Question # 1

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.

When a reaction ceases to proceed further , it is called.

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Chemical states

Static state

Physical state

Dynamic equilibrium state

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

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temperature

Pressure

concentration

density

Which type of reactions take place in both directions?

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Addition reactions

Reversible reactions

Irreversibel reactions

Decomposition reactions

Who proposed "Law of mass action"?

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Newton

Boyle

Guldberg and waage

Lavoisier

Such reationsin which reactants and products are sufficient in quantities the Kc value of equilibrium state will be

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Very small

Very large

Moderate

None of these

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

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O₂

CO

CO₂

CO₃

The reaction goes from left to right , if:

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Qc = Kc

Qc > kc

Qc<Kc

Qc = 0

Equilibrium constant has no unit when number of moles of reactants and products are:

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same

Different

Both a and b

None of these

Which chemical is called king of chemicals?

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KNO₃

H₂SO₄

HCl

NHO₃

The unit of molar concentration:

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mol. dm^-2

mol. dm^-1

mol. dm

mol. dm^-3

The substances formed during the chemical reaction are called.

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Product

Reactants

Radicals

Element

The two major components of atmosphere are:

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Hydrogen and oxygen

Nitrogen and Hydrogen

Nitrogen and oxygen

Oxygen and water.

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