JEE Main Chemistry — Inorganic Chemistry previous year questions with solutions.
The metal that shows highest and maximum number of oxidation state is :
Number of molecules from the following which are exceptions to octet rule is ______ \(\mathrm{CO}_2, \mathrm{NO}_2, \mathrm{H}_2 \mathrm{SO}_4, \mathrm{BF}_3, \mathrm{CH}_4, \mathrm{SiF}_4, \mathrm{ClO}_2, \mathrm{PCl}_5, \mathrm{BeF}_2, \mathrm{C}_2 \mathrm{H}_6, \mathrm{CHCl}_3, \mathrm{CBr}_4\)
Given below are two statements : one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R).$ Assertion $(A)$ : In aqueous solutions ${\mathrm{Cr}}^{2+}$ is reducing while ${\mathrm{Mn}}^{3+}$ is oxidising in nature. Reason $(R):$ Extra stability to half filled electronic configuration is observed than incompletely filled electronic configuration. In the light of the above statement, choose the most appropriate answer from the options given below:
Match List I with List II \(\begin{array}{|l|l|l|l|} \hline & \text{List - I} & & \text{List - II} \\ & \text{(Compound)} & & \text{(Uses)} \\ \hline \text { A. } & \text { Iodoform } & \text { I. } & \text { Fire extinguisher } \\ \hline \text { B. } & \text { Carbon tetrachloride } & \text { II. } & \text { Insecticide } \\ \hline \text { C. } & \text { CFC } & \text { III. } & \text { Antiseptic } \\ \hline \text { D. } & \text { DDT } & \text { IV. } & \text { Refrigerants } \\ \hline \end{array}\) Choose the correct answer from the options given below:
In chromyl chloride test for confirmation of ${\mathrm{Cl}}^{–}$ ion, a yellow solution is obtained. Acidification of the solution and addition of amyl alcohol and $10%{H}_{2}{O}_{2}$turns organic layer blue indicating formation of chromium pentoxide. The oxidation state of chromium in that is
Consider the following reaction \(\mathrm{MnO}_2+\mathrm{KOH}+\mathrm{O}_2 \rightarrow \mathrm{A}+\mathrm{H}_2 \mathrm{O}\). Product ' \(\mathrm{A}\) ' in neutral or acidic medium disproportionate to give products ' \(\mathrm{B}\) ' and ' \(\mathrm{C}\) ' along with water. The sum of spin-only magnetic moment values of \(\mathrm{B}\) and \(\mathrm{C}\) is \(\qquad\) BM. (nearest integer) (Given atomic number of \(\mathrm{Mn}\) is 25)
Match List I with List II \(\begin{array}{|l|l|l|l|} \hline & \text{List - I} & & \text{List - II} \\ & \text{(Precipitating reagent and conditions)} & & \text{(Cation)} \\ \hline \text { A. } & \mathrm{NH}_4 \mathrm{Cl}+\mathrm{NH}_4 \mathrm{OH} / \mathrm{ARKS} & \text { I. } & \mathrm{Mn}^{2+} \\ \hline \text { B. } & \mathrm{NH}_4 \mathrm{OH}+\mathrm{Na}_2 \mathrm{CO}_3 & \text { II. } & \mathrm{Pb}^{2+} \\ \hline \text { C. } & \mathrm{NH}_4 \mathrm{OH}+\mathrm{NH}_4 \mathrm{Cl}+\mathrm{H}_2 \mathrm{~S} \text { gas } & \text { III. } & \mathrm{Al}^{3+} \\ \hline \text { D. } & \text { dilute } \mathrm{HCl} & \text { IV. } & \mathrm{Sr}^{2+} \\ \hline \end{array}\) Choose the correct answer from the options given below:
Match List I with List II \(\begin{array}{|l|l|l|l|} \hline & \text{ List - I } & & \text{List - II} \\ \hline \text { A. } & \mathrm{K}_2\left[\mathrm{Ni}(\mathrm{CN})_4\right] & \text { I. } & \mathrm{sp}^3 \\ \hline \text { B. } & {\left[\mathrm{Ni}(\mathrm{CO})_4\right]} & \text { II. } & \mathrm{sp}^3 \mathrm{~d}^2 \\ \hline \text { C. } & {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Cl}_3} & \text { III. } & \mathrm{dsp}^2 \\ \hline \text { D. } & \mathrm{Na}_3\left[\mathrm{CoF}_6\right] & \text { IV. } & \mathrm{d}^2 \mathrm{sp}^3 \\ \hline \end{array}\) Choose the correct answer from the options given below:
