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Chemistry Class 12th

How many of the following compound contain sulphur atom?

Pyrrole, Furan, Thiophene, Cysteine, Tyrosine, Pyridine

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alok kumar singh

Contributor-Level 10

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4 months ago

Chemistry Class 11th

How many of the following species have bond order = 1 and are paramagnetic as well?

$H e_{2}^{2 +}; O_{2}^{2 -}; N e_{2}^{2 +}; F_{2}; B_{2}; H_{2}; O_{2}^{2 +}$

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alok kumar singh

Contributor-Level 10

B₂ have bond order equal to 1 and also paramagnetic.

$H e_{2}^{2 +} O_{2}^{2 -} N e_{2}^{2 +} F_{2} H_{2}$ have bond order equal to 1 but are diamagnetic.

$O_{2}^{2 +}$ have bond order equal to 3.

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Chemistry Class 12th

What is the weightage of Class 12 Chapter 1 Solutions in CBSE and other competitive exams?

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nitesh singh

Contributor-Level 10

After the 2023-24 revised CBSE syllabus, many chapters have been removed, and in some chapters syllabus is reduced. As per the latest CBSE exam pattern 2025-26, the Chapter 1 Solutions will be asked for 5-7 marks in the Class 12 Chemistry CBSE board exams.

For other competitive exams, the Solutions chapter has a medium weightage in the NEET exam. In the NEET exam, 1-2 questions are frequently asked based on the concept of moderate-level numerical.

Physical Chemistry holds over 30% weightage in the chemistry section in the JEE Mains exam. The solutions chapter is considered a part of physical chemistry. You can expect 1 question fo

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Chemistry Class 11th

How many of the following compounds have one lone pair in central atom?

ClF₃, XeO₃, BrF₅, XeF₄, O₃, NH₃

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alok kumar singh

Contributor-Level 10

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4 months ago

Chemistry Class 12th

Positive Fehling solution test is given by

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alok kumar singh

Contributor-Level 10

Fehling solution test can be given by aldehyde except aromatic aldehyde

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Chemistry Chemistry Chemical Kinetics

Given $K_{n e t} = \frac{K_{1} K_{2}}{K_{3}}$ when $E_{a_{1}}$ =40 kJ/mol

$E_{a_{1}}$ =50 kJ/mol. = $E_{a_{1}}$ 60 kJ/mol

Calculate value of (E_a)_net in kJ/mol

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alok kumar singh

Contributor-Level 10

(E_a)_net = $E_{a_{1}}$ + $E_{a_{2}}$ – $E_{a_{3}}$

= 40 + 50 – 60

= 90 – 60

= 30kJ/mol

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4 months ago

Chemistry Chemistry Solutions

Calculate the molarity of a solution having density = 1.5g/mL %(w/w) of solute is 36% and molecular 36 g/mol

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alok kumar singh

Contributor-Level 10

Assume mass of solution

= 100g

Mass of solute = 36gm

Moles of solute = 1

Molarity= $\frac{1 * 1000}{(\frac{100}{1.5})} = \frac{1000}{100} * 1.5 = 15$

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4 months ago

Chemistry Structure of Atom

For Rb(37) which of the following set of quantum numbers are correct for valence electron?

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alok kumar singh

Contributor-Level 10

₃₇Rb = 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 5s¹

Last electron enters in 5s subshell

Value of quantum numbers

n = 5, l = 0, m = 0, s = $\pm \frac{1}{2}$

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4 months ago

Chemistry Ncert Solutions Chemistry Class 12th

What are the benefits of using Class 12 Chemistry Chapter 1 NCERT Solutions?

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Esha Garg

Beginner-Level 5

NCERT offers the foundation for every class 12 student. CBSE board exam questions are primarily based on the NCERT exercise, Examples and conceptual explanation.

There are various benefits of using NCERT Solutions.

Specially for CBSE Board students, these NCERT Solutions are the best resource to prepare for the boards.
These NCERT Solutions include step-wise descriptive answer approach that will help you write good answers.
These solutions also help you understand problem-solving and how to approach a specific type of conceptual or numerical problem.
If you are preparing for the JEE or NEEt exam, these solutions can be your first deci

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4 months ago

Chemistry Class 11th

xCl₂+yOH^– zCl^–+pClO^–

Balance the above reaction and find out values of x, y, z and p.

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alok kumar singh

Contributor-Level 10

After balancing change in oxidation state,

2Cl₂ $\overset{}{\to}$ 2Cl^– + 2ClO^–

Next, balance 'O' atoms,

2Cl₂ +4OH^– $\overset{}{\to}$ 2Cl^– + 2ClO^–+ 2H₂O

Simplifying to get the simplest ratios,

Cl₂ +2OH^– $\overset{}{\to}$ Cl^–+ClO^–+ H₂O

x = 1, y = 2, z = 1, p = 1

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