-->Consider the following compounds: <span class="m...

Hint : In peroxide, the oxidation state of oxygen is -1. \(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\) Explanation: Oxidation state (or oxidation number) can be calculated by following a set of standard rules: (i) The oxidation state of a monoatomic ion is equal to its charge. (ii) Group 1 (alkali metals) always has an oxidation state of +1; Group 2 (alkaline earth metals) are always +2. (iii) Hydrogen is +1 (except when bonded to metals in hydrides, where it is -1). (iv) Fluorine is always -1; other halogens are usually -1 unless bonded to oxygen or more electronegative halogens. (v) The sum of oxidation states in a neutral compound is zero; in a polyatomic ion, it equals the ion's charge. (vi) Oxygen is usually -2 (except in peroxides, where it is -1, and in superoxides, it is -1/2 and in compounds with fluorine). The oxidation states of the underlined atoms in the given compounds are as follows: S.No. Compound Oxidation state calculation Oxidation state (x) 1 \(\underline KO_2\) \(x + 2(\frac {-1}{2}) = 0\) +1 2 \( H_2 \underline O_2\) \( 2 (+1)\ + 2x = 0\) -1 3 \(H_2 \underline SO_4\) \( 2 (+1)\ + x + 4(-2) = 0\) +6 Hence, option 3 is the correct answer.

Introduction To Redox And Oxidation Number - NEET Chemistry PYQs & Analysis

PYQ 2012

easy

chemistry ID: neet-201

N_{2} H_{4}

(1)

(2)

(3)

(4)

PYQ 2019

easy

chemistry ID: neet-201

The correct structure of tribromo octoxide is: 1. 2. 3. 4.

(1)

(2)

(3)

(4)

PYQ 2019

easy

chemistry ID: neet-201

2 {Cu}^{+}

(1)

(2)

(3)

(4)

PYQ 2020

easy

chemistry ID: neet-202

The incorrect oxidation number of the underlined atom in the following species is: 1. Cu 2 O is -1 2. Cl is +5 3. K 2 Cr 2 O 7 is +6 4. H Au Cl 4 is +3

(1)

(2)

(3)

(4)

PYQ 2022

easy

chemistry ID: neet-202

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 KO 2 is +4. 4. Ionisation enthalpy of alkali metals decreases from top to bottom in the group.

(1)

(2)

(3)

(4)

PYQ 2024

easy

chemistry ID: neet-202

Which reaction is NOT a redox reaction? 1. 2. 3. 4.

(1)

(2)

(3)

(4)

PYQ 2025

medium

chemistry ID: neet-202

Consider the following compounds: and 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

(1)

(2)

(3)

(4)

Preparing Introduction To Redox And Oxidation Number for NEET

Introduction To Redox And Oxidation Number is a specific sub-topic that frequently appears in the NEET examination. Understanding the underlying principles and practicing targeted questions is key to mastering this concept.

The questions compiled above are previous year questions (PYQs) directly related to Introduction To Redox And Oxidation Number. Practicing these specific questions helps you understand the difficulty level and the examiner's approach to this topic.

Topic Frequently Asked Questions

Is Introduction To Redox And Oxidation Number a high-weightage topic?

You can refer to the priority and consistency badges at the top of this page. High priority topics should be thoroughly revised multiple times before the exam.

Should I memorize the solutions?

No, it is highly recommended to understand the core concept and methodology behind each solution rather than memorizing them, as exact questions are rarely repeated, but the concepts definitely 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)	$2 {MnO}_{4}^{-} + 3 {Mn}^{2 +} + 2 H_{2} O$ $\to$ $5 {MnO}_{2} + 4 H^{\oplus}$

Introduction To Redox And Oxidation Number

High-Yield Trend

Questions
7 MCQs

Official Solution

Official Solution

Official Solution

Official Solution

Official Solution

Official Solution

Official Solution

Preparing Introduction To Redox And Oxidation Number for NEET

Topic Frequently Asked Questions

Is Introduction To Redox And Oxidation Number a high-weightage topic?

Should I memorize the solutions?

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

1.	Cu₂O is -1	2.	Cl $O_%7B3%7D%5E%7B-%7D$ is +5
3.	K₂Cr₂O₇ is +6	4.	HAuCl₄ is +3

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.

S.No.	Compound	Oxidation state calculation	Oxidation state (x)
1	$%5Cunderline%20KO_2$	$x%20%2B%202(%5Cfrac%20%7B-1%7D%7B2%7D)%20%3D%200$	+1
2	$H_2%20%5Cunderline%20O_2$	$2%20(%2B1)%5C%20%2B%202x%20%3D%200$	-1
3	$H_2%20%5Cunderline%20SO_4$	$2%20(%2B1)%5C%20%2B%20x%20%2B%204(-2)%20%3D%200$	+6

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

Introduction To Redox And Oxidation Number

High-Yield Trend

Questions 7 MCQs

Official Solution

Official Solution

Official Solution

Official Solution

Official Solution

Official Solution

Official Solution

Preparing Introduction To Redox And Oxidation Number for NEET

Topic Frequently Asked Questions

Is Introduction To Redox And Oxidation Number a high-weightage topic?

Should I memorize the solutions?

Questions
7 MCQs