Inorganic Chemistry PYQ

Identify the correct statements from the following A. $[Fe(C_2O_4)_3]^{3-}$ is the most stable complex among $[Fe(OH)_6]^{3-}$, $[Fe(C_2O_4)_3]^{3-}$ and $[Fe(SCN)_6]^{3-}$ B. The stability of $[Cu(NH_3)_4]^{2+}$ is greater than that of $[Cu(en)_2]^{2+}$ C. The hybridization of Fe in $K_4[Fe(CN)_6]$ is $d^2sp^3$ D. $[Fe(NO_2)_3Cl_3]^{3-}$ exhibits linkage isomerism E. $NO_2^-$ and $SCN^-$ ligands are NOT ambidentate ligands Choose the correct answer from the options given below :

$\left[\mathrm{Ni}\left(\mathrm{PPh}_{3}\right)_{2} \mathrm{Cl}_{2}\right]$ is a paramagnetic complex. Identify the INCORRECT statements about this complex. A. The complex exhibits geometrical isomerism. B. The complex is white in colour. C. The calculated spin-only magnetic moment of the complex is 2.84 BM . D. The calculated CFSE (Crystal Field Stabilization Energy) of Ni in this complex is $-0.8 \Delta_{\mathrm{o}}$. E. The geometrical arrangement of ligands in this complex is similar to that in $\mathrm{Ni}(\mathrm{CO})_{4}$. Choose the correct answer from the options given below :

Given below are two statements : Statement I: Presence of large number of unpaired electrons in transition metal atoms results in higher enthalpies of their atomisation. Statement II: $d_{xy} = d_{xz} = d_{yz} < d_{x^2-y^2} = d_{z^2}$ and $d_{x^2-y^2} = d_{z^2} < d_{xy} = d_{xz} = d_{yz}$ are the d-orbital splittings in $[Fe(H_2O)_6]^{3+}$ and $[Ni(Cl)_4]^{2-}$ complex ions respectively. In the light of the above statements, choose the correct answer from the options given below :

Given below are two statements : Statement I: $\quad\left[\mathrm{CoBr}_{4}\right]^{2-}$ ion will absorb light of lower energy than $\left[\mathrm{CoCl}_{4}\right]^{2-}$ ion. Statement II : In $\left[\mathrm{CoI}_{4}\right]^{2-}$ ion, the energy separation between the two set of d-orbitals is more than $\left[\mathrm{CoCl}_{4}\right]^{2-}$ ion. In the light of the above statements, choose the correct answer from the options given below :

Given below are two statements : Statement I : The number of compounds among SO$_2$, SO$_3$, SF$_4$, SF$_6$ and H$_2$S in which sulphur does not obey the Octet rule is $3$. Statement II : Among [H$_2$O, ClF$_3$, SF$_4$], [NH$_3$, BrF$_5$, SF$_4$], [BrF$_5$, ClF$_3$, XeF$_4$] and [XeF$_4$, ClF$_3$, H$_2$O], the number of sets in which all the molecules have one lone pair of electrons on the central atom is $1$. In the light of the above statements, choose the correct answer from the options given below :

Given below are two statements: Statement I: The second ionization enthalpy of B, Al and Ga is in the order of $B > Al > Ga$. Statement II: The correct order in terms of first ionization enthalpy is $Si < Ge < Pb < Sn$. In the light of the above statements, choose the correct answer from the options given below:

Identify the metal ions among $\mathrm{Co}^{2+}, \mathrm{Ni}^{2+}, \mathrm{Fe}^{2+}, \mathrm{V}^{3+}$ and $\mathrm{Ti}^{2+}$ having a spin-only magnetic moment value more than 3.0 BM. The sum of unpaired electrons present in the high spin octahedral complexes formed by those metal ions is $\_\_\_\_$.

