Question # 1

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

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Reversible Reaction

Irreversible reactions

Decomposition reactions

Addition reactions

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 hydrated cobalt(II) chloride solid is

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White

Black

Blue

Pink

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

Which compound is used a thinner is paint industry?

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H2O

C2H3OH

CH3COOC2H5

CH3COOH

At what temperature , rate of ammonia formation and decomposition is the highest.

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200 ^oC

300^oC

400 ^oC

500 ^oC

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

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

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.

When system is at quilibrium state.

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The rate of the forward and reverse rections become equal

The concentrationof reatants and product becoes equal

The oposing reactions stop

The rate of the reverse reactio becomes very low

Industrialy, ammonia is produced by which process.

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Halogenation

Solvay process

Haber Process

Hydrogenation

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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