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

According to the above equation, one mole of CH4 (16 g) on combustion gives one mole of carbon dioxide and 2 moles of water and 2 moles of water = 2 x [2 + 16] = 36 g of water.

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Why there is fixed no of electrons

Posted by Vivin Stark 6 years, 3 months ago

CBSE > Class 11 > Chemistry

1 answers

Sia ? 6 years, 3 months ago

According to Bohr, the amount of energy needed to move an electron from one zone to another is a fixed, finite amount. These zones are known as energy levels (or sometimes called electron shells). Each of these orbitals can hold 2 electrons, so a total of 8 electrons can be found at this level of energy.

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for the reaction NH4COONH2 solid giving to NH3 gas + seo2 gas the equilibrium pressure is 3 atmosphere KP for the reaction will be

Posted by Swetanjalee Priya 6 years, 3 months ago

CBSE > Class 11 > Chemistry

0 answers

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Define the mole

Posted by Rahul Mahato 6 years, 3 months ago

CBSE > Class 11 > Chemistry

1 answers

Yogita Ingle 6 years, 3 months ago

A mole is defined as the amount of a substance that contains exactly 6.02214076 * 10²³ ‘elementary entities’ of the given substance.

The number 6.02214076*10²³ is popularly known as the Avogadro constant and is often denoted by the symbol ‘N_A’. The elementary entities that can be represented in moles can be atoms, molecules, monoatomic/polyatomic ions, and other particles (such as electrons).

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Write vander waal's equation for one mol of a gas

Posted by Balram Rajput 6 years, 3 months ago

CBSE > Class 11 > Chemistry

1 answers

Yogita Ingle 6 years, 3 months ago

Generally Van- dar waal's equation is written ,
( P + an²/V²)( V - nb) = nRT

where , P is the pressure
V is the volume , n is the no of mole of gases R is universal gas constant , T is te the temperature ( in K)
. also a and b are constant .

For one mole Van dar waal's equation is
( P + a/V²)( V - b) = RT

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What is The most reactive element of halogen??

Posted by Rajeswari Muthukumar 6 years, 3 months ago

CBSE > Class 11 > Chemistry

2 answers

Somanvi Raj 6 years, 3 months ago

Flourine is the most reactive element in halogen family...

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Abhishek Chigareddy 6 years, 3 months ago

fluorine

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Explain why are helium molecule is not possible by help of molecular orbital theory

Posted by Subham Chamoli 6 years, 3 months ago

CBSE > Class 11 > Chemistry

2 answers

Abhishek Chigareddy 6 years, 3 months ago

noble gas

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Shivam Yadav 6 years, 3 months ago

Because bond order of he2 is 0

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Why molality is temperature independent???

Posted by Yash Satya 6 years, 3 months ago

CBSE > Class 11 > Chemistry

2 answers

Yogita Ingle 6 years, 3 months ago

Molality is the number of moles of solute per kilogram of solvent. it is denoted by "m".
A 1.0 m solution contains 1 mole of solute per kilogram of solvent. Unit of molality is moles/ kg. Molality of solution does not change with the temperature of solution. In case of molality it is ratio of moles to mass. Mass is the same at any temperature hence molality wont change with change in temperature.

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Jheel Tippan 6 years, 3 months ago

Because there is no change in mass of solvent in kg but in molarity volume of liquid gets changed

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Why are bohrs orbit called stationary orbit

Posted by Khushi Sharma 6 years, 3 months ago

CBSE > Class 11 > Chemistry

1 answers

Yash Satya 6 years, 3 months ago

Because electron does not gain or loose energy in their particular orbit that is energy of an electron ina orbit remains constant . that s why these are called stationary orbit.

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Methoxy methyl carbonation is more stable than propyl carbotion even through both are primary

Posted by Krishankant Chauhan 6 years, 3 months ago

CBSE > Class 11 > Chemistry

0 answers

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What is a formal charge ?

Posted by Rythm Tomar 6 years, 3 months ago

CBSE > Class 11 > Chemistry

1 answers

Richa Sharma 6 years, 3 months ago

The formal charge of an atom in a polyatomic ion or a molecule is defined as the difference between the number of valence electrons in an isolated and the number of electrons assigned to that atom in a Lewis structure . Formal charge =Total number of valence electrons in free atom - Total number of non bonding electrons - 1/2( Total number of bonding electrons)

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What is uncertainty ?

Posted by Neha Chauhan 6 years, 3 months ago

CBSE > Class 11 > Chemistry

1 answers

Shivam Kumar 6 years, 3 months ago

Uncertainty refers to epistemic situation involving imperfect or unknown information

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Define electrovalence of an element

Posted by Prayas Rasal 6 years, 3 months ago

CBSE > Class 11 > Chemistry

1 answers

Richa Sharma 6 years, 3 months ago

The number of electrons lost or gained by an atom in the formation of electrovalent bond is called its electrovalence .

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Can anyone define the molecular orbital theory

Posted by Shivendra Pandey 6 years, 3 months ago

CBSE > Class 11 > Chemistry

1 answers

Shivendra Pandey 6 years, 3 months ago

The Hund& mnilitan defined the a.o.'s mixed to produce molicular orbitals of different energy.

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Difference between isotopes and isobars

Posted by Reena Tayade 6 years, 3 months ago

CBSE > Class 11 > Chemistry

4 answers

Khushi Rajput 6 years, 3 months ago

Sach atoms of same elements having same atomic number but different mass number is called isotopes and such atoms of different elements which have same mass number and different atomic number is called isobar

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Shruti Rai 6 years, 3 months ago

Atoms of same elements having different atomic masses called isotopes. Atoms of different elements habing same aromic masses called isobars.

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Shivendra Pandey 6 years, 3 months ago

Two elements having same mass numbers but different atomic numbers called isobars. Two elements having identical atomic numbers but different atomic mass called isotopes

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Bhaskar Borah 6 years, 3 months ago

Isobars are the atoms with same mass number but different atomic number. And on the other hand Atoms with identical atomic number but different atomic mass are called isotopes.

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