Inorganic Chemistry PYQ — Page 15

Number of molecules/species from the following having one unpaired electron is \(\qquad\) \(\mathrm{O}_2, \mathrm{O}_2^{-1}, \mathrm{NO}, \mathrm{CN}^{-1}, \mathrm{O}_2^{2-}\)

Iron (III) catalyses the reaction between iodide and persulphate ions, in which A. \(\mathrm{Fe}^{3+}\) oxidises the iodide ion B. \(\mathrm{Fe}^{3+}\) oxidises the persulphate ion C. \(\mathrm{Fe}^{2+}\) reduces the iodide ion D. \(\mathrm{Fe}^{2+}\) reduces the persulphate ion Choose the most appropriate answer from the options given below:

Identify the incorrect statements about group 15 elements : (A) Dinitrogen is a diatomic gas which acts like an inert gas at room temperature. (B) The common oxidation states of these elements are \(-3,+3\) and +5 . (C) Nitrogen has unique ability to form \(\mathrm{p} \pi-\mathrm{p} \pi\) multiple bonds. (D) The stability of +5 oxidation states increases down the group. (E) Nitrogen shows a maximum covalency of 6. Choose the correct answer from the options given below :

The correct statements from the following are : (A) The decreasing order of atomic radii of group 13 elements is \(\mathrm{Tl}>\) In \(>\mathrm{Ga}>\mathrm{Al}>\mathrm{B}\). (B) Down the group 13 electronegativity decreases from top to bottom. (C) \(\mathrm{Al}\) dissolves in dil. \(\mathrm{HCl}\) and liberates \(\mathrm{H}_2\) but conc. \(\mathrm{HNO}_3\) renders \(\mathrm{Al}\) passive by forming a protective oxide layer on the surface. (D) All elements of group 13 exhibits highly stable +1 oxidation state. (E) Hybridisation of \(\mathrm{Al}\) in \(\left[\mathrm{Al}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}\) ion is \(\mathrm{sp}^3 \mathrm{~d}^2\). Choose the correct answer from the options given below :

Given below are two statements: Statement (I) : In the Lanthanoids, the formation of ${\mathrm{Ce}}^{+4}$ is favoured by its noble gas configuration. Statement (II) : ${\mathrm{Ce}}^{+4}$ is a strong oxidant reverting to the common $+3$ state. In the light of the above statements, choose the most appropriate answer from the options given below:

Given below are two statements: Statement I: Fluorine has most negative electron gain enthalpy in its group. Statement II: Oxygen has least negative electron gain enthalpy in its group. In the light of the above statements, choose the most appropriate from the options given below.

Which one of the following complexes will exhibit the least paramagnetic behaviour? [Atomic number, \(\mathrm{Cr}=24, \mathrm{Mn}=25, \mathrm{Fe}=26, \mathrm{Co}=27\) ]

Given below are two statements : Statement (I) : Dimethyl glyoxime forms a six membered covalent chelate when treated with ${\mathrm{NiCl}}_{2}$ solution in presence of ${\mathrm{NH}}_{4}\mathrm{OH}.$ Statement (II) : Prussian blue precipitate contains iron both in $(+2)$ and $(+3)$ oxidation states. In the light of the above statements, choose the most appropriate answer from the options given below:

The fusion of chromite ore with sodium carbonate in the presence of air leads to the formation of products \(\mathrm{A}\) and \(\mathrm{B}\) along with the evolution of \(\mathrm{CO}_2\). The sum of spin-only magnetic moment values of \(A\) and \(B\) is ______ B.M. (Nearest integer) [Given atomic number : \(\mathrm{C}: 6, \mathrm{Na}: 11, \mathrm{O}: 8, \mathrm{Fe}: 26, \mathrm{Cr}: 24\)]

Given below are two statements : Statement (I) : Fusion of \(\mathrm{MnO}_2\) with \(\mathrm{KOH}\) and an oxidising agent gives dark green \(\mathrm{K}_2 \mathrm{MnO}_4\). Statement (II) : Manganate ion on electrolytic oxidation in alkaline medium gives permanganate ion. In the light of the above statements, choose the correct answer from the options given below :

The number of species from the following which are paramagnetic and with bond order equal to one is ${H}_{2},{\mathrm{He}}_{2}^{+},{O}_{2}^{+},{N}_{2}^{2-},{O}_{2}^{2-},{F}_{2},{\mathrm{Ne}}_{2}^{+},{B}_{2}$

Which of the following material is not a semiconductor.

