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The correct decreasing order of oxidation state of the underlined atom in each molecule is:

1.	$\mathrm{\underline{P}_4 {O}_6>\underline{Cl}_2 {O}_7>\underline{Al} {H}_3}$
2.	$\mathrm{\underline {P}_4 {O}_{10}>\underline {S} {O}_3>{H}_2 \underline {O}}$
3.	$\mathrm{\underline{N}_2 {O}_5>\underline{Al}_2 {O}_3>{H}_2 \underline{S}}$
4.	$\mathrm{\underline{Pb}{O}_2>\underline{N}_2 {O}_3>\underline {S} {O}_3}$

Subtopic: Introduction to Redox and Oxidation Number |

71%

Level 2: 60%+

NEET - 2026

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Q2:

Consider the following compounds:
$\underline KO_2, H_2 \underline O_2$ and $H_2 \underline SO_4$
The oxidation states of the underlined elements in them are, respectively:
1. +1, -2 and +4
2. +4 , -4 and +6
3. +1, -1 and +6
4. +2, -2 and +6

Subtopic: Introduction to Redox and Oxidation Number |

58%

Level 3: 35%-60%

NEET - 2025

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Q3:

Which reaction is NOT a redox reaction?

1. $2 \mathrm{KClO}_3+\mathrm{I}_2 \rightarrow 2 \mathrm{KIO}_3+\mathrm{Cl}_2$
2. $\mathrm{H}_2+\mathrm{Cl}_2 \rightarrow 2 \mathrm{HCl}$
3. $\mathrm{BaCl}_2+\mathrm{Na}_2 \mathrm{SO}_4 \rightarrow \mathrm{BaSO}_4+2 \mathrm{NaCl}$
4. $\mathrm{Zn}+\mathrm{CuSO}_4 \rightarrow \mathrm{ZnSO}_4+\mathrm{Cu}$

Subtopic: Introduction to Redox and Oxidation Number |

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Level 2: 60%+

NEET - 2024

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Q4:

In the following reaction involving manganese:

3MnO₄²⁻ + 4H⁺ → 2MnO₄⁻ + MnO₂ + 2H₂O

Which oxidation state of manganese is not observed in the reaction?

A. +6
B. +2
C. +4
D. +7
E. +3

Mark the most appropriate answer from the options given below:

1.	D and E only	2.	B and D only
3.	A and B only	4.	B and E only

Subtopic: Introduction to Redox and Oxidation Number |

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Level 1: 80%+

NEET - 2024

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Q5:

Identify the incorrect statement from the following:

1.	Lithium is the strongest reducing agent among the alkali metals.
2.	Alkali metals react with water to form their hydroxides.
3.	The oxidation number of K in KO₂ is +4.
4.	Ionisation enthalpy of alkali metals decreases from top to bottom in the group.

Subtopic: Introduction to Redox and Oxidation Number |

68%

Level 2: 60%+

NEET - 2022

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Q6:

The correct example of metal displacement reaction among the following is:

1.	$\mathrm{Fe}+2 \mathrm{HCl} \rightarrow \mathrm{FeCl}_2+\mathrm{H}_2 \uparrow $
2.	$2 \mathrm{~Pb}\left(\mathrm{NO}_3\right)_2 \rightarrow 2 \mathrm{PbO}+4 \mathrm{NO}_2+\mathrm{O}_2 \uparrow $
3.	$ 2\text {KClO}_3 \xrightarrow {\Delta}2 \text {KCl} + 3 \text O_2 $
4.	$\mathrm{Cr}_2 \mathrm{O}_3+2 \mathrm{Al} \xrightarrow {\Delta} \mathrm{Al}_2 \mathrm{O}_3+2 \mathrm{Cr}$

Subtopic: Introduction to Redox and Oxidation Number |

71%

Level 2: 60%+

NEET - 2021

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Q7:

The incorrect oxidation number of the underlined atom in the following species is:

1.	Cu₂O is -1	2.	Cl$O_{3}^{-}$ is +5
3.	K₂Cr₂O₇ is +6	4.	HAuCl₄ is +3

Subtopic: Introduction to Redox and Oxidation Number |

82%

Level 1: 80%+

NEET - 2020

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Q8:

The correct structure of tribromo octoxide is:

1.
2.
3.
4.

Subtopic: Introduction to Redox and Oxidation Number |

76%

Level 2: 60%+

NEET - 2019

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Q9:

Disproportionation reactions are:

(a)	$2 {Cu}^{+}$ $\to$ ${Cu}^{2 +} + {Cu}^{0}$
(b)	$3 {MnO}_{4}^{2 -} + 4 H^{+}$ $\to$ $2 {MnO}_{4}^{-} + {MnO}_{2} + 2 H_{2} O$
(c)	$2 {KMnO}_{4}$ $\overset{∆}{\to}$ $K_{2} {MnO}_{4} + {MnO}_{2} + O_{2}$
(d)	$2 {MnO}_{4}^{-} + 3 {Mn}^{2 +} + 2 H_{2} O$ $\to$ $5 {MnO}_{2} + 4 H^{\oplus}$

1.	(a) and (d) only	2.	(a) and (b) only
3.	(a), (b) and (c)	4.	(a), (c) and (d)

Subtopic: Introduction to Redox and Oxidation Number |

61%

Level 2: 60%+

NEET - 2019

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Q10:

The highest oxidation number of nitrogen among the following compounds is:

1.	$N_{2} H_{4}$	2.	${NH}_{3}$
3.	$N_{3} H$	4.	${NH}_{2} OH$

Subtopic: Introduction to Redox and Oxidation Number |

62%

Level 2: 60%+

AIPMT - 2012

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1.	\(\mathrm{\underline{P}_4 {O}_6>\underline{Cl}_2 {O}_7>\underline{Al} {H}_3}\)
2.	\(\mathrm{\underline {P}_4 {O}_{10}>\underline {S} {O}_3>{H}_2 \underline {O}}\)
3.	\(\mathrm{\underline{N}_2 {O}_5>\underline{Al}_2 {O}_3>{H}_2 \underline{S}}\)
4.	\(\mathrm{\underline{Pb}{O}_2>\underline{N}_2 {O}_3>\underline {S} {O}_3}\)

1.	\(\mathrm{Fe}+2 \mathrm{HCl} \rightarrow \mathrm{FeCl}_2+\mathrm{H}_2 \uparrow \)
2.	\(2 \mathrm{~Pb}\left(\mathrm{NO}_3\right)_2 \rightarrow 2 \mathrm{PbO}+4 \mathrm{NO}_2+\mathrm{O}_2 \uparrow \)
3.	\( 2\text {KClO}_3 \xrightarrow {\Delta}2 \text {KCl} + 3 \text O_2 \)
4.	\(\mathrm{Cr}_2 \mathrm{O}_3+2 \mathrm{Al} \xrightarrow {\Delta} \mathrm{Al}_2 \mathrm{O}_3+2 \mathrm{Cr}\)

1.	Cu₂O is -1	2.	Cl\(O_{3}^{-}\) is +5
3.	K₂Cr₂O₇ is +6	4.	HAuCl₄ is +3

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