11.

According to the first law of thermodynamics which of the following quantities represents the change in a state function?

• q_rev + W_rev

• q_rev

• q_rev - W_rev

• q_rev / W_rev

The aqueous solution of which of the salt has pH close to 7?

• FeCl₃

• CH₃COONa

• KCN

• CH₃COONH₄

Consider the following reactions in which all the reactants and the products are in gaseous state

  $$\begin{gathered} 2\mathrm{PQ} \rightleftharpoons {\mathrm{P}}_2 + {\mathrm{Q}}_2; {\mathrm{K}}_1 = 2.5 \times {10}^5 \\ \mathrm{PQ} + \frac{1}{2}{\mathrm{R}}_2 \rightleftharpoons \mathrm{PQR}: {\mathrm{K}}_2 = 5 \times {10}^{-3} \\ \mathrm{The} \mathrm{value} \mathrm{of} {\mathrm{K}}_3 \mathrm{for} \mathrm{the} \mathrm{equilibrium} \frac{1}{2}{\mathrm{P}}_2 +\frac{1}{2}{\mathrm{Q}}_2 +\frac{1}{2}{\mathrm{R}}_2 \rightleftharpoons \mathrm{PQR}, \mathrm{is} \end{gathered}$$

• 2.5 × 10^-3

• 2.5 × 10³

• 1.0 × 10^-5

• 5 × 10³

200 mL of water is added to a 500 mL of 0.2 M solution. What is the molarity of this diluted solution?

• 0.5010M

• 0.2897M

• 0.7093

• 0.1428

If the activation energy for the forward reaction is 150 kJ mol^-1 and that of the reverse reaction is 260 kJ mol^-1, what is the enthalpy change for the reaction?

• 410 kJ mol^-1

• 110kJ mol^-1

• -110 kJ mol^-1

• -410 kJ mol^-1

All carbon atoms are sp²-hybridised in

• 1, 3-butadiene

• CH₂=C=CH₂

• cyclohexane

• 2-butene

The decreasing order of acidic character among ethane (I), ethene (II), ethyne (III) and propyne (IV) is

• (I) > (II) > (III) > (IV)

• (II) > (III) > (I) > (IV)

• (III) > (IV) > (II) > (I)

• (IV) > (III) > (II) > (I)

The alkene that will give the same product with HBr in the absence as well as in the presence of peroxide is

• 2-butene

• 1-butene

• propene

• 2-methylpropene

Hyperconjugation is most useful for stabilising which of the following carbocations?

• Neo-pentyl

• Tert-butyl

• Iso-propyl

• Ethyl

The isomerism that arises due to restricted bond rotation is

• metamerism

• optical isomerism

• position isomerism

• geometrical isomerism