Question # 1

If reversibe reaction useful for preparing compounds on large scale.

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Yes

No

They are useful only when equilirbium lies far to the left side

They are useful only when equilibrium lies far to the right side

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.

Predict which components of the amosphere react in the presence of lightening.

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N2 and H2O

O2 and H2O

N2 and O2

CO2 and O2

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

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

In chemical reaction, the substances that combine are called.

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Masses

Materials

Products

Reactants

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

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

How much heat absorbed when NH3decomposed into N2 and H2?

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90.4 kJ/mol

92.4 kJ/mol

94.2 kJ/mol

95.2 kJ/mol

In the beginning the rate of reverse reaction is.

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Slow

very fast

Moderate

Negligible

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.

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

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