CBSE > Class 11 > Chemistry | CBSE Board | Homework Help

Molar mass of C2H4 (ethene) = 2×12+4×1 = 28 g Moles of ethene = Given mass / Molar mass =2.8g/28g mol^-1 =0.1 mol 1 mole = 6.022 × 10^23 atoms 0.1 mole = (6.022 ×10^23 atoms/1 mole)× 0.1 mole = 6.022 ×10^22 atoms 1 atom of C2H4 has electrons = 10 6.022×10^22 atoms of C2H4 have electrons = 6.022 ×10^22 ×10 = 6.022 ×10^22 electrons

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Limiting regent

Posted by Rambo Equbal 2 days, 3 hours ago

CBSE > Class 11 > Chemistry

2 answers

Shweta Dhama...👑 1 day, 15 hours ago

Limiting regent is define as the reactants which consumed first limits the amount of product formed.....

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Preeti Rahi 1 day, 22 hours ago

It is the element which is present in lesser amount than required

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30.00 how much significant figure are there? 3 or 4?

Posted by Chirag Sangwan 2 days, 10 hours ago

CBSE > Class 11 > Chemistry

3 answers

Bhole Nath 1 day, 22 hours ago

There are for significant figure

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Aditi Virmani 2 days ago

How 3 why nt 4?

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Paulo Dybala 2 days, 1 hour ago

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For n=3 , l=2, ml=-1,-2,0,1,2 I'm which orbital it lie

Posted by Muskaan Thakur 2 days, 14 hours ago

CBSE > Class 11 > Chemistry

2 answers

Akanksha Thakur 1 day, 16 hours ago

It could be written as - 3d^10

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Akanksha Thakur 1 day, 16 hours ago

It lies in d orbital

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What is quantum numberd

Posted by Himanshu Kumar 2 days, 20 hours ago

CBSE > Class 11 > Chemistry

1 answers

Yogita Ingle 2 days, 20 hours ago

Quantum numbers: Quantum numbers are numbers that designate and distinguish various atomic orbitals and electrons present in an atom.
Four quantum numbers are used to define the state of an electron completely, namely principal quantum number, azimuthal quantum number, magnetic quantum number and spin quantum number.

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Basic difference between ACCURACY AND PRECISION?

Posted by Pallav Kashyap 2 days, 22 hours ago

CBSE > Class 11 > Chemistry

2 answers

Rohit Dabas 2 days, 14 hours ago

Well suppose an experiment is conducted and observations are noted down. Now acuarry means that how correct the observation is to the true value,but precision means how close the observation is to each other.HOPE YOU LIKE THIS BASIC DIFFERENCE.

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Yogita Ingle 2 days, 21 hours ago

Basis	Accuracy	Precision
Definition	It could be defined as the level of correctness of a measurement to its true value.	It could be defined as the sharp exactness of a measurement.
Measurement Method	Has one factor used for measuring.	Has multiple factors for measurement.
Mutual Relationship	Accurate items have to be precise in most cases.	Precise items may or may not be accurate.

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Is quanta same as photon??? Or photons and quanta are equal??

Posted by Preeti Rahi 4 days ago

CBSE > Class 11 > Chemistry

4 answers

Allan Krish 3 days, 11 hours ago

Quanta and photon both are same but when we talk about energy then we use photon for sun light

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Nisha Solanki 3 days, 13 hours ago

Yes they are same.. Quanta term was given by Albert Einstein

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Kunal Sharma 3 days, 14 hours ago

A quanta is a particle of E.M. Radiation but a photon is a special type of quanta particle which is the small pocket of energy of visible light.

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Sia 🤖 3 days, 23 hours ago

One quantum of electromagnetic energy is called a photon. The plural of quantum is quanta. The concept of photons and quanta comes from quantum mechanics and quantum theory.

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Describe few solution for disposal of electronic waste with the help of chemistry.

