Question

The correct electronic configuration and spin-only magnetic moment (BM) of ${\mathrm{Gd}}^{3+}(\mathrm{Z}=64),$ respectively, are :

JEE Main 2020 (05 Sep Shift 1)

Options

• A: $\left[\mathrm{Xe}\right]4{\mathrm{f}}^7$ and $8.9$
• B: $\left[\mathrm{Xe}\right]4{\mathrm{f}}^7$ and $7.9$
• C: $\left[\mathrm{Xe}\right]5{\mathrm{f}}^7$ and $8.9$
• D: $\left[\mathrm{Xe}\right]5{\mathrm{f}}^7$ and $7.9$

Question

Potassium permanganate on heating at $513 \mathrm{K}$ gives a product which is :

JEE Main 2021 (27 Aug Shift 2)

Options

• A: paramagnetic and colourless
• B: diamagnetic and colourless
• C: diamagnetic and green
• D: paramagnetic and green

Question

In the ground state of atomic $\mathrm{Fe}(\mathrm{Z}=26)$, the spin-only magnetic moment is $\times {10}^{-1}\mathrm{BM}$. (Round off to the Nearest Integer).
[ Given $:\sqrt{3}=1.73,\sqrt{2}=1.41]$

JEE Main 2021 (17 Mar Shift 2)

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Question

The metal ion (in gaseous state) with lowest spin-only magnetic moment value is

JEE Main 2022 (25 Jun Shift 2)

Options

• A: ${\mathrm{V}}^{2+}$
• B: ${\mathrm{Ni}}^{2+}$
• C: ${\mathrm{Cr}}^{2+}$
• D: ${\mathrm{Fe}}^{2+}$

Question

The spin-only magnetic moment value of the compound with strongest oxidizing ability among ${\mathrm{MnF}}_4,{\mathrm{MnF}}_3$ and ${\mathrm{MnF}}_2$ is_____ $\mathrm{B}.\mathrm{M}$ (nearest integer)

JEE Main 2022 (26 Jul Shift 2)

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Question

The oxidation state of manganese in the product obtained in a reaction of potassium permanganate and hydrogen peroxide in basic medium is

JEE Main 2022 (27 Jul Shift 2)

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Question

Acidified potassium permanganate solution oxidises oxalic acid. The spin-only magnetic moment of the mangenese product formed from the above reaction is B.M.___(Nearest Integer)

JEE Main 2022 (27 Jun Shift 1)

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Question

An acidified manganate solution undergoes disproportionation reaction. The spin-only magnetic moment value of the product having manganese in higher oxidation state is____B.M. (Nearest integer)

JEE Main 2022 (29 Jun Shift 1)

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Question

Choose the correct stability order of group $13$ elements in their $+1$ oxidation state.

JEE Main 2022 (26 Jun Shift 1)

Options

• A: $\mathrm{Al}<\mathrm{Ga}<\mathrm{In}<\mathrm{Tl}$
• B: $\mathrm{Tl}<\mathrm{In}<\mathrm{Ga}<\mathrm{Al}$
• C: $\mathrm{In}<\mathrm{Tl}<\mathrm{Ga}<\mathrm{Al}$
• D: $\mathrm{Ga}<\mathrm{In}<\mathrm{Al}<\mathrm{Tl}$

Question

Highest oxidation state of $\mathrm{Mn}$ is exhibited in ${\mathrm{Mn}}_2{\mathrm{O}}_7$. The correct statements about ${\mathrm{Mn}}_2{\mathrm{O}}_7$ are

(A) $\mathrm{Mn}$ is tetrahedrally surrounded by oxygen atoms
(B) $\mathrm{Mn}$ is octahedrally surrounded by oxygen atoms
(C) Contains $\mathrm{Mn}-\mathrm{O}-\mathrm{Mn}$ bridge
(D) Contains $\mathrm{Mn}-\mathrm{Mn}$ bond.

Choose the correct answer from the options given below

JEE Main 2023 (01 Feb Shift 1)

Options

• A: A and C only
• B: A and D only
• C: B and D only
• D: B and C only

Question

A solution of ${\mathrm{CrO}}_5$ in amyl alcohol has a....colour

JEE Main 2023 (29 Jan Shift 2)

Options

• A: Green
• B: Orange-Red
• C: Yellow
• D: Blue

Question

The set of correct statements is:

(i) Manganese exhibits $+7$ oxidation state in its oxide.

(ii) Ruthenium and Osmium exhibit $+8$ oxidation in their oxides.

(iii) $\mathrm{Sc}$ shows $+4$ oxidation state which is oxidizing in nature.

(iv) $\mathrm{Cr}$ shows oxidising nature in $+6$ oxidation state.

JEE Main 2023 (29 Jan Shift 2)

Options

• A: (ii) and (iii)
• B: (i), (ii) and (iv)
• C: (i) and (iii)
• D: (ii), (iii) and (iv)

Question

Given below are two statements:

Statement I : Aqueous solution of ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ is preferred as a primary standard in volumetric analysis over ${\mathrm{Na}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ aqueous solution.

