Question # 1

The value of equilibrium constant (Kc) depends only on:

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temperature

Pressure

concentration

density

Which chemical is called king of chemicals?

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KNO₃

H₂SO₄

HCl

NHO₃

Which colour of HI is ?

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Orange

Purple

Red

Colourless

When a system is at equilibrium states?

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The concentration of reactants and products becomes equal

The opposing reactions

The rate of the reverse reaction becomes very low

The rates of the forward and reverse reactions becomes equal.

Guldberg and waage out forward law of mass action in:

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1889

1879

1869

1859

For reactions having large Kc value, the reaction proceeds to:

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Completion

Equilibrium state

back ward

None of these

The major components of Atmosphere are:

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Carbon and Nitrogen

Nitrogen and Oxygen

Oxygen and Chlorine

None of these

In chemical reaction , the substances that combine are called.

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Reactants

Products

Equlibrium

Numerator

The lives of aquatic plants and animals are indirectly related to concentration of dissolved ------ in water:

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hydrogen

oxygen

chlorine

nitrogen

The reaction goes from left to right , if:

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Qc = Kc

Qc > kc

Qc<Kc

Qc = 0

When the magnitude of Kc is very large in indicates.

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Reaction never go to completion

Reaction is in equilibrium state

Reaction will complete after some time

Reaction has almost to completion

At dynamic equilibrium:

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The reactions stops to proceed

The amounts of reactants and products are equal

The speed of the forward is reverse reactions are equal

The reaction can no longer be reversed

When CaCO_3,.is heated in an open flask, it decomposes to form calcium oxides and .

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O₂

CO

CO₂

CO₃

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