Posted by Siddharth Mishra 4 days, 1 hour ago

CBSE > Class 11 > Chemistry

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Numericals on law of multiple proportion

Posted by Sanjana Rawat 4 days, 3 hours ago

CBSE > Class 11 > Chemistry

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What is the difference btw 2.0g and 2.00g mass and which is more precise mass

Posted by Jitender Bhati 4 days, 7 hours ago

CBSE > Class 11 > Chemistry

2 answers

Preeti Rahi 1 day, 22 hours ago

2.00 is more precise as it tells mass upto 2 decimal places

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Medhya Mittal 4 days, 5 hours ago

2.00 is the more precise mass

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Why is there use of spin quantam number ? I am asking this question bcz it doest not tell actual position of electron🤔🤔🤔🤔🤔🤔 Plz help me i cant find its reason🤗🤗🤗

Posted by Tiyasha Agrawal 5 days, 14 hours ago

CBSE > Class 11 > Chemistry

1 answers

Sia 🤖 4 days, 20 hours ago

The Spin Quantum Number (ms) describes the angular momentum of an electron. An electron spins around an axis and has both angular momentum and orbital angular momentum. Therefore the first electron in an orbital will have a spin of +1/2. After all the orbitals are half filled, the electrons start to pair up.

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A 5 percent aqueous solution of cane sugar has a freezing point of 271 Kelvin .Calculate the freezing point of 5 percent aqueous solution of glucose. Given that freezing point of water is 273.15 kelvin

Posted by Karthic Aryaas 5 days, 16 hours ago

CBSE > Class 11 > Chemistry

1 answers

Sia 🤖 4 days, 21 hours ago

Given,5% sugar solution means, {tex}w_B{/tex} = 5g
{tex}{w_A} = 95g,\,{M_B} = 342g\,mo{l^{ - 1}}{/tex}
Similarly, for 5% glucose solution, {tex}{w_B}(glu\cos e) = 5g{/tex}
{tex}{w_A} = 95\,g\,and {M_B}(glu\cos e) = 180\,g\,mo{l^{ - 1}}{/tex}
{tex}\Delta {T_f}(cane\,sugar) = \,273.15K - 271K = 2.15K{/tex}
{tex}\Delta {T_f} = \frac{{{K_f} \times {w_B} \times 1000}}{{{M_B}{w_A}}}{/tex}
{tex}2.15 = \frac{{{K_f} \times 5 \times 1000}}{{342 \times 95}}{/tex}
{tex}{k_f} = \frac{{2.15 \times 342 \times 95}}{{5 \times 1000}} = 13.9707{/tex}
similarly, for glucose
{tex}\Delta {T_f}(glu\cos e) = \frac{{13.9707 \times 5 \times 1000}}{{180 \times 95}}{/tex}
{tex}\Delta {T_f} = 4.085K{/tex}
Freezing point of the solution
= 273.15K - 4.085K = 269.065 K

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What is eistein equation?

Posted by Shivani Sharma 6 days ago

CBSE > Class 11 > Chemistry

2 answers

Priya Lvk 5 days, 11 hours ago

Einstein equation is E=mc^2

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Yogita Ingle 5 days, 23 hours ago

The Einstein Field Equation (EFE) are also known as Einstein’s equation. There are the set of ten equations extracted from Albert Einstein’s General Theory of Relativity. The EFE describes basic interaction of gravitation. The equations were first published in 1915 by Albert Einstein as a tensor equation.

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What is exception of metal,non metal or metalloid?

Posted by Satyam Krishna 6 days, 2 hours ago

CBSE > Class 11 > Chemistry

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Yash Goswami💞😎😎😎💞 4 days, 5 hours ago

Hydrogen

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Yogita Ingle 5 days, 21 hours ago

Metals-

Metals are usually solid but mercury is metal which is a liquid.

According to the properties of metals, metals are hard but sodium and potassium is so soft that it can be cut with a knife.

Nonmetals-

Graphite is a nonmetal that can conduct electricity. (We generally know that nonmetals are insulators)

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how many moles of sulphur will be produced when 2 moles of H2S reacts with 11.2 of SO2 at N.T.P

Posted by Santosh Kumar Singh 6 days, 3 hours ago

CBSE > Class 11 > Chemistry

1 answers

Sia 🤖 3 days, 20 hours ago

This is a simple question of Limiting Reagent.
Here is the balanced Equation : 2H₂S +SO₂ {tex}\rightarrow{/tex} 2H₂O + 3S
Thus if 2 moles of H₂S reacts with 1 mol of SO₂ then 3 moles of S will be formed
But in the given condition, SO₂ is only half mole (11.2 L of gas at STP represents half mole), thus it is limiting Reagent.
Thus if 1 mol of SO₂ gives 3 moles of sulfur, then 0.5 Moles of it will give 1.5 moles of sulfur.