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

Octahedral voids -such voids are formed where triangular voids of second layer covers the triangular voids of first layer but apex of each is in opposite direction

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Amrita Thakur 4 years ago

Tetrahedral voids- such voids are formed when a sphere of second layer covers the voids of first layer

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What.do.you.mean.by.surface.chemistry

Posted by Sachin Chandela 4 years ago

CBSE > Class 12 > Chemistry

1 answers

Suraj Kumar 4 years ago

Chemical phenomena that occurs at interface of two surfaces.

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Short note on electro chemistry

Posted by Alfaz Siddiqui 4 years ago

CBSE > Class 12 > Chemistry

1 answers

Mk 10 4 years ago

Electrochemistry is the process of production of electricity from the energy released during spontaneous chemical reactions (or) using electrical energy to undergo a non-spontaneous reactions.

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What is solvation effect? Out of SN1 and SN2 which have solvation effect?

Posted by Anisha Kabsuri 4 years ago

CBSE > Class 12 > Chemistry

1 answers

Sia ? 3 years, 6 months ago

SN1 • Polar solvent stabilizes transition state and carbocation intermediate. group. SN2 • Need polar solvent to dissolve nucleophile. Protic solvent slows rate by solvating nucleophile • Aprotic solvent increases rate by binding cation and thus freeing nucleophile.

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What is the difference between Wurtz-Fittig reaction and Fittig reaction,?????

Posted by Kirti Sharma? 4 years ago

CBSE > Class 12 > Chemistry

4 answers

Gourav Sharma 4 years ago

Dekho both easy h thoda sa socho aur answer mil jaye ga

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Himesh Rawat 4 years ago

Ncert Book mai saaf saaf de rkha hai proper way mai

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Yogita Ingle 4 years ago

Wurtz - Fitting reaction:
Aryl halide and alkyl halide couple in presence of sodium metal / dry ether to form alkyl benzene.
For example, bromobenzene reacts with methyl bromide in presence of sodium. dry ether to form toluene.
C₆H₅−Br+CH₃−Br+2Na → dryether C₆H₅−CH₃+2NaBr

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Bhawna Chaudhary 4 years ago

The basic diff. Is that in wurtz fittig rxn alkyl halide and aryl halide combine but in Fitting rxn both the compound which react are aromatic halide

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Write the nerst equation for the electrode reaction: Mn+ne -M(s)

Posted by Ngachanyo Ps 4 years ago

CBSE > Class 12 > Chemistry

0 answers

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Propene to propan_1_ol

Posted by Vikas Payla 4 years ago

CBSE > Class 12 > Chemistry

1 answers

Sanjana Dua?????❣️ 4 years ago

Propene + HBr forms Ch3ch2ch2 -Br inthe presence of peroxide and Ch3ch2ch2-Br heat with KOH gives rise to Ch3ch2ch2OH Hope it's help u ??

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What are ambientate ligands

Posted by Vansh Prajapati 4 years ago

CBSE > Class 12 > Chemistry

2 answers

Yogita Ingle 4 years ago

A ligand is an ion or molecule, which donates a pair of electrons to the central metal atom or ion to form a coordination complex. Ambidentate ligand is a type of ligands which have the ability to bind to the central atom via the atoms of two different elements.

Examples: thiocyanate ion(NCS^–) which can bind to the central metal atom or ion with either nitrogen or sulfur atoms.

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Krishna Vaishist 4 years ago

If a ligand has more than 1donating site like in CN the bond can be formed from either C or N atom .so is the ambientate ligand.

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What are the applications of van't Hoff factor

Posted by Abhi Thakur 4 years ago

CBSE > Class 12 > Chemistry

2 answers

Jassi Midha 3 years, 11 months ago

Deleted from syllabus

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Kaushal Kumar Gupta 4 years ago

To find abnormal molar mass of a compound

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Practicals???

Posted by Ishan Sharma 4 years ago

CBSE > Class 12 > Chemistry

2 answers

Devil ? 4 years ago

Tentative dates aa gyi h

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Kaushal Kumar Gupta 4 years ago

Hamara bhi abhi nahi huaa hai bahi

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वाण्ट हाफ गुणांक से क्या अभिपाय है

Posted by Vandana Patel Vandana 4 years ago

CBSE > Class 12 > Chemistry

0 answers

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Why nitrogen cannot exhibit +5 oxidation state?