Consider the metal complexes $[Ni(en)_3]^{2+}$ (A), $[NiCl_4]^{2-}$ (B) and $[Ni(NH_3)_6]^{2+}$ (C). Choose the CORRECT option by considering the number of unpaired electrons present in (A), (B) and (C) respectively and the order of frequency of absorption.

In the Group analysis of cations, $\mathrm{Ba}^{2+} ~\&~ \mathrm{Ca}^{2+}$ are precipitated respectively as

A paper dipped in a dil. $H_2SO_4$ solution of '$X$' upon treatment with $SO_2$ gas turns into green. The compound '$X$' is :

" X " is an oxoanion of the lightest element of group 7 (in the periodic table). The metal is in +6 oxidation state in " X ". The color of the potassium salt of X is

Which of the following elements has the highest electronegativity?

First and second ionization enthalpies of lithium are $520$ kJ mol$^{-1}$ and $7297$ kJ mol$^{-1}$ respectively. Energy required to convert $3.5$ mg lithium (g) into $\text{Li}^{2+}$(g) $[\text{Li(g)} \rightarrow \text{Li}^{2+}\text{(g)}]$ is _______ kJ mol$^{-1}$. (nearest integer) [Molar mass of Li $= 7$ g mol$^{-1}$]

It is noticed that $\mathrm{Pb}^{2+}$ is more stable than $\mathrm{Pb}^{4+}$ but $\mathrm{Sn}^{2+}$ is less stable than $\mathrm{Sn}^{4+}$. Observe the following reactions. $\mathrm{PbO}_{2}+\mathrm{Pb} \rightarrow 2 \mathrm{PbO} ; \Delta_{\mathrm{r}} \mathrm{G}^{\circ}(1)$ $\mathrm{SnO}_{2}+\mathrm{Sn} \rightarrow 2 \mathrm{SnO} ; \Delta_{\mathrm{r}} \mathrm{G}^{\circ}(2)$ Identify the correct set from the following

In a period, the first ionisation enthalpy of the element at extreme left and the negative electron gain enthalpy of the extreme right element, except noble gases, are respectively.

On heating a mixture of common salt and $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ in equal amount along with concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ in a test tube, a gas is evolved. Formula of the gas evolved and oxidation state of the central metal atom in the gas respectively are:

Bromine trifluoride autoionizes to form $\text{BrF}_2^{\oplus}$ and $\text{BrF}_4^{\ominus}$. The shapes of the cation and anion are respectively ________, and ________.

The statements that are incorrect about the nickel(II) complex of dimethylglyoxime are : A. It is red in colour. B. It has a high solubility in water at $\mathrm{pH}=9$. C. The Ni ion has two unpaired d-electrons. D. The $\mathrm{N}-\mathrm{Ni}-\mathrm{N}$ bond angle is almost close to $90^{\circ}$. E. The complex contains four five-membered metallacycles (metal containing rings). Choose the correct answer from the options given below :

In period 4 of the periodic table, the elements with highest and lowest atomic radii are respectively.

Given below are two statements: Statement I: Aluminium is more electropositive than thallium as the standard electrode potential value of $E^{\circ}_{\text{Al}^{3+}/\text{Al}}$ is negative and $E^{\circ}_{\text{Tl}^{3+}/\text{Tl}}$ is positive. Statement II: The sum of first three ionization enthalpies of boron is very high when compared to that of aluminium. Due to this reason boron forms covalent compounds only and aluminium forms $\text{Al}^{3+}$ ion. In the light of the above statements, choose the correct answer from the options given below

Consider the elements $\mathrm{N}, \mathrm{P}, \mathrm{O}, \mathrm{S}, \mathrm{Cl}$ and F. The number of valence electrons present in the elements with most and least metallic character from the above list is respectively.

Given below are two statements: Statement I: The second ionisation enthalpy of Na is larger than the corresponding ionisation enthalpy of Mg. Statement II: The ionic radius of $\mathrm{O}^{2-}$ is larger than that of $\mathrm{F}^{-}$. In the light of the above statements, choose the correct answer from the options given below