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WHAT IS THE RESONANCE?

Posted by Surendar Kumar Pal 8 years, 3 months ago

CBSE > Class 11 > Chemistry

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Manju Pandey 8 years, 3 months ago

More than one Lewis structure is required to explain the bonding in a molecule is called resonance

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What is thomson thory ? And what he say about the an atom

Posted by Tapan Sana 8 years, 3 months ago

CBSE > Class 11 > Chemistry

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Lavanya S 8 years, 3 months ago

J.J Thomson gave a model to explain the structure of the atom. He proposed that an atom looks like a plum pudding. In which the positive charge is uniformly distributed all over as like the base of the pudding and the negatively charged electrons are scattered like the embedded dry fruits all over the plum pudding

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Why cl is more electronegative than f ?

Posted by Neha Yadav 8 years, 3 months ago

CBSE > Class 11 > Chemistry

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Draw Lewis dot structure of CaF2?

Posted by Yash Shakya 8 years, 3 months ago

CBSE > Class 11 > Chemistry

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O2 is paramagnetic while O2²- is diamegnetic. Explain.

Posted by Pramita Das 8 years, 3 months ago

CBSE > Class 11 > Chemistry

1 answers

Priyanshu Sharma 8 years, 3 months ago

If any of the molecular orbital contains unpaired electrons, it is regarded as paramagnetic. Since O2 has (pi*2Px1=pi*2Py1) config. its paramagnetic while O2²- has (pi*2Px=pi*2Py²) config. it is diamagnetic.

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On the basis of quantum numbers justify that the 6th period of the periodic table should have 32 elements

Posted by Keshav Bhardwaj 8 years, 3 months ago

CBSE > Class 11 > Chemistry

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Utkarsh Gupta 8 years, 3 months ago

In the 6th period the existing sub shells are 6s, 4f, 5d, 6p. The total no. of orbitals in these sub shells are 16 ( 1 for s, 7 for f, 5 for d and 3 for p). Thus the total no. of elements in the sixth period should be 2×16 i.e as each orbital can have 2 electrons. Thus the 6th period should have 32 elements.

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What is dipole moment

Posted by Anurag Kumar 8 years, 3 months ago

CBSE > Class 11 > Chemistry

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Manju Pandey 8 years, 3 months ago

Dipole moment is the magnitude of charge multiplied by distance between them.

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The energy associated with the first orbit in hydrogen is 2.17 * 10^-18 joule per atom what is the energy associated with the 5th orbit? Calculate the Bohr radius of the 5th orbit of hydrogen atom

Posted by Akhil Ganapathy 8 years, 3 months ago

CBSE > Class 11 > Chemistry

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What is pseudo noble gas configuration?

Posted by Priyanshu Sharma 8 years, 3 months ago

CBSE > Class 11 > Chemistry

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Explain wave mechanical model of atom

Posted by Sagar Gulia 8 years, 3 months ago

CBSE > Class 11 > Chemistry

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What is environment

Posted by Siddhant Jogi 8 years, 3 months ago

CBSE > Class 11 > Chemistry

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Sanchit Varshney 8 years, 3 months ago

All the surroundings in which we live ie land , water,air is called environment

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What is Fajan's Rule?

Posted by Priyanshu Sharma 8 years, 3 months ago

CBSE > Class 11 > Chemistry

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How can we calculate molarity?

Posted by Yashvardhan Chauhan 8 years, 3 months ago

CBSE > Class 11 > Chemistry

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How do we draw hybridization diagram?

Posted by Sneha S 8 years, 3 months ago

CBSE > Class 11 > Chemistry

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When a drop of blue ink is put in water , the blue colour seperate and solution becomes blue. Name the phenomenon due to which this happens

Posted by Sudhir Brar 8 years, 3 months ago

CBSE > Class 11 > Chemistry

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Value of vander Waals constants a and b

Posted by Garima Rathee 8 years, 3 months ago

CBSE > Class 11 > Chemistry

1 answers

Vinay Verma 8 years, 3 months ago

Values of vander walls constants depend upon nature of gas

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Is there any specific formula for diamond?

Posted by Mohamed Rizwan 8 years, 3 months ago

CBSE > Class 11 > Chemistry

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Manju Pandey 8 years, 3 months ago

diamond is an allotrope of carbon. Its symbol is C

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Why metals are basis in nature

Posted by Sonu Ray 8 years, 3 months ago

CBSE > Class 11 > Chemistry

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Sahdev Sharma 8 years, 3 months ago

Metal oxides are basic in nature because they reacty with dil. acids to form salt and water. they also dissolve in water to form metal hydroxides which are alkaline in nature. these metal hydroxides release OH^- ions, so they are basic.

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what is the differenc between molecular mass and molar mass?

Posted by Aayush Raj Pandey 8 years, 3 months ago

CBSE > Class 11 > Chemistry

1 answers

Sahdev Sharma 8 years, 3 months ago

Molecular mass gives the mass of a single molecule (sum of the atomic masses in the molecule), whereas molar mass gives the average mass of the molecule (mass of Avogadro number of molecules).

– Therefore, the molecular mass of a molecule containing heavier isotopes can be few units higher than the molar mass.

– Otherwise, the value of the molar mass and molecular mass is quiet the same for a similar molecule; only the units are different. The unit of the molecular mass is amu, and the unit of the molar mass is gmol-1.

– It is accurate to use the molecular mass in calculations of higher amounts of molecules than using the molar mass.

– Molar mass is a measurement, which can be given to atoms, molecules or compounds. But molecular mass is only determined in the molecules. If it is the mass of an atom, a different terminology called atomic mass is used.

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Why need of classification

Posted by Anand Mishra 8 years, 3 months ago

CBSE > Class 11 > Chemistry

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Sanchit Varshney 8 years, 3 months ago

During the discovery of more and more elements it was very difficult to study the elements and to learn about the properties of elements so some scientists like Mandleev arrange the elements so there is a need of classification

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What is Rydberg formula

Posted by Vish Saini 8 years, 3 months ago

CBSE > Class 11 > Chemistry

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Effect of heat on blue vitrol?

Posted by Rohit Balmiki 8 years, 3 months ago

CBSE > Class 11 > Chemistry

2 answers

Sahdev Sharma 8 years, 3 months ago

Blue vitriol, as we know it, is hydrated Copper(II) Sulphate, meaning CuSO₄.5H₂O.

That 5H₂O is the water of crystallization or the water of hydration. Those 5 molecules of water simply constitute the crystal i.e, they are merely embedded in between CuSO₄ atoms.

When blue vitriol is heated, those water of crystallization escape out of the crystal and what's left is anhydrous copper sulphate or simply CuSO₄, without any water of crystallization.

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Rahul Poddar 8 years, 3 months ago

By heating blue vitriol the H2O molecules get remove from cuso4 due to this the blue colour fade and change into white

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What is inductive effect?

Posted by Abhishek Dubey 8 years, 3 months ago

CBSE > Class 11 > Chemistry

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Ky Ly 8 years, 3 months ago

An inductive effect is an electronic effect due to the polarisation of σ bonds within a molecule or ion. This is typically due to an electronegatvity difference between the atoms at either end of the bond.

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The reason,why scientist Hess discover the law i.e Hess law

Posted by Shivangi Rautela 8 years, 3 months ago

CBSE > Class 11 > Chemistry