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4 weeks ago

Chemistry Solutions Chemistry

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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4 weeks ago

Chemistry Electrochemistry Chemistry

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 $= \frac{0.015 \times 15 \times 60}{96500}$

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

= 0.00007

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

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4 weeks ago

Biomolecules Chemistry

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 weeks ago

I want to delete this Shiksha account please help me

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4 weeks ago

How to delete this account

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4 weeks ago

Seoul National University

Should I know how to speak Korean to take admission to SNU?

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4 weeks ago

physics ncert solutions class 11th Motion in a Plane

A ball is projected from ground at angle q with the horizontal. After t = 1 s, it is moving at 45° with the horizontal and after t = 2 second, it is moving horizontally. What is speed of projection of ball? [g = 10 m s^–2]

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alok kumar singh

Contributor-Level 10

Please find the solution below:

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4 weeks 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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4 weeks ago

VSEPR Theory Chemistry Chemical Bonding and Molecular Structure

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 weeks ago

Aldehydes, Ketones and Carboxylic Acids Chemistry

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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4 weeks ago

Chemistry Chemical Kinetics Chemistry

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 weeks ago

Physics Class 11th

A ball is projected vertically up with an initial velocity. Which of the following graph represent KE of ball?

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alok kumar singh

Contributor-Level 10

Please find the solution below:

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4 weeks ago

Chemistry Solutions Chemistry

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 weeks ago

NCERT Notes NCERT Class 12 Chemistry

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

...more

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4 weeks ago

Chemistry Class 11th

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 weeks ago

physics ncert solutions class 11th Motion in a Straight Line

Distance travelled by a particle starting form rest and moving with an acceleration of 4/3ms^-2 in the second is

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alok kumar singh

Contributor-Level 10

Please find the solution below:

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4 weeks ago

Redox Reactions Chemistry

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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4 weeks ago

Institute of Science and Technology MICA

Mica ist phase registration kab start hai

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4 weeks ago

Block D and F Elements Chemistry

K₂Cr₂O₇ + H₂O₂ + H₂SO_{4
$\to_{c o n d i t i o n s}^{e t h e r c o l d}$} compound 'X' X is a chromium compound, what is the oxidation state of chromium in compound 'X'.

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alok kumar singh

Contributor-Level 10

K₂Cr₂O₇ + H₂O₂ + H₂SO₄-> + K₂SO₄ + H₂O compound 'X' is ->CrO₅

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4 weeks ago

Chemistry Coordination Compounds Chemistry

Match the following

	Column I (Complexes)		Column II (Metals)
A.	Vitamin B₁₂	(p)	Ti
B.	Wilkinson catalyst	(q)	Co
C.	Ziegler-Natta catalyst	(r)	Fe
D.	Haemoglobin	(s)	Rh