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

The significance of lattice point . →a) each point in lattice is called lattice point or lattice side . b)each point in a crystal lattice represents one constituent particle which may be an atom or a molecule or a ion.. c)every lattice point has identical surrounding except those which are on the surface or corners of crystal d)if a line drown by line joining two lattice points, it would pass through a series of similar points at regular intervals. d)lattice points arejoined by straight lines to bring out the geometry of the lattice.these lines do not represent the chemistry bond.

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Mohit Mehra 5 years, 3 months ago

Hello y

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Mohit Mehra 5 years, 3 months ago

Hello

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Shraddha ✨ 5 years, 3 months ago

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Hello friends how are you all

Posted by Vikram Sihag 5 years, 3 months ago

CBSE > Class 12 > Chemistry

3 answers

Siddhi Singh 5 years, 3 months ago

Stupid question is not asked here

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Mishti ???? 5 years, 3 months ago

Please dear don't ask such type of questions which is irrelevant to our academic queries otherwise u will blocked by this app for 30 days.... Hope u understand dear... Regards.. ??

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Prisha Rathore 5 years, 3 months ago

Fine. What about u

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The melting points and soliability In water of amino acids are generally higher than that of the corresponding halo acids. Explain

Posted by Mohamed Saajid 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 5 years, 3 months ago

Both acidic (carboxyl) as well as basic (amino) groups are present in the same molecule of amino acids. In aqueous solutions, the carboxyl group can lose a proton and the amino group can accept a proton, thus giving rise to a dipolar ion known as a zwitter ion.

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Iupan names

Posted by Naveen Kalish 5 years, 3 months ago

CBSE > Class 12 > Chemistry

3 answers

Dhruv Singh Rajpoot 5 years, 3 months ago

Haloalkene

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Preeti Yadav 5 years, 3 months ago

Kiske IUPAC names

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... Yang ... 5 years, 3 months ago

Do uh mean “IUPAC”?

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ANSWER

Fe©3 + so®2

Posted by Aryan Porwal 5 years, 3 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

why is pcl3 is more stable than pcl5

Posted by Lokesh Yadav 5 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Iqbal Singh 5 years, 3 months ago

Becoz of structure and having more electrons.

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Saad Khan 5 years, 3 months ago

PCl3 is more stable than PCl5 because PCl5 has steric crowding(triagonal bipyramidal shape and sp3d2 hybridisation) than PCl3(triagonal planar structure and sp3 hybridisation

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ANSWER

What is the difference between in amorphous and crystalline

Posted by Vishant Sahu 5 years, 3 months ago

CBSE > Class 12 > Chemistry

3 answers

Shaina Choudhary 5 years, 3 months ago

1. Crystalline solids are the constituent particles which have regular arrangement whereas Amorphous solids are those which do not have regular arrangement. 2. Crystalline solids have long range order whereas Amorphous solids have short range order. 3. Crystalline solids have sharp melting point whereas Amorphous solids melt over a wide range of temperature. 4. Crystalline solids are anisotropic (substances having different properties and different values in different directions). Where as Amorphous solids are isotropic.

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Yogita Ingle 5 years, 3 months ago

Crystals have an orderly arrangement of their constituent particles. In comparison, amorphous solids have no such arrangement. Their particles are randomly organised.
Crystals have a specific geometric shape with definite edges. Amorphous solids have no geometry in their shapes
Crystalline solids have a sharp melting point on which they will definitely melt. An amorphous solid will have a range of temperature over which it will melt, but no definite temperature as such
Crystals have a long order arrangement of their particles. This means the particles will show the same arrangement indefinitely. Amorphous solids have a short order arrangement. Their particles show a lot of variety in their arrangement.

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Palak Sahu 5 years, 3 months ago

Crystalline solid are arrange in regular way but amphorphus solid are arrange in irregular way

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CH3_CH2_CH2_CH2_BR+CN_

Posted by Nishant Chaudhary 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Tannu Rao 5 years, 3 months ago

CH3-CH2-CH2-CH2-CN (Sn2 reaction)

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ANSWER

What you mean by solutions

Posted by Arjun Narayan 5 years, 3 months ago

CBSE > Class 12 > Chemistry

4 answers

@Kanishka Panu 5 years, 3 months ago

Ans: Solution is the mixture of two or more than two components. Hope the answer here helps you. Thankyou.

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ஸ்ரீ ஹாரி Sreehari. M 5 years, 3 months ago

Hetrogeneous

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Saman Zehra 5 years, 3 months ago

Solutions is any mixture in which we can add any substance There are two types of solution 1.homogeneous solution 2.hetrogeneous solution

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Yogita Ingle 5 years, 3 months ago

Solutions can be broadly categorized into two types:

Homogeneous solutions: Solutions with uniform composition and properties throughout the solution are known as homogenous solution. E.g. solution of salt or sugar in water, cough syrup, cup of coffee, Mouthwash, perfume are homogeneous mixture of chemicals and dyes, etc.

