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5/27 MCQs for:

MATTER: PROPERTIES AND TRANSFORMATION: Reversible Reactions

__ is one which does not allow materials to either enter or leave.

An open system.

A closed system.

A system.

Reaction system.

Consider the following systems in equilibrium:

N_{2 (g)} (1 mole) + 3H_{2 (g)}(3 moles) ⇌ 2NH_{3 (g)} (2 moles) ---------------------- (1)

For system (1):

If pressure is reduced, the equilibrium will shift to the left to produce more gas molecules thereby increasing the pressure of the system in accordance with Le Chatelier’s principle.

4 moles of gas molecules on the LHS and 2 moles on the RHS.

If pressure is increased, the equilibrium position will shift to the right to produce fewer gas molecules thereby reducing the pressure of the system according to Le Chatelier’s principle.

All are correct.

A reversible reaction is represented by the sign:

⇄ between reactants and products.

⇾ between reactants and products.

⇌ between reactants and products and ⇄ between reactants and products.

⇌ between reactants and products.

Le Chatelier’s principle states that:

If a chemical system in equilibrium is subjected to a change, such as a change in concentration, temperature or pressure, the position of equilibrium will not shift in such a direction as to annul or oppose the effect of the change.

If a chemical system in equilibrium is subjected to a change, such as a change in concentration, temperature or pressure, the position of equilibrium will shift in such a direction as to annul or oppose the effect of the change.

If a chemical system in equilibrium is subjected to any change, the position of equilibrium will shift in such a direction as to annul or oppose the effect of the change.

If a physical system in equilibrium is subjected to a change, such as a change in concentration, temperature or pressure, the position of equilibrium will shift in such a direction as to annul or oppose the effect of the change.

Examples of reversible reactions include the following except:

N_{2 (g)} + 3H_{2 (g)} ⇌ 2NH_{3 (g)}.

2SO_{2 (g)} + O_{2 (g)} ⇌ 2SO_{3 (g)}.

CuSO₄.5H₂O_(s) ⇌ CuSO_{4 (s)} + 5H₂O_(l).