Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below :

$Br{O}_4^{-} \stackrel{1.82}{\to }Br{O}_3^{-}\stackrel{1.5 V}{\to }HBrO\stackrel{1.595}{\to }B{r}_2\stackrel{1.0652 V}{\to }B{r}^{-}$

Then the species undergoing disproportionation is

• $Br{O}_3^{-}$

• $Br{O}_4^{-}$

• HBrO

• Br₂

Which one of the following conditions will favour maximum formation of the product in the reaction,

$$\begin{gathered} A_2 \left(g\right)\hspace{0.17em} + B_2 \left(g\right) \stackrel{ }{\leftrightharpoons } X_2 \left(g\right) \\ {∆}_r H = - XkJ? \end{gathered}$$

• Low temperature and high pressure

• Low temperature and low pressure

• High temperature and low pressure

• High temperature and high pressure

The bond dissociation energies of X₂, Y₂ and XY are in the ratio of 1 : 0.5: 1. ΔH for the formation of XY is –200 kJ mol–1. The bond dissociation energy of X₂ will be

• 200 kJ mol^-1

• 100 kJ mol^-1

• 400 kJ mol^-1

• 800 kJ mol^-1

The correction factor ‘a’ to the ideal gas equation corresponds to

• Density of the gas molecules

• Volume of the gas molecules

• Forces of attraction between the gas molecules

• Electric field present between the gas molecules

5.

Which one is a wrong statement?

• Total orbital angular momentum of electron in 's' orbital is equal to zero

• An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantum numbers

• The value of m for d_z2 is zero

• The electronic configuration of N atom is

  

Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s² 2s² 2p³, the simplest formula for this compound is

• Mg₂X₃

• MgX₂

• Mg₃X₂

• Mg₂X

The correct order of atomic radii in group 13 elements is

• B < Al < In < Ga < Tl

• B < Al < Ga < In < Tl

• B < Ga < Al < In < Tl

• B < Ga < Al < Tl < In

Which of the following oxides is most acidic in nature?

• MgO

• BeO

• CaO

• BaO

Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity?

• N₂O₅

• NO₂

• NO

• N₂O

Which of the following molecules represents the order of hybridisation sp², sp², sp, sp from left to right atoms?

• HC≡C-C≡CH

• CH₂=CH-C≡CH

• CH₃-CH=CH-CH₃

• CH₂=CH-CH=CH₂