Question # 1

The plant use

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Carbon di oxide

Oxygen

Nitrogen

Sulphur

Such reactions which continue in both directions are called.

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Irreversible

Reversible

Nonreactive

Dynamic

A reverse reaction is that.

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Which proceed from left to high

In which reactants reacts to form products

Which slow down gradually

Which speed up gradually

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.

The color of Iodine is:

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Purple

Black

Red

Pink

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 % age of nitrogen and oxygen in our atmosphere is:

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80

90

95

99

We exhale gas in the atmosphere during respiration.

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Carbon dioxide

Oxygen

Nitrogen

Water

When the numbers of moles of both sides are equal in a reaction, then the unit of K_c will be:

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No unit

mol^-2 dm⁶

mol dm³

mol^-2dm

When the number of moles of both sides are equal in a reaction then the unit of Kc will be:

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no unit

mol-2 dm6

mol dm3

mo-2 dn

The unit of molar concentration:

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mol. dm^-2

mol. dm^-1

mol. dm

mol. dm^-3

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

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temperature

Pressure

concentration

density

An equilibrium is achievable only in a:

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big system

small system

open system

closed system

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