Inorganic Chemistry PYQ — Page 4

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 $\_\_\_\_$.

Which of the following are true about the energy of the given d-orbitals of a tetrahedral complex? A. $d_{xy} = d_{xz} > d_{x^2-y^2}$ B. $d_{xy} = d_{yz} > d_{z^2}$ C. $d_{x^2-y^2} > d_{z^2} > d_{xz}$ D. $d_{x^2-y^2} = d_{z^2} < d_{xz}$ Choose the correct answer from the given below:

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 :

Pair of species among the following having same bond order as well as paramagnetic character will be-

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 $\mathrm{g} \mathrm{mol}^{-1}: \mathrm{O}=16, \mathrm{Mg}=24, \mathrm{P}=31$)

Which of the following is NOT a physical or chemical characteristics of interstitial compounds?

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 $\_\_\_\_$.

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 :

An excess of AgNO$_3$ is added to $100$ mL of a $0.05$ M solution of tetraaquadichloridochromium (III) chloride. The number of moles of AgCl precipitated will be __________ $\times 10^{-3}$. (Nearest integer)

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

The number of isoelectronic species among $\mathrm{Sc}^{3+}, \mathrm{Cr}^{2+}, \mathrm{Mn}^{3+}, \mathrm{Co}^{3+}$ and $\mathrm{Fe}^{3+}$ is ' $\mathrm{n}^{\prime}$. If ' $\mathrm{n}^{\prime}$ moles of AgCl is formed during the reaction of complex with formula $\mathrm{CoCl}_{3}(\mathrm{en})_{2} \mathrm{NH}_{3}$ with excess of $\mathrm{AgNO}_{3}$ solution, then the number of electrons present in the $t_{2 g}$ orbital of the complex is $\_\_\_\_$.

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:

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 :

The correct statement among the following is:

The wavelength of light absorbed for the following complexes are in the order \(\underset{\text{(I)}}{\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}} ;\underset{\text{(II)}}{\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}} ;\underset{\text{(III)}}{\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}} ;\underset{\text{(IV)}}{\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{H}_2 \mathrm{O}\right)\right]^{3+}} ;\underset{\text{(V)}}{\left[\mathrm{CoF}_6\right]^{3-}}\)

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 :