Match List I with List II \(\begin{array}{|l|l|l|l|} \hline & \text{List-I} & & \text{List-II} \\ \hline & \text{(Molecule)} & & \text{(Shape)} \\ \hline \text { A. } & \mathrm{Fe}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]_3 \cdot \mathrm{xH}_2 \mathrm{O} & \text { I. } & \text { Violet } \\ \hline \text { B. } & {\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NOS}^{4-}\right.} & \text { II. } & \text { Blood Red } A \\ \hline \text { C. } & {[\mathrm{Fe}(\mathrm{SCN})]^{2+}} & \text { III. } & \text { Prussian Blue } \\ \hline \text { D. } & \left(\mathrm{NH}_4\right)_3 \mathrm{PO}_4 \cdot 12 \mathrm{MoO}_3 & \text { IV. } & \text { Yellow } \\ \hline \end{array}\) Choose the correct answer from the options given below:
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Both rhombic and monoclinic sulphur exist as \(\mathrm{S}_8\) while oxygen exists as \(\mathrm{O}_2\). Reason (R) : Oxygen forms \(\mathrm{p} \pi-\mathrm{p} \pi\) multiple bonds with itself and other elements having small size and high electronegativity like \(\mathrm{C}, \mathrm{N}\), which is not possible for sulphur. In the light of the above statements, choose the most appropriate answer from the options given below :
Match List I with List II \(\begin{array}{|l|l|c|l|} \hline & \text{ List - I } & & \text{List - II} \\ \hline \text { A. } & \text { Melting Point }[\mathrm{K}] & \text { I. } & \mathrm{T} 1>\mathrm{In}>\mathrm{Ga}>\mathrm{A} 1>\mathrm{B} \\ \hline \text { B. } & \text { Ionic Radius }\left[\mathrm{M}^{+3} / \mathrm{pm}\right] & \text { II. } & \mathrm{B}>\mathrm{T} 1>\mathrm{A} 1 \approx \mathrm{Ga}>\mathrm{In} \\ \hline \text { C. } & \Delta_{\mathrm{i}} \mathrm{H}_1\left[\mathrm{~kJ} \mathrm{~mol}^{-1}\right] & \text { III. } & \mathrm{T} 1>\mathrm{In}>\mathrm{A} 1>\mathrm{Ga}>\mathrm{B} \\ \hline \text { D. } & \text { Atomic Radius }[\mathrm{pm}] & \text { IV. } & \mathrm{B}>\mathrm{A} 1>\mathrm{T} 1>\mathrm{In}>\mathrm{Ga} \\ \hline \end{array}\) Choose the correct answer from the options given below:
When \(\mathrm{MnO}_2\) and \(\mathrm{H}_2 \mathrm{SO}_4\) is added to a salt (A), the greenish yellow gas liberated as salt (A) is :
Give below are two statements: Statement I : The higher oxidation states are more stable down the group among transition elements unlike p-block elements. Statement II : Copper can not liberate hydrogen from weak acids. In the light of the above statements, choose the correct answer from the options given below :
Choose the correct Statements from the following: (A) $\mathrm{Ethane}-1,2-\mathrm{diamine}$ is a chelating ligand. (B) Metallic aluminium is produced by electrolysis of aluminium oxide in presence of cryolite. (C) Cyanide ion is used as ligand for leaching of silver. (D) Phosphine act as a ligand in Wilkinson catalyst. (E) The stability constants of ${\mathrm{Ca}}^{2+}$ and ${\mathrm{Mg}}^{2+}$ are similar with EDTA complexes. Choose the correct answer from the options given below:
Given below are two statements: Statement I: \(\mathrm{N}\left(\mathrm{CH}_3\right)_3\) and \(\mathrm{P}\left(\mathrm{CH}_3\right)_3\) can act as ligands to form transition metal complexes. Statement II: As N and P are from same group, the nature of bonding of \(\mathrm{N}\left(\mathrm{CH}_3\right)_3\) and \(\mathrm{P}\left(\mathrm{CH}_3\right)_3\) is always same with transition metals. In the light of the above statements, choose the most appropriate answer from the options given below:
The total number of molccules with zero dipole moment among ${\mathrm{CH}}_{4},{\mathrm{BF}}_{3},{H}_{2}O,\mathrm{HF},{\mathrm{NH}}_{3},{\mathrm{CO}}_{2}$ and ${\mathrm{SO}}_{2}$ is ______.
