Question # 1

What will hapen to the concentrations of the prodcut if a reversible reaction at eqiulibrium is not distrubed.

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They will keepon increasing

They will keep on decreasing

They will remain constant

They willremain constant for some time and then start decreasing

Which of the following does not happpen, when a system is at equilibrium state.

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Reaction continues to occur in both the directions

Concentration of reactants and products stop changig

Forward and reverse reactions stop

Forward and reverse rates become equal

The new substance formed in a chemcial reaction is.

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Reverse

Reactant

Forward

Product

In an irreversibel reaction equiirbrium is.

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The forward reaction will be fovoured

No effect on forward or backward reaction

No effect on bakcwars reaction

The backward reaction will be favoured

The colour of anhydrous cobalt(II) cholride solid

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White

Black

Pink

Blue

When the rate of the forward reaction takes place at the rate of reverse reaction the composition of the reaction mixgure remains consant. It is called.

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Chemical Equilibrium

Static equilirbirum

Both a and b

None of the above

The characteristics of reversible reactions are the following except.

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Product nver recombine to form reactants

They never complete

They have a double arrow between reactants and products

The proceed in both ways

Formation of ammonia from Nitrogen and hydrogen is an.

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Exothermic reaction

Endothermic reaction

Both a and b

No heat change

In the beginning the rate of reverse reaction is.

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Slow

very fast

Moderate

Negligible

Whcih is true about the equilibrium state?

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The forard reaction stops

Both forward and reverse reactions stop

Both foward and reverse reactions continue at the same rate

The reverse reaction stops

A reverse reaction is one that

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Speeds up gradually

Proceeds from left to right

In which reactants react to form products

Slow down gradually

The colour of hydrated cobalt(II) chloride solid is

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White

Black

Blue

Pink

Concentratin of reactants and product at equilibrium remains unchanged if

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Concentration of any reactant or product is not changed

Temperaure of the reation is not changed

Pressure or volume of the system is not changed

All of the above are observed

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Chemistry 9th Class English Medium Unit 6 Online Test MCQs With Answers

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