Inorganic Chemistry PYQ — Page 5

Given below are two statements: Statement I: The covalency of oxygen is generally two but it can exceed upto four. The oxidation state of oxygen in $SO_2$ is $-2$ and in $OF_2$ it is $+2$. Statement II: The anomalous behaviour of oxygen when compared to the other elements of group $16$ is due to its small size and high electronegativity. In the light of the above statements, choose the correct answer from the options given below

Given below are two statements : Statement I: Aluminium upon reaction with NaOH forms $[Al(OH)_6]^{3-}$ ion. Statement II: The geometry of $ICl_4^-$, $ClO_3^-$ and $IBr_2^-$ is square planar, pyramidal and linear respectively. In the light of the above statements, choose the correct answer from the options given below :

Given below are two statements : Statement (I) : The correct sequence of bond lengths in the following species is : $O_2^+ < O_2 < O_2^- < O_2^{2-}$ Statement (II) : The correct sequence of number of unpaired electrons in the following species is : $O_2 > O_2^+ > O_2^- > O_2^{2-}$ In the light of the above statements, choose the correct answer from the options given below :

Match the LIST-I with LIST-II <table class="pyq-table"><tbody><tr><th>List-I Electronic configuration of tetrahedral metal ion</th><th>List-II Crystal Field Stabilization Energy ($\Delta_t$)</th></tr><tr><td>A. $d^2$</td><td>I. $-0.6$</td></tr><tr><td>B. $d^4$</td><td>II. $-0.8$</td></tr><tr><td>C. $d^6$</td><td>III. $-1.2$</td></tr><tr><td>D. $d^8$</td><td>IV. $-0.4$</td></tr></tbody></table> Choose the correct answer from the options given below:

A first row transition metal $(\mathrm{M})$ does not liberate $\mathrm{H}_{2}$ gas from dilute HCl.1 mol of aqueous solution of $\mathrm{MSO}_{4}$ is treated with excess of aqueous KCN and then $\mathrm{H}_{2} \mathrm{~S}(\mathrm{~g})$ is passed through the solution. The amount of MS (metal sulphide) formed from the above reaction is $\_\_\_\_$ mol.

Consider the following reactions $\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \xrightarrow{\Delta} 2 \mathrm{X}+\mathrm{Y}$ $\mathrm{CuSO}_{4}+\mathrm{Y} \xrightarrow{\text { Non-Luminous flame }} \mathrm{Z}+\mathrm{SO}_{3}$ $2 \mathrm{Z}+2 \mathrm{X}+$ Carbon $\xrightarrow{\text { Luminous flame }} 2 \mathrm{Q}+\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7}+\mathrm{CO}$ The oxidation states of Cu in Z and Q, respectively are :

Given below are two statements : Statement I: The number of pairs among $[Al_2O_3, Cr_2O_3]$, $[Cl_2O_7, Mn_2O_7]$, $[Na_2O, V_2O_3]$ and $[CO, N_2O]$ that contain oxides of same nature (acidic, basic, neutral or amphoteric) is $4$. Statement II: Among $Na_2O$, $Al_2O_3$, $CO$ and $Cl_2O_7$, the most basic and acidic oxides are $Na_2O$ and $Cl_2O_7$, respectively. In the light of the above statements, choose the correct answer from the options given below :

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.

Among $\mathrm{H}_{2} \mathrm{~S}, \mathrm{H}_{2} \mathrm{O}, \mathrm{NF}_{3}, \mathrm{NH}_{3}$ and $\mathrm{CHCl}_{3}$, identify the molecule $(\mathrm{X})$ with lowest dipole moment value. The number of lone pairs of electrons present on the central atom of the molecule $(X)$ is :

A ' p '-block element $(\mathrm{E})$ and hydrogen form a binary cation $\left(\mathrm{EH}_{\mathrm{x}}\right)^{+}$, while $\mathrm{EH}_{3}$ on treatment with $\mathrm{K}_{2} \mathrm{HgI}_{4}$ in alkaline medium gives a precipitate of basic mercury(II)amido-iodine. Given below are first ionisation enthalpy values $\left(\mathrm{kJ} \mathrm{mol}^{-1}\right)$ for first element each from group 13, 14, 15 and 16. Identify the correct first ionisation enthalpy value for element E.

Among the following, the CORRECT combinations are A. $\mathrm{IF}_{3} \rightarrow \mathrm{~T}$-shaped (sp$\left.{ }^{3} \mathrm{~d}\right)$ B. $\mathrm{IF}_{5} \rightarrow$ Square pyramidal $\left(\mathrm{sp}^{3} \mathrm{~d}^{2}\right)$ C. $\mathrm{IF}_{7} \rightarrow$ Pentagonal bipyramidal $\left(\mathrm{sp}^{3} \mathrm{~d}^{3}\right)$ D. $\mathrm{ClO}_{4}{ }^{-} \rightarrow$ Square planar $\left(\mathrm{sp}^{2} \mathrm{~d}\right)$ Choose the correct answer from the options given below:

Given below are two statements : Statement I : The number of species among $\mathrm{SF}_{4}, \mathrm{NH}_{4}^{+},\left[\mathrm{NiCl}_{4}\right]^{2-}, \mathrm{XeF}_{4},\left[\mathrm{PtCl}_{4}\right]^{2-}, \mathrm{SeF}_{4}$ and $\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}$, that have tetrahedral geometry is 3. Statement II : In the set [$\mathrm{NO}_{2}, \mathrm{BeH}_{2}, \mathrm{BF}_{3}, \mathrm{AlCl}_{3}$], all the molecules have incomplete octet around central atom. In the light of the above statements, choose the correct answer from the options given below :

The correct set that contains all kinds (basic, acidic, amphoteric and neutral) of oxides is:

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

" 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

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 :

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.

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 $\_\_\_\_$.

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:

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

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

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 correct order of first $(\Delta_i H_1)$ and second $(\Delta_i H_2)$ ionisation enthalpy values of Cr and Mn are : A. $\Delta_i H_1 :$ Cr $>$ Mn B. $\Delta_i H_2 :$ Cr $>$ Mn C. $\Delta_i H_1 :$ Mn $>$ Cr D. $\Delta_i H_2 :$ Mn $>$ Cr Choose the correct answer from the options given below :

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 :