Inorganic Chemistry PYQ — Page 3

Consider the transition metal ions $\mathrm{Mn}^{3+}, \mathrm{Cr}^{3+}, \mathrm{Fe}^{3+}$ and $\mathrm{Co}^{3+}$ and all form low spin octahedral complexes. The correct decreasing order of unpaired electrons in their respective d-orbitals of the complexes is

The crystal field splitting energy of $\left[\mathrm{Co}(\text { oxalate })_{3}\right]^{3-}$ complex is ' $\mathrm{n}^{\prime}$ times that of the $\left[\mathrm{Cr}(\text { oxalate })_{3}\right]^{3-}$ complex. Here ' $\mathrm{n}^{\prime}$ is $\_\_\_\_$. (Assume $\Delta_{0} \gg \mathrm{P}$)

Given below are some of the statements about Mn and $\mathrm{Mn}_{2} \mathrm{O}_{7}$. Identify the correct statements. A. Mn forms the oxide $\mathrm{Mn}_{2} \mathrm{O}_{7}$, in which Mn is in its highest oxidation state. B. Oxygen stabilizes the Mn in higher oxidation states by forming multiple bonds with Mn. C. $\mathrm{Mn}_{2} \mathrm{O}_{7}$ is an ionic oxide. D. The structure of $\mathrm{Mn}_{2} \mathrm{O}_{7}$ consists of one bridged oxygen. Choose the correct answer from the options given below :

X is the number of geometrical isomers exhibited by $\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)\left(\mathrm{H}_{2} \mathrm{O}\right) \mathrm{BrCl}\right]$. Y is the number of optically inactive isomer(s) exhibited by $\left[\mathrm{CrCl}_{2}(\mathrm{ox})_{2}\right]^{3-}$ Z is the number of geometrical isomers exhibited by $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{3}\left(\mathrm{NO}_{2}\right)_{3}\right]$. The value of $\mathrm{X}+\mathrm{Y}+\mathrm{Z}$ is $\_\_\_\_$.

Consider the following reactions: $\mathrm{NaCl}+\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{~A}+\mathrm{KHSO}_{4}+\mathrm{NaHSO}_{4}+\mathrm{H}_{2} \mathrm{O}$ $\mathrm{A}+\mathrm{NaOH} \rightarrow \mathrm{B}+\mathrm{NaCl}+\mathrm{H}_{2} \mathrm{O}$ $\mathrm{B}+\mathrm{H}_{2} \mathrm{SO}_{4}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow \mathrm{C}+\mathrm{Na}_{2} \mathrm{SO}_{4}+\mathrm{H}_{2} \mathrm{O}$ In the product ' $C$ ', ' $X$ ' is the number of $O_{2}^{2-}$ units, ' $Y$ ' is the total number oxygen atoms present and ' $Z$ ' is the oxidation state of $C r$. The value of $X+Y+Z$ is $\_\_\_\_$.

Correct statements from the following are A. Potassium dichromate is an oxidising agent and it oxidises $FeSO_4$ to $Fe_2(SO_4)_3$ in acidic medium. B. Sodium dichromate can be used as primary standard in volumetric estimation. C. $CrO_4^{2-}$ and $Cr_2O_7^{2-}$ are interconvertible in aqueous solution by varying the $pH$ of the solution. D. $Cr$-$O$-$Cr$ bond angle in $Cr_2O_7^{2-}$ is $126^\circ$. Choose the correct answer from the options given below:

The correct trend in the first ionization enthalpies of the elements in the $3^{\text {rd }}$ period of periodic table is :

The $1^{st}$ ionization enthalpy for Mg is $+737$ kJ/mol. The most probable estimated value of the $2^{nd}$ ionization enthalpy of Mg is ______.

By usual analysis, 1.00 g of compound $(\mathrm{X})$ gave 1.79 g of magnesium pyrophosphate. The percentage of phosphorus in compound $(X)$ is : (nearest integer) (Given, molar mass in $\mathrm{g} \mathrm{mol}^{-1}: \mathrm{O}=16, \mathrm{Mg}=24, \mathrm{P}=31$)

Given below are two statements: Statement I: The halogen that makes longest bond with hydrogen in HX, has the smallest covalent radius in its group. Statement II: A group 15 element's hydride $\mathrm{EH}_{3}$ has the lowest boiling point among corresponding hydrides of other group 15 elements. The maximum covalency of that element E is 4. In the light of the above statements, choose the correct answer from the options given below

$\mathrm{MnO}_{4}{ }^{2-}$, in acidic medium, disproportionates to :

Given below are two statements: Statement I: $\mathrm{K}>\mathrm{Mg}>\mathrm{Al}>\mathrm{B}$ is the correct order in terms of metallic character. Statement II: Atomic radius is always greater than the ionic radius for any element. In the light of the above statements, choose the correct answer from the options given below

