrium the forward and backward reaction rates are equal.
Question 3
In N2 + 3H2 ⇌ 2NH3 how many moles of gas are present on the reactant side?
- A2
- B3
- C4
- D5
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Answer: C
There is 1 mole of nitrogen and 3 moles of hydrogen giving 4 moles of gas.
Question 4
In N2 + 3H2 ⇌ 2NH3 how many moles of gas are present on the product side?
- A1
- B2
- C3
- D4
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Answer: B
There are 2 moles of ammonia gas on the product side.
Question 5
What happens when pressure is increased in N2 + 3H2 ⇌ 2NH3?
- AEquilibrium shifts left
- BEquilibrium shifts right
- CThere is no shift
- DThe reaction stops
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Answer: B
Increasing pressure favors the side with fewer gas moles which is the ammonia side.

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