JEE Main Chemistry — Inorganic Chemistry previous year questions with solutions.
Lowest Oxidation number of an atom in a compound ${A}_{2}B$ is $-2.$ The number of an electron in its valence shell is
Match List - I with List - II. <table class="pyq-table"><tbody><tr><td colspan="2" rowspan="1">List - I Compound</td><td colspan="2" rowspan="1">List-II Use</td></tr><tr><td>(A)</td><td>Carbon tetrachloride</td><td>(I)</td><td>Paint remover</td></tr><tr><td>(B)</td><td>Methylene chloride</td><td>(II)</td><td>Refrigerators and air conditioners</td></tr><tr><td>(C)</td><td>DDT</td><td>(III)</td><td>Fire extinguisher</td></tr><tr><td>(D)</td><td>Freons</td><td>(IV)</td><td>Non Biodegradable insecticide</td></tr></tbody></table>Choose the correct answer from the options given below:
Given below are two statements : Statement I : \(\quad \mathrm{PF}_5\) and \(\mathrm{BrF}_5\) both exhibit \(\mathrm{sp}^3 \mathrm{~d}\) hybridisation. Statement II : Both \(\mathrm{SF}_6\) and \(\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}\) exhibit \(\mathrm{sp}^3 \mathrm{~d}^2\) hybridisation. In the light of the above statements, choose the correct answer from the options given below :
Number of oxygen atoms present in chemical formula of fuming sulphuric acid is ______.
A diatomic molecule has a dipole moment of $1.2D$. If the bond distance is $1\overset{o}{A}$, then fractional charge on each atom is _____ $\times {10}^{-1}$ esu. (Given $1D={10}^{-18}\mathrm{esu}\mathrm{cm}$)
Given below are two statements : Statement I: Group $13$ trivalent halides get easily hydrolysed by water due to their covalent nature. Statement II: ${\mathrm{AlCl}}_{3}$ upon hydrolysis in acidified aqueous solution forms octahedral ${[\mathrm{Al}{({H}_{2}O)}_{6}]}^{3+}$ ion. In the light of the above statements, choose the correct answer from the options given below :
Given below are two statements: Statement (I) : Oxygen being the first member of group $16$ exhibits only$–2$ oxidation state. Statement (II) : Down the group $16$ stability of $+4$ oxidation state decreases and $+6$ oxidation state increases. In the light of the above statements, choose the most appropriate 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: The first ionisation enthalpy decreases across a period. Reason R: The increasing nuclear charge outweighs the shielding across the period. In the light of the above statements, choose the most appropriate from the options given below:
Give below are two statements: Statement-I : Noble gases have very high boiling points. Statement-II: Noble gases are monoatomic gases. They are held together by strong dispersion forces. Because of this they are liquefied at very low temperature. Hence, they have very high boiling points. In the light of the above statements. choose the correct answer from the options given below:
The difference in the 'spin-only' magnetic moment values of \(\mathrm{KMnO}_4\) and the manganese product formed during titration of \(\mathrm{KMnO}_4\) against oxalic acid in acidic medium is _______ BM. (nearest integer)
The statement(s) that are correct about the species \(\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}^{+}\)and \(\mathrm{Mg}^{2+}\). (A) All are isoelectronic (B) All have the same nuclear charge (C) \(\mathrm{O}^{2-}\) has the largest ionic radii (D) \(\mathrm{Mg}^{2+}\) has the smallest ionic radii Choose the most appropriate answer from the options given below :
A transition metal ' \(\mathrm{M}\) ' among \(\mathrm{Sc}, \mathrm{Ti}, \mathrm{V}, \mathrm{Cr}, \mathrm{Mn}\) and \(\mathrm{Fe}\) has the highest second ionisation enthalpy. The spin-only magnetic moment value of \(\mathrm{M}^{+}\)ion is _______. \(\mathrm{BM}\) (Near integer) (Given atomic number \(\mathrm{Sc}: 21, \mathrm{Ti}: 22, \mathrm{~V}: 23, \mathrm{Cr}: 24, \mathrm{Mn}: 25, \mathrm{Fe}: 26\))
${[\mathrm{Co}{({\mathrm{NH}}_{3})}_{6}]}^{3+}$ and ${[{\mathrm{CoF}}_{6}]}^{3-}$ are respectively known as:
Evaluate the following statements related to group 14 elements for their correctness. (A) Covalent radius decreases down the group from \(\mathrm{C}\) to \(\mathrm{Pb}\) in a regular manner. (B) Electronegativity decreases from \(\mathrm{C}\) to \(\mathrm{Pb}\) down the group gradually. (C) Maximum covalance of \(\mathrm{C}\) is 4 whereas other elements can expand their covalance due to presence of d orbitals. (D) Heavier elements do not form \(\mathrm{p} \pi-\mathrm{p} \pi\) bonds. (E) Carbon can exhibit negative oxidation states. Choose the correct answer from the options given below :
While preparing crystals of Mohr's salt, dil \(\mathrm{H}_2 \mathrm{SO}_4\) is added to a mixture of ferrous sulphate and ammonium sulphate, before dissolving this mixture in water, dil \(\mathrm{H}_2 \mathrm{SO}_4\) is added here to :
Number of colourless lanthanoid ions among the following is ________ \(\mathrm{Eu}^{3+}, \mathrm{Lu}^{3+}, \mathrm{Nd}^{3+}, \mathrm{La}^{3+}, \mathrm{Sm}^{3+}\)
Select the compound from the following that will show intramolecular hydrogen bonding.
Number of molecules/ions from the following in which the central atom is involved in \(\mathrm{sp}^3\) hybridization is \(\qquad\) \(\mathrm{NO}_3^{-}, \mathrm{BCl}_3, \mathrm{ClO}_2^{-}, \mathrm{ClO}_3\)
Total number of unpaired electrons in the complex ions \(\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}\) and \(\left[\mathrm{NiCl}_4\right]^{2-}\) is \(\qquad\)
The correct increasing order for bond angles among \(\mathrm{BF}_3, \mathrm{PF}_3\) and \(\mathrm{ClF}_3\) is :
The element which shows only one oxidation state other than its elemental form is :
Number of metal ions characterized by flame test among the following is _________. ${\mathrm{Sr}}^{2+},{\mathrm{Ba}}^{2+},{\mathrm{Ca}}^{2+},{\mathrm{Cu}}^{2+},{\mathrm{Zn}}^{2+},{\mathrm{Co}}^{2+},{\mathrm{Fe}}^{2+}$
The number of species from the following that have pyramidal geometry around the central atom is _______. \(\mathrm{S}_2 \mathrm{O}_3^{2-}, \mathrm{SO}_4^{2-}, \mathrm{SO}_3^{2-}, \mathrm{S}_2 \mathrm{O}_7^{2-}\)
Arrange the following elements in the increasing order of number of unpaired electrons in it. (A) \(\mathrm{Sc}\) (B) \(\mathrm{Cr}\) (C) \(\mathrm{V}\) (D) \(\mathrm{Ti}\) (E) Mn Choose the correct answer from the options given below :