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

Suno jisko bhi chemistry me prblm hai wo sonipat Rakesh Kumar sir (my tution teacher)ke notes padho it's my guarantee that you will score above 65out of 70

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Calculate the bond enthalpy of N-H bond in NH3 (given) 1/2N2(g)+3/2H2(g)---------=NH3(g) delta H = -46Kmol

Posted by Kamaal Ansari 8 years, 1 month ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What are reducing sugar?

Posted by Shefali Shrivas 8 years, 1 month ago

CBSE > Class 12 > Chemistry

3 answers

Hitesh Kumar 8 years, 1 month ago

Yaar what is toilet reagent???????just kidding

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Insha Fatima 8 years, 1 month ago

They are basically carbohydrates which are capable of reducing feeling solution and toilets reagent.

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Hitesh Kumar 8 years, 1 month ago

A reducing sugar is any sugar that is capable of acting as a reducing agent because it has a free aldehyde group or a free ketone group. Example of reduving sugar are all monosaccharides etc....??

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The molecule which has zero dipole moment is

Posted by Ambrish Yadav 8 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Radhika Tyagi 8 years, 1 month ago

Any regular geometry

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Hitesh Kumar 8 years, 1 month ago

CCL4 and CO2

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ANSWER

Difference between polymers nd macromolecules

Posted by Astha Mishra 8 years, 1 month ago

CBSE > Class 12 > Chemistry

4 answers

Hitesh Kumar 8 years, 1 month ago

Question bhi to 1 he hai toh answer bhi 1 he hoga na yaar???

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Aisha Grewal 8 years, 1 month ago

Baat to ek hii h

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Hitesh Kumar 8 years, 1 month ago

Macromolecules are molecules made of smaller subunits. Polymers are macromolecules made of repeating subunits.

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Aisha Grewal 8 years, 1 month ago

A polymer is made up of small repeating structural unit.... Whereas macromolecular are not composed of repeating units

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ANSWER

What are cationic and anionic detergents?

Posted by Love Sidhu 8 years, 1 month ago

CBSE > Class 12 > Chemistry

5 answers

Shalini Tiwari 8 years, 1 month ago

ANIONIC DETERGENT- these are sodium salts of sulphonated long chain alcohols or hydrocarbons. CATIONIC DETERGENT- these are quartenery ammonium salts of halides.

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Aisha Grewal 8 years, 1 month ago

Anionic in which polar part of molecule is negative ion. While cationic are those in which polar part is cation ion

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Vijeta Kanwar 8 years, 1 month ago

Hloo shtabdi

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Shatabdi Biswas 8 years, 1 month ago

Sorry see in ncert book

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Shatabdi Biswas 8 years, 1 month ago

See in never book

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How to get 50+ marks in chemistry out of 70 marks

Posted by Sheetal Wankhede 8 years, 1 month ago

CBSE > Class 12 > Chemistry

10 answers

Unique Person Arupitw 8 years, 1 month ago

Welcome

2Thank You

Hitesh Kumar 8 years, 1 month ago

Thanks Unique person ?

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Unique Person Arupitw 8 years, 1 month ago

By the way arihant is best

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Unique Person Arupitw 8 years, 1 month ago

Only 50+

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Hitesh Kumar 8 years, 1 month ago

Arihant is the best for all subjects ??

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Aisha Grewal 8 years, 1 month ago

According to me, arihant is best for physics....

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Hitesh Kumar 8 years, 1 month ago

Yeah I no that. But if you want to score good in less time then Arihant is more better than Xam Idea.???

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Aisha Grewal 8 years, 1 month ago

Xam idea better than arihant

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Hitesh Kumar 8 years, 1 month ago

Arihant +cbse guide app

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Aisha Grewal 8 years, 1 month ago

Xam idea

1Thank You

ANSWER

How we take anion and cation in nomenclature of coordination compound

Posted by Shivani Tyagi 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Hitesh Kumar 8 years, 1 month ago

See in NCERT notebook???

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How to write electronic configuration auflous rule

Posted by Kaushal Kumar 8 years, 1 month ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

write significance of henry's constant?

Posted by Anjali Tamboli 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Hitesh Kumar 8 years, 1 month ago

?.During scuba diving, driver breathes in the compressed air from supply tank , more Nitrogen is dissolved in blood because of more pressure at depth ?. Henry's constant plays a vital role in environmental chemistry.

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why ammonia and hcl do not obeys henry's law ?

Posted by Anjali Tamboli 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Radhika Tyagi 8 years, 1 month ago

Nh3 and hcl react to form nh4cl which may lead to a change in composition. Therefore Henry's law is not applicable as composition changes

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why helium is used in diving apparatus?

Posted by Anjali Tamboli 8 years, 1 month ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Is derivation of nerns't equation is important for exam point of view?

Posted by Sheetal Wankhede 8 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Radhika Tyagi 8 years, 1 month ago

Do only numericals

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Aisha Grewal 8 years, 1 month ago

No....

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So2 is reducing agent while Teo2 is an oxidizing agent. How? If I write the sulphur configuration then it's end with 3p orbital. It have no d orbital so how it's reduction number changes from 4 to 6

Posted by Ashish Singh 8 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Ashish Singh 8 years, 1 month ago

How can you proof. That it's oxides from 4 to 6.

