Question # 1

The rate of reverse reaction in the beginning.

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Slow

moderate

Very fast

Low

The characteristics of reversible reactions are the following except:

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Products never recombine to form reactants.

They never complete

The proced in both ways

They have a double arrow between reactants and products.

The unit of molar concentration:

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mol. dm^-2

mol. dm^-1

mol. dm

mol. dm^-3

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

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O₂

CO

CO₂

CO₃

For which reaction Kf is the rate constant?

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Forward reaction

Backward reaction

Upward reaction

Downward reaction

When the magnitude of Kc is very large it indicates.

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Reaction mixture consist of almost all products.

Reaction mixture consist of almost all reactants.

Reaction has not gone to completion

Reaction mixture has negligible products.

For a reaction between PCL₃ and Cl₂ to form PCl₅ the units of Kc are:

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Mol dm^-3

Mol^-1 dm^-3

Mol^-1dm³

Mol dm³

A complete reaction is one is which.

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All the reactants convert into products.

All the reactants do not convert into products.

Half reactants convert into products.

Only 10% reactants convert into products.

The value of K_c depends on.

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Temperature

Pressure

Volume

Atmosphere

The substances formed during the chemical reaction are called.

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Product

Reactants

Radicals

Element

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

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Chemical states

Static state

Physical state

Dynamic equilibrium state

Guldberg and waage put forward law of mass action in:

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1860

1869

1870

1879

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