Molar mass of the salt from $\mathrm{NaBr},{\mathrm{NaNO}}_{3},\mathrm{KI}$ and ${\mathrm{CaF}}_{2}$ which does not evolve coloured vapours on heating with concentrated ${H}_{2}{\mathrm{SO}}_{4}$ is ____ $g{\mathrm{mol}}^{–1}$, (Molar mass in $g{\mathrm{mol}}^{–1}:\mathrm{Na}:23,N:14,K:39,O:16,\mathrm{Br}:80,I:127,F:19,\mathrm{Ca}:40$)
Number of complexes from the following with even number of unpaired " \(\mathrm{d}\) " electrons is \(\qquad\) \(\left[\mathrm{V}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+},\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+},\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+},\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+},\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}\) [Given atomic numbers : \(\mathrm{V}=23, \mathrm{Cr}=24, \mathrm{Fe}=26, \mathrm{Ni}=28 \mathrm{Cu}=29\)]
In the reaction of potassium dichromate, potassium chloride and sulfuric acid (conc.), the oxidation state of the chromium in the product is $(+)$ _______.
\(0.05 \mathrm{M} \mathrm{CuSO}_4\) when treated with \(0.01 \mathrm{M} \mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) gives green colour solution of \(\mathrm{Cu}_2 \mathrm{Cr}_2 \mathrm{O}_7\). The two solutions are separated as shown below : [SPM : Semi Permeable Membrane]  Due to osmosis :
Identify the correct statements about p-block elements and their compounds. (A) Non metals have higher electronegativity than metals. (B) Non metals have lower ionisation enthalpy than metals. (C) Compounds formed between highly reactive nonmetals and highly reactive metals are generally ionic. (D) The non-metal oxides are generally basic in nature. (E) The metal oxides are generally acidic or neutral in nature. Choose the correct answer from the options given below :
The total number of 'Sigma' and $\mathrm{Pi}$ bonds in 2-formylhex-4-enoic acid is
On reaction of Lead Sulphide with dilute nitric acid which of the following is not formed?
Number of complexes which show optical isomerism among the following is _________. $cis-{[\mathrm{Cr}(\mathrm{ox}{)}_{2}{\mathrm{Cl}}_{2}]}^{3-},{[\mathrm{Co}(\mathrm{en}{)}_{3}]}^{3+}$$\text{, cis }-{[\mathrm{Pt}(\mathrm{en}{)}_{2}{\mathrm{Cl}}_{2}]}^{2+}\text{, cis }-{[\mathrm{Co}(\mathrm{en}{)}_{2}{\mathrm{Cl}}_{2}]}^{+}$ $,trans-{[\mathrm{Pt}(\mathrm{en}{)}_{2}{\mathrm{Cl}}_{2}]}^{2+},\text{ trans }-{[\mathrm{Cr}(\mathrm{ox}{)}_{2}{\mathrm{Cl}}_{2}]}^{3-}$