AIPMT 2012 Mock Test

In which of the following arrangements the given sequence is NOT strictly according to the property indicated against it?

Consider the reaction:
$$\text{RCHO}+{\text{NH}}_2{\text{NH}}_2\to \text{RCH}=\text{N}-{\text{NH}}_2+{\text{H}}_2\text{O}$$
What sort of reaction is it?

During change of ${\text{O}}_2$ to ${\text{O}}_2^{-}$ ion, the electron adds on which one of the following orbitals?

Standard reduction potentials of the half reactions are given below:${\text{F}}_{2(\text{g})}+2e^{-}\to 2{\text{F}}_{(\text{aq})}^{-};E^{\circ }=+2.85\text{V}$${\text{Cl}}_{2(\text{g})}+2e^{-}\to 2{\text{Cl}}_{(\text{aq})}^{-};E^{\circ }=+1.36\text{V}$${\text{Br}}_{2(\text{g})}+2e^{-}\to 2{\text{Br}}_{(\text{aq})}^{-};E^{\circ }=+1.06\text{V}$${\text{I}}_{2(\text{g})}+2e^{-}\to 2{\text{I}}_{(\text{aq})}^{-};E^{\circ }=+0.53\text{V}$ The strongest oxidising and reducing agents respectively are:

The catalytic activity of transition metals and their compounds is ascribed mainly to: