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Chemistry Class 11th

The species which does not exist is

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alok kumar singh

Contributor-Level 10

He₂ has zero bond order hence it does not exist.

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2 months ago

Chemistry Class 11th

Which among the following species is pyramidal in shape?

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alok kumar singh

Contributor-Level 10

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Chemistry Equilibrium

K_p for the given reaction is (36 * 10^–2atm^–1) Find out K_c (M^–1) (nearest integer).

(2NO₂ N₂O₄)

(R=0.0821 atm. L/mol. K)

(T = 300K)

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alok kumar singh

Contributor-Level 10

K_p = K_c (RT)^D^ng

36 * 10^–2 = K_c (0.0821 * 300)^–1

K_c = 0.36 * 0.0821 * 300 = 8.86 » 9

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2 months ago

Chemistry Chemistry Solutions

Osmotic pressure at 273 K is 7 * 10⁵ Pa, then what will be the value of x, if its osmotic pressure at 283 K is x * 10⁴ Pa?

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alok kumar singh

Contributor-Level 10

$π_{1} = i C R T_{1}$

$π_{2} = i C R T_{2}$

$\frac{π_{1}}{T_{1}} = \frac{π_{2}}{T_{2}}$

$π_{2} = \frac{π_{1} * T_{2}}{T_{1}}$

$= \frac{7 * 1 0^{5} * 283}{273}$

= 7.256 * 10⁵ * Pa

= 72.56 * 10⁴ Pa

p₂ = x * 10⁴

x = 72.56 » 73

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2 months ago

Chemistry Chemistry Electrochemistry

Through a ZnSO₄ solution, 0.015 A current was passed for 15 minutes. What is the mass of Zn deposited? (in mg)

(Atomic weight of Zn = 65.4 )

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alok kumar singh

Contributor-Level 10

Charge passed = It

= 0.015 * 15 * 60 C

Moles of electrons passed $= \frac{0.015 * 15 * 60}{96500}$

Moles of Zn deposited = $\frac{1}{2} * \frac{0.015 * 15 * 60}{96500}$

= 0.00007

Mass of Zn deposited = 0.00007 * 65.4 g = 4.58mg

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2 months ago

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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2 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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