CBSE > Class 12 > Chemistry | CBSE Board | Homework Help

As bond length increases, bond strength decreases. This is because the nuclei of the two atoms in the covalent bond are further apart, so there is a lower electrostatic force of attraction between the two nuclei and the shared pair of electrons between them. Bond length increases as the atomic radius of the atoms in the bond increases, and this increased bond length means that these molecules will react faster with other substances in chemical reactions as the bond enthalpy is lower so the bond is more easily broken (due to weaker intramolecular forces), therefore the substance is more reactive

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Diffrence between adsorption and absorption?

Posted by Raghav Dogra 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Nishi Sharma 7 years, 8 months ago

Adsorption simply means settle down of substance on surface but absorption is reaching inside surface

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What is anisotropic nature?

Posted by Divya Bharti 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Jashanpreet Singh Anand 7 years, 8 months ago

Change will not occur in all direction

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Why crystalline solid is called anisotropic

Posted by Sonam Kumari 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Taranvir Waraich 7 years, 8 months ago

Anisotropic is the property of substance due to which we got different values (of velocity,electrical conductivity etc.) in different directions. Thus crystalline solid show such property so they known so. THANKS

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Niobium crystallises in BCC structure.if density is 8.55g cm-³, calculate atomic radius of niobium having atomic mass 93u using log table.

Posted by Vaibhav Aggarwal 7 years, 8 months ago

CBSE > Class 12 > Chemistry

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Will the molarity of a solution at 50 c be same ,less or more than molarity at 25 c

Posted by Nishit Kumar 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Anshu Deo 7 years, 8 months ago

C here is degree celcius I guess if not correct me As volume Is directly proportional to temperature at cons pressure since if temperature increases volume increases and molarity decreases . (M=number of mole/volume )

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Arrange the following in increasing order of pH value. KNo3,CH3CooNa (aq),NH4Cl (aq),C6H5CooNH4(aq).?

Posted by Harsh Kumar 7 years, 8 months ago

CBSE > Class 12 > Chemistry

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What is void

Posted by Prateek Kumar 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Mansi Gupta 7 years, 8 months ago

Basically it's a kind of empty space

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What is isoelectric point

Posted by Mallikharjuna Kumar 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Jaya Shanti 7 years, 8 months ago

Is the pH at which a particular molecule carries no net electrical charge in the statistical mean. The standard nomenclature to represent the isoelectric point is pH(I), although pI is also commonly seen, and is used in this article for brevity.

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Why solid have definite volume and shape

Posted by Ajay Kumar Saw 7 years, 8 months ago

CBSE > Class 12 > Chemistry

2 answers

Nishi Sharma 7 years, 8 months ago

Simply there intermolecular forces are very strong thus have high m.p. nd b.p. so lattices are fixed

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Divyansh Pandey 7 years, 8 months ago

Because they have fixed and definite constituents particles on their fix positions. These particles only rotate on thir mean position but they can not change their position hence they have definite volume and shape.

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1)Write the possible isomers of monochloro derivatives of 2 3 dimethylbutane and write their IUPAC name ? 2) write structure and IUPAC names of possible isomers of C5H11BR and classify them as Primary secondary and tertiary ?(class 12th)

Posted by Omkar Holkar 7 years, 8 months ago

CBSE > Class 12 > Chemistry

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How many stereogenic Centre are present in firstly discovered antibiotics considered are equal to C H2H

Posted by Priyam Kumar 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Raj Naik 7 years, 8 months ago

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What is polyesters polymer?

Posted by Aditi S 7 years, 8 months ago

CBSE > Class 12 > Chemistry

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Plastic is a amorphous solid how?

Posted by Yogesh Patil 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Himanshu Jadaun 7 years, 8 months ago

Plastic is a amorphous solid because it's arrangement of atoms is irregular and it's melting point is quite low and it have a tendency to flow after giving a temp. So it shows the properties of amorphous solid........

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Window pAnes of old builiding turns milky why?

Posted by Anjali Kumari 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Divyansh Pandey 7 years, 8 months ago

This is because planes of building are made up of mirror and mirror is supercooled or pseudosolid which have tendency to flow hence panes is thick from bottom and turns milky.

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What is the difference between molarity and formality

Posted by Vaishnavi Verma 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Aman Chhillar 7 years, 8 months ago

Molarity is the concentration of a particular chemical species formality on the other hand is a substanc's total concentration without regard to its specific form

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A mineral having formula AB2 crystallises in CCP lattice with A atom occupying lattice points ,hence find the coordination number of A and B atoms.

Posted by Nikita Sneha 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Aman Chhillar 7 years, 8 months ago

?? A is not clear in the question

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vapour pressure of solution of solids in liquids

Posted by Angelina Priya 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Nishi Sharma 7 years, 8 months ago

Vapour pressure of solution decreases due to presence of solute's molecules thus less the solvent's molecule less the vapour pressure

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What is threshold frequency and work function of a metallic surface.?

Posted by Harsh Kumar 7 years, 8 months ago

CBSE > Class 12 > Chemistry

4 answers

Mohammed Sameer 7 years, 8 months ago

sorry google

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Mohammed Sameer 7 years, 8 months ago

search at goggle

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Harsh Kumar 7 years, 8 months ago

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Md Yasin 7 years, 8 months ago

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Numerical based on density

Posted by Nitin Shukla 7 years, 8 months ago

CBSE > Class 12 > Chemistry

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Element of atomic mass 40 occurs in fcc structure with the cell age of 540 picometre calculate the Avogadro number if density is 1.7 gram per centimetre cube

Posted by Nitin Shukla 7 years, 8 months ago

CBSE > Class 12 > Chemistry

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What is Henrys law

Posted by Uzma Bano 7 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Rishabh Sahu 7 years, 8 months ago

The mass of a gas dissolved in a given mass of a solvent at any temperature is proportional to the pressure of the gas above the solvent. This amount decreases with increase of temperature. { Given in class 11 the NCERT equilibrium under types of equilibrium.

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How many types of braiviss lattice are possible

Posted by Shreshtha Rastogi 7 years, 8 months ago

CBSE > Class 12 > Chemistry