JEE Main 2012 — Inorganic Chemistry

The $d$-electron configurations of $\mathrm{Cr}^{2+}, \mathrm{Mn}^{2+}, \mathrm{Fe}^{2+}$ and $\mathrm{Co}^{2+}$ are $d^4, d^5, d^6$ and $d^7$ respectively. Which one of the following will exhibit the lowest paramagnetic behaviour? (Atomic no. $\mathrm{Cr}=24, \mathrm{Mn}=25, \mathrm{Fe}=26, \mathrm{Co}=27$ ).

The number of $\mathrm{S}-\mathrm{S}$ bonds in $\mathrm{SO}_3, \mathrm{~S}_2 \mathrm{O}_3^{2-}$ $\mathrm{S}_2 \mathrm{O}_6^{2-}$ and $\mathrm{S}_2 \mathrm{O}_8^{2-}$ respectively are

How many cyclic structures are possible for $\mathrm{C}_4 \mathrm{H}_6$ ?

The number of unpaired electrons in Gadolinium $[\mathrm{Z}=64]$ is

Which is not the correct Statement? (At. nos. $\mathrm{Ce}=58, \mathrm{Lu}=71, \mathrm{La}=57, \mathrm{Yb}=70$ )

Which pair of elements with the given atomic numbers is expected to have similar properties?

In which of the following pairs the two species are not isostructural?

Magnetic moment of $\mathrm{Gd}^{3+}$ ion $(\mathrm{Z}=64)$ is

Which one of the following will react most vigorously with water?

Which of the following presents the correct order of second ionization enthalpies of $\mathrm{C}, \mathrm{N}, \mathrm{O}$ and $\mathrm{F}$ ?

Among the following, the species having the smallest bond is

Dipole moment is shown by

Although $\mathrm{CN}^{-}$ion and $\mathrm{N}_2$ molecule are isoelectronic, yet $\mathrm{N}_2$ molecule is chemically inert because of

Reagent used to convert allyl alcohol to acrolein is

The complex ion $\left[\operatorname{Pt}\left(\mathrm{NO}_2\right)(\mathrm{Py})\left(\mathrm{NH}_3\right)\left(\mathrm{NH}_2 \mathrm{OH}\right)\right]^{+}$ will give

The compound of xenon with zero dipole moment is

The molecule having smallest bond angle is :

Which among the following will be named as dibromidobis (ethylene diamine)chromium(III) bromide?

Among the following, the molecule with the lowest dipole moment is

Square-planar geometry is shown by

Based on lattice energy and other considerations, which one of the following alkali metal chloride is expected to have the highest melting point?

Among the following chloro-compound having the lowest dipole moment is

The formation of molecular complex $\mathrm{BF}_3-\mathrm{NH}_3$ results in a change in hybridization of boron

The correct order of ligands in the spectrochemical series is

Which of the following has the square planar structure?

In which of the following arrangements, the sequence is not strictly according to the property written against it?

Among the following species which two have trigonal pyramidal shape? (I) $\mathrm{NI}_3$ (II) $\mathrm{I}_3^{-}$ (III) $\mathrm{SO}_3^{2-}$ (IV) $\mathrm{NO}_3^{-}$

Which of the following forms stable $+4$ oxidation state?

Which of the oxide groups among the following cannot be reduced by carbon?

Which of the following complex ions will exhibit optical isomerism? (en = 1, 2-diamine ethane).

Iron exhibits $+2$ and $+3$ oxidation states. Which of the following statements about iron is incorrect?

Which among the following elements has the highest first ionization enthalpy?