JEE Main Chemistry — Inorganic Chemistry previous year questions with solutions.
Given below are two statements : Statement I : In group 13, the stability of +1 oxidation state increases down the group. Statement II : The atomic size of gallium is greater than that of aluminium. In the light of the above statements, choose the most appropriate answer from the options given below :
The Lassiagne's extract is boiled with dil ${\mathrm{HNO}}_{3}$ before testing for halogens because,
Given below are the two statements: one is labeled as Assertion (A) and the other is labeled as Reason (R). Assertion (A): There is a considerable increase in covalent radius from $N$ to $P$. However from $As$ to $Bi$ only a small increase in covalent radius is observed. Reason (R): covalent and ionic radii in a particular oxidation state increases down the group. In the light of the above statement, choose the most appropriate answer from the options given below:
Number of moles of ${H}^{+}$ ions required by $1$ mole of ${\mathrm{MnO}}_{4}^{-}$ to oxidise oxalate ion to ${\mathrm{CO}}_{2}$ is ______.
Number of elements from the following that CANNOT form compounds with valencies which match with their respective group valencies is ______. B, C, N, S, O, F, P, Al, Si
Given below are two statements: Statement-I: The gas liberated on warming a salt with dil ${H}_{2}{\mathrm{SO}}_{4}$, turns a piece of paper dipped in lead acetate into black, it is a confirmatory test for sulphide ion. Statement-II: In statement-I the colour of paper turns black because of formation of lead sulphite. In the light of the above statements, choose the most appropriate answer from the options given below:
The correct order of the first ionization enthalpy is
Number of compounds with one lone pair of electrons on central atom amongst following is _ ${O}_{3},{H}_{2}O,{\mathrm{SF}}_{4},{\mathrm{ClF}}_{3},{\mathrm{NH}}_{3},{\mathrm{BrF}}_{5},{\mathrm{XeF}}_{4}$
The molecule/ion with square pyramidal shape is:
The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is _____. \(\mathrm{Ti}^{2+}, \mathrm{Cr}^{2+}\) and \(\mathrm{V}^{2+}\)
Which of the following statements are correct about $\mathrm{Zn},\mathrm{Cd}$ and $\mathrm{Hg}$ ? A. They exhibit high enthalpy of atomization as the d-subshell is full. B. $\mathrm{Zn}$ and $\mathrm{Cd}$ do not show variable oxidation state while $\mathrm{Hg}$ shows $+I$ and $+\mathrm{II}$. C. Compounds of $\mathrm{Zn},\mathrm{Cd}$ and $\mathrm{Hg}$ are paramagnetic in nature. D. $\mathrm{Zn},\mathrm{Cd}$ and $\mathrm{Hg}$ are called soft metals. Choose the most appropriate from the options given below:
Match List - I with List - II. \(\begin{array}{lll} \begin{array}{l} \text { List - I } \\ \text { (Complex ion) } \end{array} & \begin{array}{l} \text { List - II } \\ \text { (Spin only magnetic moment in B.M.) } \end{array} \\ \text { (A) }\left[\mathrm{Cr}\left(\mathrm{NH}_3\right)_6\right]^{3+} & \text { (I) } 4.90 \\ \text { (B) }\left[\mathrm{NiCl}_4\right]^{2-} & \text { (II) } 3.87 \\ \text { (C) }\left[\mathrm{CoF}_6\right]^{3-} & \text { (III) } 0.0 \\ \text { (D) }\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-} & \text { (IV) } 2.83 \end{array}\) 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) : \(\mathrm{NH}_3\) and \(\mathrm{NF}_3\) molecule have pyramidal shape with a lone pair of electrons on nitrogen atom. The resultant dipole moment of \(\mathrm{NH}_3\) is greater than that of \(\mathrm{NF}_3\). Reason (R) : In \(\mathrm{NH}_3\), the orbital dipole due to lone pair is in the same direction as the resultant dipole moment of the \(\mathrm{N}-\mathrm{H}\) bonds. \(\mathrm{F}\) is the most electronegative element. In the light of the above statements, choose the correct answer from the options given below :