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Radhika Tyagi 8 years, 1 month ago

So2 tends to oxidize itself from +4 to +6 therefore acting as reducing agent whereas due to inert pair effect teo2 tends to reduce itself thereby acting as oxidizing agent

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Define solid state

Posted by Aditya Pandey 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Aisha Grewal 8 years, 1 month ago

Unit hii define krn h kya

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ANSWER

Calculate the mass percentage of benzene and carbamate tetrachloride if22g of benzene is resolved in 122g of carbon tetrachloride

Posted by Abhimanyu Yadav 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Abhimanyu Yadav 8 years, 1 month ago

Benzene 15.28per and carbon tetrachloride 84.72

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What is hyperconjugation

Posted by Kumar Lekhraj 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Hitesh Kumar 8 years, 1 month ago

Hyperconjugation is the stabilising interaction that results from the interaction of the electrons in a σ-bond (usually C-H or C-C) with an adjacent empty or partially filled p-orbital or a π-orbital to give an extended molecular orbital that increases the stability of the system.

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Why transition metals used as catalyst ?

Posted by Salman Arora 8 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Radhika Tyagi 8 years, 1 month ago

Bcz they are good absorbant

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Prateek Gupta 8 years, 1 month ago

Because they have property of changing oxidation state and even they absorb other substances on their surface

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ANSWER

What is the cordination no in a close packed structure

Posted by Rahul Patra 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Aisha Grewal 8 years, 1 month ago

Hcp had coordination no. 12and contains 6 atoms per unit cell Fcc had coordination no 12 and contains 4atoms per unit cell Bcc had coordination no 8 contain 2atoms per unit cell

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ANSWER

Electricity

Posted by Vishal Rana 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Amit Kumar 8 years, 1 month ago

mare tabelen ni gayi hui hai bassan garmi teh pareshan hu gayi teh ... doodh bhi jaal ke pannir ban jawai hai

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ANSWER

What is Zeolites

Posted by Jasbir Singh 8 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Amit Kumar 8 years, 1 month ago

zeolites are aluminiumsilicate metal compounds . its oxide of metals and found in nature as well as can be synthesised in lab . it has porous structure and hence its a shape selective catalyst. its used in petrochemical industry manly for converting petroleum into gasoline directly

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Hitesh Kumar 8 years, 1 month ago

Zeolites are crystalline solids structures made of silicon, aluminum and oxygen that form a framework with cavities and channels inside where cations, water and/or small molecules may reside.

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What is the absorbent in high vaccume

Posted by Shashidhara Pg 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Amit Kumar 8 years, 1 month ago

can you frame your question more appropriately please

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Why vitamin c cannot be stored in our body?

Posted by Samrat Rc 8 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Amit Kumar 8 years, 1 month ago

because it leaks via urine as its water soluble . agar hum toilet nahi karengey toh yeah sallir mei rawat hai

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Radhika Tyagi 8 years, 1 month ago

Bcz it is a water soluble vitamin and gets excreted out of the body. Therefore it cannot be stored in the body.

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ANSWER

After 5 half period of a first order reaction what fraction of reactant remains?

Posted by Hitesh Kumar 8 years, 1 month ago

CBSE > Class 12 > Chemistry

4 answers

Hitesh Kumar 8 years, 1 month ago

Thanks Ravi??

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Ravi Singh 8 years, 1 month ago

Nt = No (1/2)^5 = No/32 so, 1/32 times of initial reactant remains

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Hitesh Kumar 8 years, 1 month ago

Lakin answer ye nahi hai ????

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Radhika Tyagi 8 years, 1 month ago

3.125

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What are 12-16and13-15 compounds? Give example.

Posted by Shailesh Kumar 8 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Radhika Tyagi 8 years, 1 month ago

Grp 12-16 compounds are those compounds which are formed by cation of grp 12 and anion of grp 16. Eg ZnS Similarly for grp 13-15 compounds. Eg GaAs

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Amit Kumar 8 years, 1 month ago

nahi pata eg bhi nahi pata

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What type of linkage holds together the monomers of D.N.A

Posted by Shailesh Kumar 8 years, 1 month ago

CBSE > Class 12 > Chemistry

3 answers

Amit Kumar 8 years, 1 month ago

anjali galat answer na dey rei chori

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Anjali Sharma 8 years, 1 month ago

Phosphodiester bond

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Amit Kumar 8 years, 1 month ago

friendship ka bond

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number of sigma and pie bond in c2 molecules

Posted by Shubham Deo 8 years, 1 month ago

CBSE > Class 12 > Chemistry

5 answers

Hitesh Kumar 8 years, 1 month ago

Draw the mot diagram. You will realise that that the bonding electrons are in the shell ie pi(2px) and pi(2py) hence they participate in bonding as the rest of the electron are considered as inner shell electrons. And these orbitals are pi type hence pi bonds are formed.

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Vijay Bhatt 8 years, 1 month ago

To be pie there must be a Sigma bond

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Vijay Bhatt 8 years, 1 month ago

How hitesh

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Hitesh Kumar 8 years, 1 month ago

No of sigma bond =0 No of pi bonds is =2

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Vijay Bhatt 8 years, 1 month ago

C2 contains single bond means 1Sigma Double bond means 1 Sigma and 1 pie Triple bond means 1 Sigma and 2 pie

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Give the significance of a 'lattice point'.

Posted by Aditya Raj 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Hitesh Kumar 8 years, 1 month ago

Lattice point represents the constituent particles of a crystalline solid (as points). These constituent particles may be an atom, molecule or an ion.

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Name the parametres that characteristics a unit cell.

Posted by Aditya Raj 8 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Hitesh Kumar 8 years, 1 month ago

A unit cell is characterised by six parameters: (i) dimensions of unit cell along the three edges, . i.e. a, b, c. (ii) three angles between the edges

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Cyclo hexyl methanol

Posted by Anjali Gupta 8 years, 1 month ago

CBSE > Class 12 > Chemistry