A reversible reaction is said to have attained equilibrium, when

1. Backward reaction stops

2. Both backward and forward reactions take place at equal speed

3. Both backward and forward reactions stop

4. Concentration of each of the reactants and products becomes equal

In what manner will increase of pressure affect the following equation?

$\mathrm{C}\left(\mathrm{s}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)\rightleftharpoons \mathrm{CO}\left(\mathrm{g}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)$

1. Shift in the reverse direction

2. Shift in the forward direction

3. Increase in the yield of hydrogen

4. No effect

The equilibrium between water and its vapour, in an open vessel

1. Can be achieved

2. Depends upon pressure

3. Cannot be achieved

4. Depends upon temperature

Which of the following equilibrium, in gaseous phase, would be unaffected by an increase in pressure?

1. ${\mathrm{N}}_2+3{\mathrm{H}}_2\rightleftharpoons 2{\mathrm{NH}}_3$

2. ${\mathrm{N}}_2+{\mathrm{O}}_2\rightleftharpoons 2\mathrm{NO}$

3. ${\mathrm{N}}_2{\mathrm{O}}_4\rightleftharpoons 2{\mathrm{NO}}_2$

4. ${\mathrm{CO}}_2+\frac{1}{2}{\mathrm{O}}_2\rightleftharpoons {\mathrm{CO}}_2$

A saturated solution of non-radioactive sugar was taken and a little radioactive sugar was added to it. A small amount of it gets dissolved in solution and an equal amount of sugar was precipitated. This proves:

1. The equilibrium has not been established in the solution.

2. Radioactive sugar can displace non-radioactive sugar from its solution.

3. Equilibrium is dynamic in nature.

4. None of the above

When two reactants A and B are mixed to give products C and D, the reaction quotient Q, at the initial stages of the reaction

1. is zero

2. decreases with time

3. is independent of time

4. increases with time

A vessel at equilibrium, contains SO₃, SO₂ and O₂. Now some helium gas is added, so that total pressure increasese while temperature and volume remain constant. According to Le Chatelier's Principle, the dissociation of SO₃ 

1. Decreases

2. Remains unaltered

3. Increases

4. Change unpredictably

A chemical reaction is catalysed by a catalyst X. Hence, X

1. Increases activation energy of the reaction

2. Does not effect equilibrium constant of the reaction

3. Decreases rate constant of the reaction

4. Reduces enthalpy of the reaction

If for the reaction given below

$\underset{\mathrm{g}}{2\mathrm{PQ} }\rightleftharpoons \underset{\mathrm{g}}{ {\mathrm{P}}_2 }+\underset{\mathrm{g}}{ {\mathrm{Q}}_2 ; }{\mathrm{K}}_1=2.5\times {10}^5$
$\underset{\mathrm{g}}{\mathrm{PQ} }+ \frac{1}{2}\underset{\mathrm{g}}{{\mathrm{R}}_2 }\rightleftharpoons \underset{\mathrm{g}}{\mathrm{PQR}; }{\mathrm{K}}_2=5\times {10}^{-3}$

find K₃ for the reaction $\frac{1}{2}{\mathrm{P}}_2 + \frac{1}{2}{\mathrm{Q}}_2 +\frac{1}{2}{\mathrm{R}}_{2 }\rightleftharpoons \mathrm{PQR}$

1. $2.5\times {10}^{-3}$

2. $2.5\times {10}^3$

3. $1\times {10}^{-5}$

4. $5\times {10}^{-3}$

For equilibrium reaction

$\mathrm{}$
2NO₂(g) ⇌ N₂O₄(g) + 14.6 J, increase in temperature would

1. Favour the formation of N₂O₄

2. Stop the reaction

3. Favour the decomposition of N₂O₄

4. Not alter the equilibrium