Match List I with List II \(\begin{array}{|l|l|l|l|} \hline & \text{List-I} & & \text{List-II} \\ \hline & \text{(Name of the test)} & & \text{(Reaction sequence involved) [M is metal]} \\ \hline \text { A. } & \text { Borax bead test } & \text { I. } & \mathrm{MCO}_3 \rightarrow \mathrm{MO} \xrightarrow{\mathrm{Co}\left(\mathrm{NO}_3\right)_2} \mathrm{CoO} \cdot \mathrm{MO} \\ \hline \text { B. } & \begin{array}{l} \text { Charcoal } \\ \text { cavity test } \end{array} & \text { II. } & \mathrm{MCO}_3 \rightarrow \mathrm{MCl}_2 \rightarrow \mathrm{M}^{2+} \\ \hline \text { C } & \begin{array}{l} \text { Cobalt nitrate } \\ \text { test } \end{array} & \text { III } & \mathrm{MSO}_4 \xrightarrow[\Delta]{\mathrm{Na}_2 \mathrm{~B}_4 \mathrm{O}_7} \mathrm{M}\left(\mathrm{BO}_2\right)_2 \rightarrow \mathrm{MBO}_2 \rightarrow \mathrm{M} \\ \hline \text { D. } & \text { Flame test } & \text { IV } & \mathrm{MSO}_4 \xrightarrow[\Delta]{\mathrm{Na}_2 \mathrm{CO}_3} \mathrm{MCO}_3 \rightarrow \mathrm{MO} \rightarrow \mathrm{M} \\ \hline \end{array}\) Choose the correct answer from the options given below:
Diamagnetic Lanthanoid ions are:
Given below are two statements : Statement (I) : The oxidation state of an element in a particular compound is the charge acquired by its atom on the basis of electron gain enthalpy consideration from other atoms in the molecule. Statement (II) : \(\mathrm{p} \pi-\mathrm{p} \pi\) bond formation is more prevalent in second period elements over other periods. In the light of the above statements, choose the most appropriate answer from the options given below :
The number of neutrons present in the more abundant isotope of boron is ' \(x\) '. Amorphous boron upon heating with air forms a product, in which the oxidation state of boron is ' \(y\) '. The value of \(x+y\) is _______
Number of compounds / species from the following with non-zero dipole moment is ______ \(\mathrm{BeCl}_2, \mathrm{BCl}_3, \mathrm{NF}_3, \mathrm{XeF}_4, \mathrm{CCl}_4, \mathrm{H}_2 \mathrm{O}, \mathrm{H}_2 \mathrm{~S}, \mathrm{HBr}, \mathrm{CO}_2, \mathrm{H}_2, \mathrm{HCl}\)
The \(\mathrm{F}^{-}\)ions make the enamel on teeth much harder by converting hydroxyapatite (the enamel on the surface of teeth) into much harder fluoroapatite having the formula.
he following complexes \(\underset{\large \text{(A)}}{\left[\mathrm{CoCl}\left(\mathrm{NH}_3\right)_5\right]^{2+}},\underset{\large \text{(B)}}{\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}},\underset{\large \text{(C)}}{\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{H}_2 \mathrm{O}\right)\right]^{3+}},\underset{\large \text{(D)}}{\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_4\right]^{2+}}\) The correct order of A, B, C and D in terms of wavenumber of light absorbed is :
The number of complexes from the following with no electrons in the \(t_2\) orbital is \(\qquad\) \(\mathrm{TiCl}_4,\left[\mathrm{MnO}_4\right]^{-},\left[\mathrm{FeO}_4\right]^{2-},\left[\mathrm{FeCl}_4\right]^{-},\left[\mathrm{CoCl}_4\right]^{2-}\)
The correct sequence of ligands in the order of decreasing field strength is :
Select the option with correct property:
The coordination geometry around the manganese in decacarbonyldimanganese$(0)$