Question # 1

If Qc = Kc the reaction goes in:

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Forward

Reverse

At equilibrium state

None

The lives of aquatic plants and animals are indirectly related to concentration of dissolved ------ in water:

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hydrogen

oxygen

chlorine

nitrogen

Which one of the following statements is not correct about active mass?

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Rate of reaction is directly proportional to activ emass.

Active mass is taken in molar concentration

Active mass is represented by square brackets

Active mass means total mass of substances.

The % age of nitrogen and oxygen in our atmosphere is:

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80

90

95

99

when a system is in equilibrium state or in dynamic equilibrium state.

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Reactants and product are equal

Forward reactions stops

Reverse reactions stops

Forward reaction rate and reverse reaction rate

We exhale gas in the atmosphere during respiration.

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Carbon dioxide

Oxygen

Nitrogen

Water

When the magnitude of Kc is very small it indicates.

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Equilibrium will never establish

All reactants will be converted to products.

Reaction will go to completion

The amount of products is negligible

For which reaction Kf is the rate constant?

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Forward reaction

Backward reaction

Upward reaction

Downward reaction

The characteristics of reversible reactions are the following except:

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Products never recombine to form reactants.

They never complete

The proced in both ways

They have a double arrow between reactants and products.

Which gas is used to manufacture king of chemicals sulphuric acid?

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N₂

O₂

Cl₂

S

The reaction in which the products do not recombine to form reactants are called.

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Inversible reactions

Reversible reaction

Decomposition

Addition

Equilibrium constant has no unit when number of moles of reactants and products are:

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same

Different

Both a and b

None of these

In chemical reaction , the substances that combine are called.

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Reactants

Products

Equlibrium

Numerator

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Chemistry 10th Class English Medium Unit 9 Online Test MCQs With Answers

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