JEE Main Chemistry — Inorganic Chemistry previous year questions with solutions.
The covalency and oxidation state respectively of boron in ${[{\mathrm{BF}}_{4}]}^{-}$, are
The difference in the oxidation state of $\mathrm{Xe}$ between the oxidised product of $\mathrm{Xe}$ formed on complete hydrolysis of ${\mathrm{XeF}}_{4}$and ${\mathrm{XeF}}_{4}$ is
Sum of oxidation states of bromine in bromic acid and perbromic acid is
Given below are two statements: Statement I : Aqueous solution of ${K}_{2}{\mathrm{Cr}}_{2}{O}_{7}$ is preferred as a primary standard in volumetric analysis over ${\mathrm{Na}}_{2}{\mathrm{Cr}}_{2}{O}_{7}$ aqueous solution. Statement II : ${K}_{2}{\mathrm{Cr}}_{2}{O}_{7}$ has a higher solubility in water than ${\mathrm{Na}}_{2}{\mathrm{Cr}}_{2}{O}_{7}$. In the light of the above statements, choose the correct answer from the options given below:
The sum of bridging carbonyls in $W{(\mathrm{CO})}_{6}$ and ${\mathrm{Mn}}_{2}{(\mathrm{CO})}_{10}$ is _____ .
Which of the following oxides is amphoteric?
Potassium dichromate acts as a strong oxidizing agent in acidic solution. During this process, the oxidation state changes from
The sum of oxidation state of the metals in $\mathrm{Fe}(\mathrm{CO}{)}_{5}$, ${\mathrm{VO}}^{2+}$ and ${\mathrm{WO}}_{3}$ is
When a solution of mixture having two inorganic salts was treated with freshly prepared ferrous sulphate in acidic medium, a dark brown ring was formed whereas on treatment with neutral ${\mathrm{FeCl}}_{3}$, it gave deep red colour which disappeared on boiling and a brown red ppt was formed. The mixture contains
The correct order of metallic character is
Match the List-I with List-II : <table class="pyq-table"><tbody><tr><td>Cations</td><td>Group reaction</td></tr><tr><td>$P\rightarrow {\mathrm{Pb}}^{2+},{\mathrm{Cu}}^{2+}$</td><td>${H}_{2}S$ gas in presence of dilute $\mathrm{HCl}$</td></tr><tr><td>$Q\rightarrow {\mathrm{Al}}^{3+},{\mathrm{Fe}}^{3+}$</td><td>${({\mathrm{NH}}_{4})}_{2}{\mathrm{CO}}_{3}$ in presence of ${\mathrm{NH}}_{4}\mathrm{OH}$</td></tr><tr><td>$R\rightarrow {\mathrm{Co}}^{2+},{\mathrm{Ni}}^{2+}$</td><td>${\mathrm{NH}}_{4}\mathrm{OH}$ in presence of ${\mathrm{NH}}_{4}\mathrm{CI}$</td></tr><tr><td>$S\rightarrow {\mathrm{Ba}}^{2+},{\mathrm{Ca}}^{2+}$</td><td>${H}_{2}S$ in presence of ${\mathrm{NH}}_{4}\mathrm{OH}$</td></tr></tbody></table>
Given below are two statements: Statement I: Boron is extremely hard indicating its high lattice energy. Statement II: Boron has highest melting and boiling point compared to its other group members. In the light of the above statements, choose the most appropriate answer from the options given below
Which of the following has the highest first ionization energy?
During the borax bead test with ${\mathrm{CuSO}}_{4}$, a blue green colour of the bead was observed in oxidising flame due to the formation of
The correct order of electronegativity for given elements is
Given below are two statements: Statement I: The decrease in first ionization enthalpy from $B$ to $\mathrm{Al}$ is much larger than that from $\mathrm{Al}$ to $\mathrm{Ga}$. Statement II: The d orbitals in $\mathrm{Ga}$ are completely filled. In the light of the above statements, choose the most appropriate answer from the options given below
${\mathrm{Nd}}^{2+}=______$
${\mathrm{ClF}}_{5}$ at room temperature is a
The number of species from the following which have square pyramidal structure is $_______$ ${\mathrm{PF}}_{5},{\mathrm{BrF}}_{4}^{-},{\mathrm{IF}}_{5},{\mathrm{BrF}}_{5},{\mathrm{XeOF}}_{4},{\mathrm{ICl}}_{4}^{-}$
According to $\mathrm{MO}$ theory the bond orders for ${{O}_{2}}^{2-}$, $\mathrm{CO}$ and ${\mathrm{NO}}^{+}$ respectively, are
For ${\mathrm{OF}}_{2}$ molecule consider the following: (A) Number of lone pairs on oxygen is $2$. (B) $\mathrm{FOF}$ angle is less than $104.5^{\circ}$. (C) Oxidation state of $O$ is $-2$. (D) Molecule is bent '$V$' shaped. (E) Molecular geometry is linear. Correct options are:
Identify $X,Y$ and $Z$ in the following reaction. (Equation not balanced) $\mathrm{Cl}\overset{\cdot }{O}+{\mathrm{NO}}_{2}\rightarrow \underset{¯}{X}\overset{{H}_{2}O}{\longrightarrow }\underset{¯}{Y}+\underset{¯}{Z}$
Sum of $\pi$-bonds present in peroxodisulphuric acid and pyrosulphuric acid is
The compound which does not exist is