Homogenous solution of salt dissolved in water (left), a cup of coffee (right)

Heterogeneous solutions: Solutions with non-uniform composition and properties throughout the solution are known as heterogeneous solution. E.g. solution of water and sand, solution of oil and water, water and chalk powder, etc.

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What are the applications of Adsorption?

Posted by Aditi Sharma 5 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Yangzee Sherpa 5 years, 3 months ago

Applications Of Adsorption: 1) For production of high vacuum. 2) Gas masks containing activated charcoal is used for breathing in coalmines. They adsorb poisonous gases. 3) Silica & Aluminium gels are used as adsorbents for controlling humidity. 4) Removal of colouring matter from solutions. 5) It is used in heterogeneous catalysis. HoPe It HeLpS yOu??

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Gaurav Seth 5 years, 3 months ago

1) In gas masks:

Activated charcoal or a mixture of adsorbents is generally used in gas masks to adsorb poisonous and toxic gases from air.

These masks are commonly used by the miners because there are poisonous gases like CO, CH₄ etc. in the atmosphere in the coal mines. Therefore, these masks help to purify the air for breathing.

2) In dyeing of cloth:

Mordants such as alums are used in dyeing of cloth.They adsorb the dye particles which, otherwise, do not stick to the cloth.

3) In Dehumidizers for control of humidity:

Silica and aluminium gels are commonly used to adsorb humidity or moisture from air.

4) Removal of colouring matter from solutions:

Many substances such sugar, juice and vegetable oils are coloured due to the presence of impurities.They can be decolourised by placing in contact with adsorbents like activated charcoal or fuller’s earth. This method is used in the manufacture of cane sugar.

5) Heterogeneous catalysis:

Adsorption of reactants on the solid surface of catalysts increases the rate of reaction. The metals such as Fe, Ni, Pt, Pd, etc, are used in the manufacturing process.

Manufacture of ammonia using iron as catalyst (Haber process), manufacture of sulphuric acid by contact process and use of finely divided nickel in the hydrogenation of oils are excellent examples of heterogeneous catalysis.

6) In ion-exchange resins:

The organic polymers containing groups like – COOH,- SO₃H and- NH₂, etc. possess the property of selective adsorption of ions from solutions. These are quite useful in the softening of water.

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What is the second trick to solve SN2 reaction?

Posted by Riya Kavathe 5 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Riya Kavathe 5 years, 3 months ago

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Devil ? 5 years, 3 months ago

Take place in 1 step

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Anyone please send me the name of ideal solutions in chemistry.

Posted by Rohan Chaudhary ??? 5 years, 3 months ago

CBSE > Class 12 > Chemistry

3 answers

Rohan Chaudhary ??? 5 years, 3 months ago

Thank you khushi

1Thank You

Rohan Chaudhary ??? 5 years, 3 months ago

But on earth there is no solution is 100% ideal

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Khushi Shahi 5 years, 3 months ago

Toluene and Benzene. Ethyl Iodide and Ethyl Bromide. Bromobenzene and Chlorobenzene. N-heptane and n-hexane

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ANSWER

Please anyone send me syllabus for board exams 2020-21

Posted by Rohan Chaudhary ??? 5 years, 3 months ago

CBSE > Class 12 > Chemistry

4 answers

Devil ? 5 years, 3 months ago

?? itna yadha khud hii type hoo gya without any mistake

2Thank You

Rohan Chaudhary ??? 5 years, 3 months ago

Sorry brother but this is not my problem this type by mistake my phone display is break. But now this is repaired

1Thank You

Ankit Prasad 5 years, 3 months ago

Copy & search in google

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Ankit Prasad 5 years, 3 months ago

https://www-indiatoday-in.cdn.ampproject.org/v/s/www.indiatoday.in/amp/education-today/news/story/cbse-syllabus-reduced-by-30-check-deleted-syllabus-of-cbse-class-12-1698089-2020-07-07?usqp=mq331AQQKAGYAdW47fy3tZHLK7ABIA%3D%3D&amp_js_v=a2&amp_gsa=1#referrer=https%3A%2F%2Fwww.google.com&ampshare=https%3A%2F%2Fwww.indiatoday.in%2Feducation-today%2Fnews%2Fstory%2Fcbse-syllabus-reduced-by-30-check-deleted-syllabus-of-cbse-class-12-1698089-2020-07-07

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In chromium (lll) chloride CrCl3,chloride ions have cubic close packed arrangement and Cr(lll) ions are present in the octahedral holes. What fraction of the octahedral holes is occupied? What fraction of total no. Of holes is occupied?

