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

Due to greater ability of ion to donate e- to the benzene ring, phenoxide ion is more reactive than phenol towards electrophilic aromatic substitution reactions.

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Agcl is doped with 10 raised to the power -2 mol% of cdcl2.find the concentration of cation vaccancy

Posted by Avvvg Derd 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Pranjal Nishad 4 years, 6 months ago

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2.9

Posted by Smrit Mishra 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Deepti Choudhary 7 years ago

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What types of solid are electrical conductors malleable or ductile

Posted by Satish Kumar 7 years ago

CBSE > Class 12 > Chemistry

4 answers

Dinky Jangra 7 years ago

Metallic solid

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Deepti Choudhary 7 years ago

Metallic solids are electrical conductors, malleable, and ductile.They consists of an assemblage of positive ions(kernels) immersed in a ‘sea’ of mobile electrons.Thus, each electron belongs to a number of positive ions & each positive ion belongs to a number of electronsThe force that binds a metal ion to a number of electrons within its sphere of influence is known as metallic bond.This force of attraction is sufficiently strong & is thus responsible for compact solid structure of metals & therefore these solids are good conductors,malleable & ductile in nature.For eg metals like copper, nickel etc.

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Priyanshu Kumar 7 years ago

Metallic solids are electrical conductors, malleable, and ductile.They consists of an assemblage of positive ions(kernels) immersed in a 'sea' of mobile electrons.

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Akshra Gupta 7 years ago

Metallic solid

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What is the oxidation state of hydrogen in HCl

Posted by Abhishek Mewada 7 years ago

CBSE > Class 12 > Chemistry

3 answers

Arti Vishwakarma 7 years ago

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Priyanshu Kumar 7 years ago

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Akshra Gupta 7 years ago

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Differentiate between order and molecularity of a reaction? At least 5 points.

Posted by Ayush Kumar Gupta 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 7 years ago

Order	Molecularity
It is the sum of powers of the concentrations in the rate law expressions.	It is the number of molecules of the reactants taking part in an elementary reaction.
Order corresponds to the overall reaction.	Molecularity is for elementary reactions.
Order might involve one elementary reaction or it might involve a sequence of elementary reactions.	Molecularity is a part of the whole reaction.
It is an experimentally determined value.	It is a theoretical concept.
It can have fractional value.	It is always a whole number.
It can assume zero value.	It can not have zero value.
Order of a reaction can change with the conditions such as pressure, temperature, concentration etc.	Molecularity is invariant for a chemical equation.

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What is alkaline

Posted by Krupal Suhil 7 years ago

CBSE > Class 12 > Chemistry

2 answers

A Sri 7 years ago

Its about having properties of alkali..having ph greater than 7..

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Shiv Kumar 7 years ago

Which is basic in nature .and giv OH in aq.solution

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Difference between the aeromatic and aeromaticity

Posted by Sidharath Singh 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 7 years ago

Aromaticity is defined as a property of the conjugated cycloalkenes which enhances the stabilization of a molecule due to its ability of electrons present in the ππ orbitals for the purpose of delocalization. In the organic chemistry, Aromaticity describes the cyclic and planar molecules having resonance bonds exhibiting more stability than the connective or geometric arrangements within the same kind of atoms.
Aromatic molecules are said to be very stable and they do not break so easily and also reacts with other types of substances. The organic compounds which are not said to be aromatic are known as aliphatic compounds. These might be in cyclic form, but only the aromatic rings have the special kind of stability.

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Noble gases have low boiling points?explain.

Posted by Navjot Singh 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Gaurav Seth 7 years ago

Noble gases being monoatomic have no interatomic forces except weak dispersion forces and therefore, they are liquefied at verylow temperatures. Hence, they have low boiling points.

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Give the test between benzophenone and acetophenone

Posted by Prem Singh 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Shivangi Mukherjee 7 years ago

Carbylamine test

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What is aqua regia?

Posted by Shaista Siddiqui 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Aman Yadav 7 years ago

3Hcl & 1Hno3

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Àñshul Shärmã 7 years ago

Mixture of nitric acid and HCl

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Why d block elements

Posted by Ankush Sharma 7 years ago

CBSE > Class 12 > Chemistry

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Which book we should prefer to do the objectives for jee of chemistry

Posted by Nitika Neb 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Aryan Rai 7 years ago

Hey Nitika.. I'm not a guy for JEE and all but upon seeing your question, I called my friend who is in Allen,Kota now and he suggested that only thorough NCERT and previous year question papers is sufficient for Chemistry as his teachers also suggest the same. However, upon my reluctance, he suggested that for Physical there is a book by Narendra Awasthi and for IOC there is a book called Wiley's J.D Lee modified by Guha which guys out there prefer but they don't practice these books. So it's upto you with which book would you like to go.. NCERT or the other books mentioned above. Hope this was helpful to you :)

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Unit cell parameters

Posted by Gaurav Sharma 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Gaurav Sharma 7 years ago

???????

