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

It arises due to the anion vacancy in a Crystal or extra metal occupying lattice sites or interstitial sites in the crystal. Anion vacancy: when alkali metal halide crystals are heated in the atmosphere of that alkali metal vapours the excess of alkali metal atoms are deposited on the suface of the crystal and then the halide ions diffuse to the surface of the crystal and combine with the alkali metal atom and inturn leave its valance electron in its lattice site, which is then responsible for imparting colours by the crystal. Since the anion leave the Crystal, there is deficiency of anion and excess of cation however the crystal remains electrically neutral. Excess cation occupying interstitial sites: the non- metal atoms leave the sites leaving the electrons behind in the interstitial sites and the metal atoms bind to it remains in the lattice but in the interstitial sites making the crystal rich in cations . However the crystal remains electrically neutral.

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What is photovoltaic?

Posted by Deepanshu Jaiswal 7 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Varun Chauhan 7 years, 7 months ago

It is a solar panel which converts light directly into electricity

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Is cimetidine an appropriate medicine for nasal congestion ?

Posted by Aryan Singh 7 years, 7 months ago

CBSE > Class 12 > Chemistry

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Why AgBr is present in both defects that is frenkel defect & schottky defect ?

Posted by Tannya Pande 7 years, 7 months ago

CBSE > Class 12 > Chemistry

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Explain how much portion of an atom located 1corner 2body centred of a cubic unit is part of its neighbouring unit cell

Posted by Vaishnav Bhole 7 years, 7 months ago

CBSE > Class 12 > Chemistry

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2M aqueous urea have density 1,2 g/cc calculate W/W%

Posted by Vikas Sharma 7 years, 7 months ago

CBSE > Class 12 > Chemistry

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How many grams of chlorine can be produced by the electrolysis of matters NaCl with a current of 1.02A for 15min ?

Posted by Tannya Pande 7 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Devang Desai 7 years, 7 months ago

Mass produced=Zit =molarmass of NaCl/nFmultiply i(current) t(time in seconds)

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Gelatin is added to ice cream . Why ?

Posted by Sagar Sinha 7 years, 7 months ago

CBSE > Class 12 > Chemistry

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Utkarsha Nayak 7 years, 7 months ago

1. To give a soft texture 2. To give a fresh appearance 3. To absorb water 4. To prevent formation of large crystals.

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Gelatin is added to ice cream . why?

Posted by Tannya Pande 7 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Utkarsha Nayak 7 years, 7 months ago

Gelatin is used in ice cream to give it a soft texture and fresh appearance. Gelatin absorbs free water in the ice cream and prevent the formation of large crystals.

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the vapour pressure of water is 12.4 kpa at 300 k . calculate the vapour of 1 molal solution of non volatile solute in it.

Posted by Anurag Miyan 7 years, 7 months ago

CBSE > Class 12 > Chemistry

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If i read only ncert for cbse board exam then i will get good marks or not

Posted by Romaan Mansoor 7 years, 7 months ago

CBSE > Class 12 > Chemistry

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Utkarsha Nayak 7 years, 7 months ago

Yes for sure, but not for physics & maths

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Shubham Bhatt 7 years, 7 months ago

Better than good marks you focus on gaining good knowledge from your books because good knowledge is more beneficial than good marks and if you have good knowledge than surely you will get good marks

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Tannya Pande 7 years, 7 months ago

Yes of course , read thoroughly from ncert ? .

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Dharshika As 7 years, 7 months ago

U will surely get good marks but..u should understand the meaning each and every line in detail very clearly

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Sir plz send solution of chemistry intex questions

Posted by Tarkeshwar Yadav 5 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Rohit Yadav 7 years, 7 months ago

.....

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What is notarity

Posted by Veena Sharma 5 years, 8 months ago

CBSE > Class 12 > Chemistry

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degree of hardness

Posted by Amit Kumar 7 years, 7 months ago

CBSE > Class 12 > Chemistry

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log(1.23)1.5/11.2×23.5

Posted by Lucky Gupta 5 years, 8 months ago

CBSE > Class 12 > Chemistry

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Parminder Kaur 7 years, 7 months ago

2.1552

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What is vont hoff's factor(i)?

Posted by Shivam Mishra 7 years, 7 months ago

CBSE > Class 12 > Chemistry

2 answers

Ritik Ranjan 7 years, 7 months ago

It is the no.of atoms after dissociation or association upon no. Of atoms before dissociation or association .

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Aman Yadav 7 years, 7 months ago

It is defined as: Calculated colligative per total colligative property

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Why on heating LiCl turns to pink?

Posted by Vishu Rana 7 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Tannya Pande 7 years, 7 months ago

The color results by excitation of these electrons when they absorb energy from the visible light falling on the crystals . so excess of lithium makes LiCl crystals pink .

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Why defect in solid is also known as thermodynamic defect. (JEE MAINS 2016)

Posted by Yo Yo Honey Singh ? 7 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Tannya Pande 7 years, 7 months ago

Because the number of defects depends on the temperature .

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Assuming the complete dissociation of a salt calculate the molality of NaCl solution whose elevation of boiling point is numerically equal to depression of freezing point of 0.2 M of aluminium sulphate solution in H2O. Kb = 0.52 Kf = 1.86 K Kg / mol

Posted by Udisha Singh 7 years, 7 months ago

CBSE > Class 12 > Chemistry

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Prove that carbonyl group is present as an aldehydic group in glucose?

Posted by Anmol Sharma 7 years, 7 months ago

CBSE > Class 12 > Chemistry

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What happens when2,4,6 trinitrochlorobenzene is subjected to hydrolysis

Posted by Jhilik Pal 7 years, 7 months ago

CBSE > Class 12 > Chemistry

1 answers

Logan Wolverine 7 years, 7 months ago

2,4,6-Trinitrophenol is formed when treated with warm water

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2,4,6 trinitrochlorobenzene is subjected to hydrolysis .what happen

Posted by Jhilik Pal 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Dhmi Bhatti 5 years, 3 months ago

ghk

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Difference between potential difference & e.m.f .

Posted by Tannya Pande 4 years, 6 months ago

CBSE > Class 12 > Chemistry

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Sia ? 4 years, 6 months ago

Key Differences between Electromotive Force and Potential Difference.

The electromotive force is the measure of energy that it gives to each coulomb of charge, whereas the potential difference is the amount of energy used by the one coulomb of charge.
The electromotive force is represented by the symbol ε whereas the symbol V represents the potential difference.
The electromotive force does not depend on the internal resistance of the circuit whereas the potential difference is directly proportional to the resistance of the circuit.
The electromotive force transfers the energy in the whole of the circuit. The potential difference is the measure of energy between any two points on the circuit.
The magnitude of the electromotive force is always greater than the potential difference when the circuit is unchanged but when the circuit is fully charged the magnitude of the potential difference is equal to the emf of the circuit.
The magnitude of emf has always remained constant, whereas the magnitude of the potential difference varies.
The electromotive force is the cause of the potential difference, whereas the potential difference is the effect of the potential difference.
The emf force exists in the circuit even when the current does not flow in the circuit whereas the potential difference does not exist in the circuit when the magnitude of current remain zero.
The EMF is the maximum voltage that the battery can deliver whereas the magnitude of the potential difference is always less than the maximum possible value of emf.
The emf force gains the electrical energy in the circuit whereas the potential difference loss the electrical energy in the circuit.
The electromotive force is induced in the electric, magnetic and gravitational field, whereas the potential difference is generated only in an electric field.
The emf meter is used for measuring the electromotive force, whereas the voltmeter is used for measuring the potential difference.