Posted by Nisa Saini 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Nishant Pandey 5 years, 3 months ago

Fraction of octahedral (holes) voids-1/3 & Fraction of total no.voids(holes) - 1/9

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ANSWER

CH3 -CH3 -C |. OH.

Posted by Ashish Yadav 5 years, 3 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Can I take admission in college before passing compartment exam

Posted by Hritik Kaushik 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Itzz Aayu 5 years, 3 months ago

no you cant get admission in govt.. colleges. if u do that u may face trouble in your future . you should first clear your compartment exam . after that u can get admission in any college as per your interest.

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distinguish test between ethanol and methanol

Posted by Apurva Phulari 5 years, 3 months ago

CBSE > Class 12 > Chemistry

4 answers

Rohan Chaudhary ??? 5 years, 3 months ago

Please send chemistry syllabus for 2020-21 exam

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Rohan Chaudhary ??? 5 years, 3 months ago

Methanol composed of only one carbon atom while ethanol consist of two carbon atom.

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Rohan Chaudhary ??? 5 years, 3 months ago

Correct

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Yogita Ingle 5 years, 3 months ago

Methanol and ethanol are distinguished by a type of test known as Iodoform. When ethanol is warmed with iodine in the presence of NaOH, it forms a yellow colored precipitate but methanol do not react positively to Iodoform test.

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What is the chlej

Posted by Sumandeep Kaur 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Khushi Shahi 5 years, 3 months ago

Chlej is mainly to down a drink. Almost informal- to drink in a less than polite or proper way.

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Hllw frds. How much syllabus u all have completed ?? ??

Posted by Devil ? 5 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Manvi Munpariya 5 years, 3 months ago

Up to 7 chapter

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Baso Lal 5 years, 3 months ago

Half

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Explain molar conductivity

Posted by Harman Preet 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Shweta? Dhama? 5 years, 3 months ago

The molar conductivity of an electrolyte solution is defined as its conductivity divided by its molar concentration.. ^m=k/c SI unit of molar conductivity is Siemens metre-squared per mole (S m2 mol−1)...hope it helps u...☺

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Theory of preparation of Mohr salt

Posted by Anish Fatma 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Pratibha Sahu◝(⑅•ᴗ•⑅)◜..°♡ 5 years, 3 months ago

It is prepared by dissolving an equimolar mixture of hydrated ferrous sulphate and ammonium sulphate in water containing a little sulphuric acid and then subjecting the resulting solution to crystallisation. Ferrous ammonium sulphate forms light green crystala.

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ANSWER

Atomic radius of Zn greater than copper

Posted by Richa Gandhi 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Pratibha Sahu◝(⑅•ᴗ•⑅)◜..°♡ 5 years, 3 months ago

Yes it is greater in zinc all the 10d electrons are available which provide very large screening effect of nuclear charge on the electrons which results in repulsion in the electrons of zinc which ultimately lead to large atomic radius.

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What is a hybridization?

Posted by Sanyog Kumar 5 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Yangzee Sherpa 5 years, 3 months ago

HYBRIDIZATION is the mixing or merging of dissimilar orbitals of similar energies to form new orbitals. HoPe It HeLpS yOu??

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Yogita Ingle 5 years, 3 months ago

The mixing or merging of dissimilar orbitals of similar energies to form new orbitals is known as hybridization and the new orbitals formed are known as hybrid orbitals.

Orbitals belonging to the same atom or ion having similar energies get hybridized.
Number of hybrid orbitals is equal to the no. of orbitals taking part in hybridization.
The hybrid orbitals are always equivalent in energy and shape.
The hybrid orbitals form more stable bond than the pure atom orbital.
The reason hybridization takes place is to produce equivalent orbitals which give maximum symmetry.

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ANSWER

Why tungsten has high melting point

Posted by Harshit Upadhyay 5 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Nishant Pandey 5 years, 3 months ago

Because Tungsten has strong covalent bond b/w its atoms

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0.2 molarity 100ml HNO3 solution is diluted with 100ml of water find the molarity of the solution

Posted by Rahul Raj 5 years, 3 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

100ml of liquid A and 25 ml of liquid B are mixed to form a solution of volume 125 ml. Then the solution is.................

Posted by Akila Momin 5 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Dheeraj Singh 5 years, 3 months ago

125ml

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Worksheet for class 12

Posted by Chandnani Haresh 5 years, 4 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

How to find mole fraction???

Posted by Akila Momin 5 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 5 years, 4 months ago

Mole fraction can be defined as the ratio of number of moles of the component in the solution to the total number of moles of all components in the solution.
It is denoted by the alphabet x and subscript written on the right hand side of x denotes the component of which mole fraction is being calculated.
Mathematically, Mole fraction of a component = Number of moles of the component/ total number of moles of all components

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