Chemistry of Mn and Cr Compounds Recommended PYQs (STRICTLY NCERT Based) The d and f Block Elements Chemistry NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

Number of moles of $\text{MnO}_4^-$ getting reduced to $\text{Mn}^{2+}$ under acidic condition by $4.517\times10^{24}$ electrons is:

1. 1.5 moles
2. 7.5 moles
3. 2.5 moles
4. 5.0 moles

Subtopic: Chemistry of Mn and Cr Compounds |

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The manganate and permanganate ions are tetrahedral, due to:

1.	The π-bonding involves the overlap of d-orbitals of oxygen with d-orbitals of manganese.
2.	The π-bonding involves the overlap of p-orbitals of oxygen with d-orbitals of manganese.
3.	Absence of π-bonding.
4.	The π-bonding involves the overlap of p-orbitals of oxygen with p-orbitals of manganese.

Subtopic: Chemistry of Mn and Cr Compounds |

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When neutral or faintly alkaline $K M n O_{4}$ is treated with potassium iodide, iodide ion is converted into 'X'. 'X' is:

1. $I_{2}$

2. $I O_{4}^{-}$

3. $I O_{3}^{-}$

4. $I O^{-}$

Subtopic: Chemistry of Mn and Cr Compounds |

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A gas that can readily decolorize an acidified KMnO₄ solution is:

1. ${SO}_{2}$

2. ${NO}_{2}$

3. $P_{2} O_{5}$

4. ${CO}_{2}$

Subtopic: d-Block Elements- Properties & Uses | Chemistry of Mn and Cr Compounds |

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SO₂ is passed through an acidified K₂Cr₂O₇solution.
The correct statement among the following regarding the above experiment is:

1. The solution gets decolorized.

2. SO₂ gets reduced.

3. Green coloured Cr₂(SO₄)₃ gets formed.

4. The solution turns blue.

Subtopic: Chemistry of Mn and Cr Compounds |

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In acidic medium, H₂O₂ changes Cr₂O₇^–2 to CrO₅ which has two (–O – O–) bonds.
The oxidation state of Cr in CrO₅ is:

1. +5

2. +3

3. +6

4. -10

Subtopic: Chemistry of Mn and Cr Compounds |

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Considering the following reaction,
3 MnO ₄^2–+ 2 H ₂ O ⇌ 2 MnO₄^– + MnO ₂+ 4 OH^–
The reagent that facilitates the removal of OH^– ions to ensure the completion of the conversion of K₂MnO₄ to KMnO₄ is:

1. KOH
2. CO₂
3. SO₂
4. HCl

Subtopic: Chemistry of Mn and Cr Compounds |

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