Statement II : ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ has a higher solubility in water than ${\mathrm{Na}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$. In the light of the above statements, choose the correct answer from the options given below:

JEE Main 2023 (10 Apr Shift 1)

Options

• A: Statement $\mathrm{I}$ is false but Statement $\mathrm{II}$ is true
• B: Both Statement $\mathrm{I}$ and Statement $\mathrm{II}$ are true
• C: Statement $\mathrm{I}$ is true but Statement $\mathrm{II}$ is false
• D: Both Statement $\mathrm{I}$ and Statement $\mathrm{II}$ are false

Question

Prolonged heating is avoided during the preparation of ferrous ammonium sulphate to

JEE Main 2023 (10 Apr Shift 1)

Options

• A: Prevent hydrolysis
• B: Prevent reduction
• C: Prevent breaking
• D: Prevent oxidation

Question

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

JEE Main 2023 (11 Apr Shift 1)

Options

• A: ${\mathrm{SO}}_3^{2-}\&{\mathrm{CH}}_3{\mathrm{COO}}^{-}$ 
• B: ${\mathrm{CH}}_3{\mathrm{COO}}^{-}\&{\mathrm{NO}}_3^{-}$ 
• C:  ${\mathrm{SO}}_3^{2-}\&{\mathrm{C}}_2{\mathrm{O}}_4^{2-}$ 
• D:  ${\mathrm{C}}_2{\mathrm{O}}_4^{2-}\&{\mathrm{NO}}_3^{-}$

Question

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 :

JEE Main 2024 (04 Apr Shift 2)

Options

• A: \(\mathrm{CaI}_2\)
• B: \(\mathrm{NaBr}\)
• C: \(\mathrm{KNO}_3\)
• D: \(\mathrm{NH}_4 \mathrm{Cl}\)

Question

The metal that shows highest and maximum number of oxidation state is :

JEE Main 2024 (05 Apr Shift 1)

Options

• A: \(\mathrm{Fe}\)
• B: \(\mathrm{Mn}\)
• C: Co
• D: Ti

Question

The spin-only magnetic moment value of the ion among \(\mathrm{Ti}^{2+}, \mathrm{V}^{2+}, \mathrm{Co}^{3+}\) and \(\mathrm{Cr}^{2+}\), that acts as strong oxidising agent in aqueous solution is _______ BM (Near integer). (Given atomic numbers : \(\mathrm{Ti}: 22, \mathrm{~V}: 23, \mathrm{Cr}: 24, \mathrm{Co}: 27\))

JEE Main 2024 (05 Apr Shift 1)

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Question

The 'spin only' magnetic moment value of \(\mathrm{MO}_4{ }^{2-}\) is _______ BM. (Where M is a metal having least metallic radii. among \(\mathrm{Sc}, \mathrm{Ti}, \mathrm{V}, \mathrm{Cr}, \mathrm{Mn}\) and \(\mathrm{Zn}\) ). (Given atomic number: \(\mathrm{Sc}=21, \mathrm{Ti}=22, \mathrm{~V}=23, \mathrm{Cr}=24, \mathrm{Mn}=25\) and \(\mathrm{Zn}=30\))

JEE Main 2024 (08 Apr Shift 1)

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Question

Number of colourless lanthanoid ions among the following is ________ \(\mathrm{Eu}^{3+}, \mathrm{Lu}^{3+}, \mathrm{Nd}^{3+}, \mathrm{La}^{3+}, \mathrm{Sm}^{3+}\)

JEE Main 2024 (09 Apr Shift 1)

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Question

Which of the following acts as a strong reducing agent? (Atomic number : $\mathrm{Ce}=58,\mathrm{Eu}=63$, $\mathrm{Gd}=64,\mathrm{Lu}=71)$

JEE Main 2024 (29 Jan Shift 2)

Options

• A: ${\mathrm{Lu}}^{3+}$
• B: ${\mathrm{Gd}}^{3+}$
• C: ${\mathrm{Eu}}^{2+}$
• D: ${\mathrm{Ce}}^{4+}$

Question

Match List-I with List-II

Choose the correct answer from the options given below:

JEE Main 2024 (30 Jan Shift 1)

Options

• A: (A)-I, (B)-II, (C)-III, (D)-IV
• B: (A)-III, (B) - IV, (C) - I, (D)-II
• C: (A)-IV, (B)-III, (C)-I, (D)-II
• D: (A)-II, (B)-I, (C)-IV, (D)-III

Question

Which of the following compounds show colour due to $\mathrm{d}-\mathrm{d}$ transition?

JEE Main 2024 (01 Feb Shift 2)

Options

• A: ${\mathrm{CuSO}}_4·5{\mathrm{H}}_2\mathrm{O}$
• B: ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$
• C: ${\mathrm{K}}_2{\mathrm{CrO}}_4$
• D: ${\mathrm{KMnO}}_4$

Question

Given below are two statements : one is labelled as Assertion $\left(\mathrm{A}\right)$ and the other is labelled as Reason $\left(\mathrm{R}\right).$

Assertion $\left(\mathrm{A}\right)$ : In aqueous solutions ${\mathrm{Cr}}^{2+}$ is reducing while ${\mathrm{Mn}}^{3+}$ is oxidising in nature.

Reason $\left(\mathrm{R}\right):$ 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:

JEE Main 2024 (01 Feb Shift 2)

Options

• A: Both $\left(\mathrm{A}\right)$ and $\left(\mathrm{R}\right)$ are true and $\left(\mathit{R}\right)$ is the correct explanation of $\left(\mathrm{A}\right)$
• B: Both $\left(\mathrm{A}\right)$ and $\left(\mathrm{R}\right)$ are true but $\left(\mathrm{R}\right)$ is not the correct explanation of $\left(\mathrm{A}\right)$
• C: $\left(\mathrm{A}\right)$ is false but $\left(\mathrm{R}\right)$ is true
• D: $\left(\mathrm{A}\right)$ is true but $\left(\mathrm{R}\right)$ is false

Question

In alkaline medium. ${\mathrm{MnO}}_4^{-}$ oxidises ${\mathrm{I}}^{-}$ to

JEE Main 2024 (29 Jan Shift 1)

Options

• A: ${\mathrm{IO}}_4^{-}$
• B: ${\mathrm{IO}}^{-}$
• C: ${\mathrm{I}}_2$
• D: ${\mathrm{IO}}_3^{-}$