Match List - I with List - II. \(\begin{array}{ll} \text{List - I} & \text{List - II} \\ \text{Reaction} & \text{Type of redox reaction} \\ \text{(A) } \mathrm{TiCl}_4 & \text{(I) } \mathrm{e}^2, \mathrm{t}_2^0 \\ \text{(B) } \left[\mathrm{FeO}_4\right]^{2-} & \text{(II) } e^4, t_2^3 \\ \text{(C) } \left[\mathrm{FeCl}_4\right]^{-} & \text{(III) } e^0, t_2^0 \\ \text{(D) } \left[\mathrm{CoCl}_4\right]^{2-} & \text{(IV) } \mathrm{e}^2, \mathrm{t}_2^3 \end{array}\) Choose the correct answer from the options given below :

Given below are two statements : Statement (I) : A $\pi$ bonding $\mathrm{MO}$ has lower electron density above and below the inter-nuclear axis. Statement (II) : The ${\pi }^{*}$ antibonding $\mathrm{MO}$ has a node between the nuclei. In light of the above statements, choose the most appropriate answer from the options given below:

When \(\psi_{\mathrm{A}}\) and \(\psi_{\mathrm{B}}\) are the wave functions of atomic orbitals, then \(\sigma^*\) is represented by :

Yellow compound of lead chromate gets dissolved on treatment with hot $\mathrm{NaOH}$ solution. The product of lead formed is a :

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R).$ Assertion $(A):$ ${\mathrm{PH}}_{3}$ has lower boiling point than ${\mathrm{NH}}_{3}.$ Reason $(R):$ In liquid state ${\mathrm{NH}}_{3}$ molecules are associated through Vander Waal's forces, but ${\mathrm{PH}}_{3}$ molecules are associated through hydrogen bonding. In the light of the above statements, choose the most appropriate answer from the options given below:

Identity the incorrect pair from the following:

Match List I with List II \(\begin{array}{|l|l|c|l|} \hline & \text{List - I} & & \text{List - II} \\ \hline & \text{(Elements)} & & \text{(Properties in their respective groups)} \\ \hline \text { A. } & \mathrm{Cl}, \mathrm{S} & \text { I. } & \text { Elements with highest electronegativity } \\ \hline \text { B. } & \mathrm{Ge}, \mathrm{As} & \text { II. } & \text { Elements with largest atomic size } \\ \hline \text { C. } & \text { Fr, Ra } & \text { III. } & \begin{array}{l} \text { Elements which show properties of both } \\ \text { metals and non-metal } \end{array} \\ \hline \text { D. } & \text { F, O } & \text { IV. } & \begin{array}{l} \text { Elements with highest negative electron } \\ \text { gain enthalpy } \end{array} \\ \hline \end{array}\) Choose the correct answer from the options given below:

Match List I with List II \(\begin{array}{|l|l|l|l|} \hline & \text{List - I} & & \text{List - II} \\ & \text{(Hybridization)} & & \text{(Orientation in Space)} \\ \hline \text { A. } & \mathrm{sp}^3 & \text { I. } & \text { Trigonal bipyramidal } \\ \hline \text { B. } & \mathrm{dsp}^2 & \text { II. } & \text { Octahedral } \\ \hline \text { C. } & \mathrm{sp}^3 \mathrm{~d} & \text { III. } & \text { Tetrahedral } \\ \hline \text { D. } & \mathrm{sp}^3 \mathrm{~d}^2 & \text { IV. } & \text { Square planar } \\ \hline \end{array}\) Choose the correct answer from the options given below:

An octahedral complex with the formula \(\mathrm{CoCl}_3 \cdot \mathrm{nNH}_3\) upon reaction with excess of \(\mathrm{AgNO}_3\) solution gives 2 moles of \(\mathrm{AgCl}\). Consider the oxidation state of \(\mathrm{Co}\) in the complex is ' \(x\) '. The value of " \(x+n\) " is ______

Choose the correct statements about the hydrides of group $15$ elements. A. The stability of the hydrides decreases in the order ${\mathrm{NH}}_{3}>{\mathrm{PH}}_{3}>{\mathrm{AsH}}_{3}>{\mathrm{SbH}}_{3}>{\mathrm{BiH}}_{3}$ B. The reducing ability of the hydrides increases in the order ${\mathrm{NH}}_{3}<{\mathrm{PH}}_{3}<{\mathrm{AsH}}_{3}<{\mathrm{SbH}}_{3}<{\mathrm{BiH}}_{3}$ C. Among the hydrides, ${\mathrm{NH}}_{3}$ is strong reducing agent while ${\mathrm{BiH}}_{3}$ is mild reducing agent. D. The basicity of the hydrides increases in the order ${\mathrm{NH}}_{3}<{\mathrm{PH}}_{3}<{\mathrm{AsH}}_{3}<{\mathrm{SbH}}_{3}<{\mathrm{BiH}}_{3}$ Choose the most appropriate from the option given below:

Match List I with List II \(\begin{array}{|l|l|l|l|} \hline & \text{List-I} & & \text{List-II} \\ \hline & \text{(Molecule)} & & \text{(Shape)} \\ \hline \text { A. } & \mathrm{NH}_3 & \text { I. } & \text { Square pyramid } \\ \hline \text { B. } & \mathrm{BrF}_5 & \text { II. } & \text { Tetrahedral } \\ \hline \text { C. } & \mathrm{PCl}_5 & \text { III. } & \text { Trigonal pyramidal } \\ \hline \text { D. } & \mathrm{CH}_4 & \text { IV. } & \text { Trigonal bipyramidal } \\ \hline \end{array}\) Choose the correct answer from the options given below:

Consider the following complex ions $P=[{\mathrm{FeF}}_{6}{]}^{3–}$, $Q=[V({H}_{2}O){}_{6}{]}^{2+}$, $R=[\mathrm{Fe}({H}_{2}O{)}_{6}{]}^{2+}$ The correct order of the complex ions, according to their spin only magnetic moment values (in B.M.) is :