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Gaurav Sharma 7 years ago

What is the video of this topic

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Phenols give o& p- nitrophenols on nitration with conc.HNO3&H2SO4

Posted by A Sri 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Saumya Agrawal 7 years ago

Because of resonance the electron density on o and p increses thus phenol (have electronegative element oxygen ) give o and p nitrophenols..

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My chemistry pre board exam is on monday i.e. 17/12/2018 how can i prepare of it so i can score good marks

Posted by Stuti Mehra 7 years ago

CBSE > Class 12 > Chemistry

6 answers

Nitika Neb 7 years ago

You should do the ten year papers and latest sample paper property

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Aryan Rai 7 years ago

sorry for the mistake.. p block consists of 8M.

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Pavankumar Anand 7 years ago

There is a high chance of getting 5 mark question for chapter 2

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Aryan Rai 7 years ago

@Stuti offcouse i can give you. So it depends on you that in what way it is convenient for you. if you want on gmail then I'm okay with that, if you want on WhatsApp then also it's ok. or any other platform. so it's your choice . :)

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Aryan Rai 7 years ago

First do the 1st 4 chapters of Organic and then move to Physical and Inorganic. Try to practice numericals from these. Don't worry the numericals are easy. They are based on formulae only so remember all the formulae and then do p-block as it consists of 10M. After that do Co-ordination and complete rest chapters from Part-1 first. Then at last go for Polymers first and then Bio-molecules and at last if you have time left then study Chemistry in Everyday Life.

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Aryan Rai 7 years ago

Yaar.. tumhare paas 2 din hai!!!

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Discuss the effect of pressure and temperature on the adsorption of gases on solids. Describe the application of adsorption in controlling humidity.

Posted by Harpreet Kaur 7 years ago

CBSE > Class 12 > Chemistry

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Define craft temprtature

Posted by Vivek Singh 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Nitika Neb 7 years ago

Temperature above which miscell formation starts taking place

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Hunsdicker reaction

Posted by Rahul Choudhary 7 years ago

CBSE > Class 12 > Chemistry

1 answers

A Sri 7 years ago

The silver salts of carboxylic react with halogens to yield alkyl halides..

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How to balance. equations

Posted by Neena Sahu 5 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Ayush Kumar Gupta 7 years ago

By half reduction and oxidation method

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Find shape and magnetic property of [Ni(CN)⁴]-2

Posted by Vivek Singh 7 years ago

CBSE > Class 12 > Chemistry

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If a coordination compound contains both strong and weak ligand,will the pairing happenor not. Ex:)[Co (CN)3 (Cl)3]n+.

Posted by Manoj Mass 7 years ago

CBSE > Class 12 > Chemistry

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What is hybridization in (Fe(en)2Cl2)Cl?

Posted by Jai Sharma 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Shama Parveen 5 years, 2 months ago

d2sp3

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How to prepare 100ml of M/20 solution of oxalic acid

Posted by Jay Singh Rathore 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Abhishek Chaurasiya 7 years ago

This is practical question so you can ask by your subject teacher. Best of luck.

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Manik Dhiman 7 years ago

By hands....????

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what does alitame compose of??

Posted by Shaima Ameen 7 years ago

CBSE > Class 12 > Chemistry

0 answers

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What is tear gas?

Posted by Srivinayak V 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Vivek Singh 7 years ago

....

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Yogita Ingle 7 years ago

Actually, tear gas agents are not only gases. Some of them are solids at normal temperature which are suspended in solution and sprayed as aerosols.
There are different types of compounds that may be used as tear gas.
Chloropicrin (Cl₃CNO₂) is one of the tear gas which also called trichloronitromethane, toxic organic compound .Its vapours are irritating to the skin, eyes, and upper respiratory tract, and it has been used in chemical warfare and as a tear gas.
It is manufactured by the reaction of nitro methane with sodium hypochlorite sodium hypochlorite.
H₃CNO₂ + 3 NaOCl → Cl₃CNO₂ + 3 NaOH

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Name the non stoichiometric point defect responsible for colour in alkali metal halis.

Posted by Rishabh Kumar 7 years ago

CBSE > Class 12 > Chemistry