The pairs among $A = [\text{SO}_3^{2-}, \text{CO}_3^{2-}]$, $B = [\text{O}_2^{2-}, \text{F}_2]$, $C = [\text{CN}^-, \text{CO}]$, $D = [\text{NH}_3, \text{H}_3\text{O}^+]$ and $E = [\text{MnO}_4^{2-}, \text{CrO}_4^{2-}]$ that do not have similar Lewis dot structure are

Total number of unpaired electrons present in the central metal atoms/ions of $\left[\mathrm{Ni}(\mathrm{CO})_{4}\right],\left[\mathrm{NiCl}_{4}\right]^{2-},\left[\mathrm{PtCl}_{2}\left(\mathrm{NH}_{3}\right)_{2}\right],\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}$ and $\left[\mathrm{Pt}(\mathrm{CN})_{4}\right]^{2-}$ is $\_\_\_\_$.

Find the correct statements related to group 15 hydrides. A. Reducing nature increases from NH$_3$ to BiH$_3$ B. Tendency to donate lone pair of electrons decreases from NH$_3$ to BiH$_3$ C. The stability of hydrides decreases from NH$_3$ to BiH$_3$ D. HEH bond angle decreases from NH$_3$ to SbH$_3$ (E = Elements of group 15) Choose the correct answer from the options given below:

Consider $|x|$ is the difference in oxidation states of Mn in highest manganese fluoride and highest manganese oxide. The ions with $|x|$ number of unpaired electrons from the following are: A. $Sc^{3+}$ B. $Zn^{2+}$ C. $V^{2+}$ D. $Fe^{2+}$ E. $Co^{2+}$ Choose the correct answer from the options given below:

Given below are two statements : Statement (I) : The first ionisation enthalpy of the elements Na, Mg, Cl and Ar follows the order Na $>$ Mg $>$ Cl $>$ Ar. Statement (II) : Among Ca, Al, Fe and B, the third ionisation enthalpy is very high for Ca. In the light of the above statements, choose the correct answer from the options given below :

Which of the following sequences of hybridisation, geometry and magnetic nature are correct for the given coordination compounds ? A. $[\text{NiCl}_4]^{2-}$ $-$ sp$^3$, tetrahedral, paramagnetic B. $[\text{Ni(NH}_3)_6]^{2+}$ $-$ sp$^3$d$^2$, octahedral, paramagnetic C. $[\text{Ni(CO)}_4]$ $-$ sp$^3$, tetrahedral, paramagnetic D. $[\text{Ni(CN)}_4]^{2-}$ $-$ dsp$^2$, square planar, diamagnetic Choose the correct answer from the options given below :

Given below are two statements: Statement I: Each electron in $e_g$ orbitals destabilizes the orbitals by $+0.6\Delta_o$ and each electron in the $t_{2g}$ orbitals stabilizes the orbitals by $-0.4\Delta_o$ in an octahedral field on the basis of crystal field theory. Statement II: All the d-orbitals of the transition metals have the same energy in their free atomic state but when a complex is formed the ligands destroy the degeneracy of these orbitals on the basis of crystal field theory. In the light of the above statements, choose the correct answer from the options given below

Match List - I with List - II. <table class="pyq-table"><tbody><tr><th>List - I Chromium (III) Complexes (en = ethylene diamine)</th><th>List - II $\Delta_0$ (cm$^{-1}$)</th></tr><tr><td>A. $[Cr(CN)_6]^{3-}$</td><td>I. $15,060$</td></tr><tr><td>B. $[CrF_6]^{3-}$</td><td>II. $17,400$</td></tr><tr><td>C. $[Cr(H_2O)_6]^{3+}$</td><td>III. $22,300$</td></tr><tr><td>D. $[Cr(en)_3]^{3+}$</td><td>IV. $26,600$</td></tr></tbody></table> Choose the correct answer from the options given below :

Which of the following complexes will show coordination isomerism? A. $[Ag(NH_3)_2][Ag(CN)_2]$ B. $[Co(NH_3)_6][Cr(CN)_6]$ C. $[Co(NH_3)_6][Co(CN)_6]$ D. $[Fe(NH_3)_6][Co(CN)_6]$ E. $[Co(NH_3)_6][Fe(CN)_6]$ Choose the correct answer from the options given below:

The correct statement among the following is:

The correct increasing order of spin-only magnetic moment values of the complex ions $\left[\mathrm{MnBr}_{4}\right]^{2-}(\mathrm{A}),\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}(\mathrm{B}),\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}(\mathrm{C})$ and $\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}(\mathrm{D})$ is :

Among $Fe^{2+}, Fe^{3+}, Cr^{2+}$ and $Zn^{2+}$, the ion that shows positive borax bead test and with highest ionisation enthalpy is: