91.

Which of the following is an example of interstitial hydride?

• NH₃

• CH₄

• ZnH₂

• H₂O

Identify the alkyne in the following sequence of reactions,

Alkyne _{$\underset{\mathrm{Lindlar}\text{'}\mathrm{s} \mathrm{catalyst}}{\overset{{\mathrm{H}}_2}{\to }}$ A $\stackrel{\mathrm{Ozonolysis}}{\to }$ B $\stackrel{\mathrm{Wacker} \mathrm{process}}{\leftarrow }$} CH₂=CH₂

• H₃C-C≡C-CH₃

• H₃C-CH₂-C≡CH

• H₂C=CH-C≡CH

• HC≡C-CH₂-C≡CH

Which of the following is a correct statement?

• Aqueous solutions of Cu⁺ and Zn²⁺ are colourless

• Aqueous solutions of Cu²⁺ and Zn²⁺ are colourless

• Aqueous solution of Fe³⁺ is green in colour

• Aqueous solution of MnO^-₄ is colourless

The percentage of lanthanides and iron respectively in misch metal are

• 50, 50

• 75, 25

• 90, 10

• 95, 5

KO₂ exhibits paramagnetic behaviour. This is due to the paramagnetic nature of

• KO^-

• K⁺

• O₂

• O^-₂

Which one of the following ions has same number of unpaired electrons as those present in V⁺ ion?

• Fe³⁺

• Ni²⁺

• Mn²⁺

• Cr³⁺

Which of the following characteristics of the transition metals is associated with their catalytic activity?

• Colour of hydrated ions

• Diamagnetic behaviour

• Paramagnetic behaviour

• Variable oxidation states

What are X and Y in the following reactions?

$$\begin{gathered} {\mathrm{MnO}}_4^{-} + {\mathrm{I}}^{-} \stackrel{{\mathrm{H}}^{+}}{\to } \mathrm{X} \\ {\mathrm{MnO}}_4^{-} + {\mathrm{I}}^{-} \stackrel{{\mathrm{H}}_2\mathrm{O}}{\to } \mathrm{Y} \end{gathered}$$

• ${\mathrm{I}}_2, {\mathrm{IO}}_4^{-}$

• ${\mathrm{I}}_2, {\mathrm{IO}}_3^{-}$

• ${\mathrm{IO}}_3^{-}, {\mathrm{IO}}_3^{-}$

• ${\mathrm{IO}}_3^{-},{\mathrm{I}}_2,$

Which of the following transition metals shows the highest oxidation state?

• Sc

• Ti

• Mn

• Zn

Which of the ions having following electronic structure would have maximum magnetic moment?

• 1s², 2s², 2p⁶,3s²,3p⁶,3d³

• 1s², 2s², 2p⁶,3s²,3p⁶,3d⁵

• 1s², 2s², 2p⁶,3s²,3p⁶,3d⁷

• 1s², 2s², 2p⁶,3s²,3p⁶,3d⁹