Question # 1

In the beginning the rate of reverse reaction is.

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Slow

very fast

Moderate

Negligible

CaO or lime is used extensive in steel, glass and paper industries. It is produced inan exothermic reversitble reaction by the decompositon of lie . Choose the conditions to produce maximum amount of lime.

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Heating at high temperatur ein an open vessel

Heating at high temperatur ein a closed vessel

Cooling it in a closed vessel

Colling it in an open vessel

Formation of ammonia from Nitrogen and hydrogen is an.

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Exothermic reaction

Endothermic reaction

Both a and b

No heat change

The colour of anhydrous copper (II)sulphate solid is

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Pink

Black

White

Blue

Why the gas starts coming out when you open a can of fizzy drink.

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Because gteh solubiliyt of the gas increases

Because the gas is dissolved under pressure hence it comes out when pressur eis decreased

Becaue the gas is insoluble in water

Because the solubility of hte gas decreases at high pressure.

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

Such reaction which continue in both directins are called.

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Dynamic

Irreversible

Reversible

Non- reactive

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

Which compound is used a thinner is paint industry?

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H2O

C2H3OH

CH3COOC2H5

CH3COOH

The colour of anhydrous cobalt(II) cholride solid

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White

Black

Pink

Blue

What conditon Should be met for the reversible reactio to achieve the state of equilibrium.

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The concentratio of all the reactants and the prodduct should become constant

all the reactants should be converted into the product

50% of the reactant shuld be converted into prodcuts.

One of the product should be removed from the reaction mixture.

The reaction in which the products can recombine to formreactants are called.

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Reversible Reaction

Irreversible reactions

Decomposition reactions

Addition reactions

What will happen if the rates of forward and reverse reactions are very high

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The reaction will be practiclly irreversible

The equilibrium point will reach very soon

The equilibiurm point will reach very late

The reaction will not attain the state of dynamic equilibrium

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

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