Posted by Muthu Kamatchi 4 years ago

CBSE > Class 12 > Chemistry

3 answers

Aditya Singh 4 years ago

Due to absence of vacant d orbitals

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Vansh Prajapati 4 years ago

Due to the absence of d orbital

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Yogita Ingle 4 years ago

Nitrogen with n = 2 has s and p orbitals only. If does not have d orbitals to expand its valence shell. That is why it does not form pentahalide.

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Trick to determine Electron Withdrawing group and Electron Donating groups?

Posted by Sneha Panwar 4 years ago

CBSE > Class 12 > Chemistry

1 answers

Bhawna Chaudhary 4 years ago

Those milecules/elements who have lone pair are electron donating grps. Alkyl are always electron donating .You can simply identify them in alliphatic molecules but the confusion arise in aromatic compound for example halogens are normally electron withdrawing but when connected in aromatic compound it act as electron donating. You can clear your confusion by just remembering 2 things:- 1. Halogens connected in aromatic compound are always E.D.G 2.any compound like (OCH3) in which Oxygen is more negative than carbon. If it is connected to ar.compound from Oxygen side (more -ve) than it will act as E.D.G as bcz carbon will try to repell the electrons.but if it is cnnctd through Carbon (less -ve) it will act as E.W.G bcz oxygen is nt directly connected to ar.ring so it will try to attract electrons Hope it will help 2 clear your confusion and remembering E.W.G and E.D.G

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Lenz's Law describe.

Posted by Mr. Singh 4 years ago

CBSE > Class 12 > Chemistry

1 answers

Rohit Kushwaha 4 years ago

Induced emf is directly proportional to rate of change of flux But induced emf is always in opposite directions e = - d(flux)/dt

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List out the real life examples for adsorption

Posted by Namitha Navaneeth Mk 4 years ago

CBSE > Class 12 > Chemistry

3 answers

All Rounder Mkjha 4 years ago

Silica gel

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Aayush Singh 4 years ago

Corrosion

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Vedansh Sharma 4 years ago

Oil n water

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Convert-:benzoic acid to benzamide

Posted by Vishal Khandelwal 4 years ago

CBSE > Class 12 > Chemistry

2 answers

Krishna Vaishist 4 years ago

With NH3 benzoic acid is converted to benzamide.

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Yogita Ingle 4 years ago

Benzoicacid reacts with NH3 to form ammoniumsalt which on heating decomposes to form benzamide
Ph−COOH+NH₃⇌ Ph−COONH₄+ΔPhCONH₂+H₂O

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Convert-:aniline to benzene

Posted by Vishal Khandelwal 4 years ago

CBSE > Class 12 > Chemistry

1 answers

Mr. Singh 4 years ago

Aniline to benzene through phenol has only two steps. First, Aniline reacts with nitrous acid in room temperature. It gives phenol. Then phenol is distilled with zinc powder to give benzene.

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Convert-:benzene to benzoic acid

Posted by Vishal Khandelwal 4 years ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 4 years ago

Convert benzene to methyl benzene by reacting it with CH₃Cl and anhydrous AlCl₃. Oxidize methyl benzene with a powerful oxidizing agent like alkaline KMnO₄ we will get benzoic acid.

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Convert-: aniline to toluene

Posted by Vishal Khandelwal 4 years ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 4 years ago

Aniline is treated with sodium nitrite in Hydro-chloric acid at temperature 423K to form benzene diazonium chloride followed by hydrolysis by weak acid benzene .

Benzene is treated with aluminium chloride to form toulene.

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Convert ethyl bromide to propanol

Posted by Vishal Khandelwal 4 years ago

CBSE > Class 12 > Chemistry

2 answers

Aditya Singh 4 years ago

By passing aq koh

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Bhawna Chaudhary 4 years ago

treat ethyl bromide with KCN it will form propanenitrile. add H2O in acidic med. it will become propanoic acid and now u can simply reduce propanoic acid it will form propanol

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Why does not the initial supply of heat act as a activation energy in physical adsorption ?

