11.

A bubble of air is underwater at temperature 15°C and the pressure 1.5 bar. If the bubble rises to the surface where the temperature is 25°C and the pressure is 1.0 bar, what will happen to the volume of the bubble?

• Volume will become greater by a factor of 1.6

• Volume will become greater by a factor of 1.1

• Volume will become smaller by a factor of 0.70

• Volume will become greater by a factor of 2.9

The pairs of species of oxygen and their magnetic behaviours are noted below. Which of the following presents the correct description?

• ${\mathrm{O}}_2^{-}, {\mathrm{O}}_2^{2-}$ - Both diamagnetic 

• ${\mathrm{O}}^{+}, {\mathrm{O}}_2^{2-}$ - Both diamagnetic 

• ${\mathrm{O}}_2^{+}, {\mathrm{O}}_2$ - Both diamagnetic 

• $\mathrm{O}, {\mathrm{O}}_2^{2-}$ - Both diamagnetic 

Which of the following species is not electrophilic in nature?

• $\stackrel{\oplus }{\mathrm{C}}\mathrm{l}$

• BH₃

• ${\mathrm{H}}_3\stackrel{\oplus }{\mathrm{O}}$

• $\stackrel{\oplus }{\mathrm{N}}{\mathrm{O}}_2$

Some statements about heavy water are given below.
(i) Heavy water is used as moderator in nuclear reactors.
(ii) Heavy water is more associated than ordinary water.
(iii) Heavy water is more effective solvent than ordinary water.
Which of the above statements are correct?

• (i) and (ii)

• (i), (ii) and (iii)

• (ii) and (iii)

• (i) and (iii)

Which of the following conformers for ethylene glycol is most stable?

The IUPAC name of the compound ${\mathrm{CH}}_3\mathrm{CH}=\mathrm{CHC}\equiv \mathrm{CH} \mathrm{is}$ is

• pent-4-yn-2-ene

• pent-3-en-1-yne

• pent-2-en-4-yne

• pent-1-yn-3-ene

Which of the following compounds undergoes nucleophilic substitution reaction most easily?

Match List I with List II for the compositions of substances and select the correct answer using the codes given below the lists.

• A   B   C   D

  3   4   1   2

• A   B   C   D

  2   3   4    1

• A   B   C   D

  1   2   3    5

• A   B   C   D

  4   3   2    1

Consider the reactions,

$$\begin{gathered} ({\mathrm{CH}}_3{)}_2\mathrm{CH}-{\mathrm{CH}}_2\mathrm{Br} \stackrel{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}}{\to }({\mathrm{CH}}_3{)}_2\mathrm{CH}-{\mathrm{CH}}_2{\mathrm{OC}}_2{\mathrm{H}}_5 + \mathrm{HBr} \\ ({\mathrm{CH}}_3{)}_2\mathrm{CH}-{\mathrm{CH}}_2\mathrm{Br} \stackrel{{\mathrm{C}}_2{\mathrm{H}}_5{\mathrm{O}}^{-}}{\to }({\mathrm{CH}}_3{)}_2\mathrm{CH}-{\mathrm{CH}}_2{\mathrm{OC}}_2{\mathrm{H}}_5 + {\mathrm{Br}}^{-} \end{gathered}$$

The mechanisms of reactions (i) and (ii) are respectively

• S_N 1 and S_N2

• S_N 1 and S_N1

• S_N 2 and S_N 2

• S_N 2 and S_N1

Which of the following oxide is amphoteric?

• SnO₂

• CaO

• SiO₂

• CO₂