Question # 1

The colour of hydrated cobalt(II) chloride solid is

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White

Black

Blue

Pink

The new substance formed in a chemcial reaction is.

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Reverse

Reactant

Forward

Product

The colour of anhydrous cobalt(II) cholride solid

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White

Black

Pink

Blue

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

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.

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 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

In chemical reaction, the substances that combine are called.

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Masses

Materials

Products

Reactants

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

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 reaction in which the products do not reombine to form reatants are called

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Addition reactions

Decomposition reactions

Irreversitble reactions

reversible reactions

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

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

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

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