Posted by Vaishali Dahiya 4 years ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 4 years ago

Chemisorption involves high activation energy. So, first, it increases and then decreases with increase in temperature. The initial increase is due to the heat supplied which act as activation energy required for chemisorption. But later it decreases due to the exothermic nature of adsorption at equilibrium.

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Which of the following is not affected by temperature? 1) Normality, 2)molarity, 3) molality, 4) all of the above

Posted by Anmol Kaur 4 years ago

CBSE > Class 12 > Chemistry

5 answers

Rajalakshmi Subramanian 4 years ago

It's Molality. As it does not depend on temp.it is the best method to calculate concentration when compare to Molarity

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Diya Bolia 4 years ago

I think Molality ??

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Apoorv Sharma Sharma 4 years ago

Molality

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Yogita Ingle 4 years ago

Molarity is given by M=n_solute/V_solution here V is the volume of the solution which is temperature dependent.

Molality is given by m=n_solute/W_solution W_solvent is the mass of solvent which is independent of temperature.

Normality is given by N=n_equivalent _solute/V_solution

Here, it is dependent on volume which is temperature dependent.

Mole fraction is dependent on the amount of substance which is temperature independent.

Therefore, Molality and mole fraction are temperature independent.

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Tanya ?? 4 years ago

I think Molality ??

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Explain cumene's process.

Posted by Sneha Kakadiya 4 years ago

CBSE > Class 12 > Chemistry

1 answers

Sanjana Dua?????❣️ 4 years ago

It is a industrial process for synthesizing phenol and acetone from benzene and propylene. The term stem cumene(isopropyl benzene) intermediate material during this process. Hope it's help u ?

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Sulfur forms SF6 but oxygen does not form O6. Why?

Posted by All Rounder Mkjha 4 years ago

CBSE > Class 12 > Chemistry

5 answers

Rajalakshmi Subramanian 4 years ago

Because of the absence of d orbital, it cannot extend its covalency

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Piyush Gupta 4 years ago

Due to absence of d- orbital

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Sneha Kakadiya 4 years ago

SF6 exists but OF6 does not because the difference of electronegativity is less between oxygen and fluorine.

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Tanya ?? 4 years ago

Because of the difference in their electronegativity...and also oxygen don't have enough orbitals but sulphur has 3d so, sulphur can use 3d orbitals..

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Rounak Kumar 4 years ago

Because....

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1) An element X with atomic mass 40 U has fcc structure with edge length of 400 pm. Calculate the density of X and the number of unit cells in 4g of X? 2) Niobium crystallises in bcc structure. If the density is 8.55g/cc, calculate the atomic radius of Niobium if it's atomic mass is 93 U?

Posted by Nantha S Kumar 4 years ago

CBSE > Class 12 > Chemistry

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1) In a ccp lattice made up Y anions, all the tetrahedral voids are occupied by X cation. Predict the formula of solid? 2) A compound has X atoms at alternate faces and Y atoms at corner of cube. What is the formula of the compound? 3) What is the radius of sodium atom if it crystallices in bcc structure with the cell edge of 400 pm?

Posted by Nantha S Kumar 4 years ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What are higher haloalkanes and lower haloalkanes?

Posted by Raksha Yaduwanshi 4 years ago

CBSE > Class 12 > Chemistry

2 answers

Rajalakshmi Subramanian 4 years ago

Higher halo alkanes means number of carbon atoms will be more. Lower means number of carbon atoms are less.

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Sneha Kakadiya 4 years ago

Haloalkanes are generally colourless and odorless compounds. They are hydrophobic in nature. Boiling point – Boiling point of haloalkanes is higher than alkanes if the number of carbon atoms are same in both. ... As the branching increases, boiling points of isomeric haloalkanes decrease.

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Why do solid have a definite volume

Posted by Angki Modi 4 years ago

CBSE > Class 12 > Chemistry

2 answers

Tanya ?? 4 years ago

Bcoz of strong intermolecular forces of attraction between them.

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Sarkeerat Dhammu 4 years ago

Cauz particles are so tightly packed, which left very very less interstitial spaces or free spaces inside that volume,, thus due to negligible movement of particle,,, we get a rigid structure,, thus a definite volume

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Name a salt which is added to AgCl to produce cationic vacancies?

Posted by Nantha S Kumar 4 years ago

CBSE > Class 12 > Chemistry