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ANSWER

Which electrolyte is used in h2-o2 fuel cells????

Posted by Anushree Agarwal 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Kriti Sharma 6 years, 1 month ago

Koh or Sodium hydroxide solution is used as a catalyst in fuel cells which produce electrical energy directly from the combustion of fuel such as hydrogen ....carbon monoxide and methane the one you are asking about that is H2 O2 fuel cell is the most successful one??

Rutkar Bhat 6 years, 1 month ago

H2so4

ANSWER

Kirti please biomolecules revise karva do???

Posted by Aryan Ruhal 6 years, 1 month ago

CBSE > Class 12 > Chemistry

7 answers

Lakshya ? 6 years, 1 month ago

Thanks kriti...?

Kriti Sharma 6 years, 1 month ago

Bio molecule...... bio means living .........molecules.means substances .examples of biomolecules are.... polysaccharides .....saccharides stands for sugars .............polysaccharides means long molecules of sugar ......ok like sucrose which is formed from glucose and fructose........ galactose from glucose and lactose..... ok sometimes questions are asked the like.......what would be the result of the hydrolysis of sucrose ........answer is glucose and Fructose.......... reducing sugars are those carbohydrates which contain free aldehyde aur Ketone group ..........and hence reduce fehling solution and tollens reagent.......... non reducing sugar are just opposite ......example sucrose....... remember whenever we treat glucose with hydrogen iodide we get a linear hexane......... there are two types of amino acids ..........essential...... non essential essential .....1 one are not produced by the body .......non essential one are produced by the body .......types of proteins fibrous proteins which are insoluble in water ........Globular proteins are soluble in water.......... constituents of nucleic acids are pentose sugar ......phosphoric acid...... nitrogenous base............ nitrogenous base of two types....... pyrimidines cytosine thymine uracil .......purine adenine and guanine ........ two types ........fat soluble vitamins vitamin A D E K are fat soluble........ and a stored in liver and adipose tissues...... water soluble Vitamin B and C....... remember the question........ why Vitamin C can not be stored inside our body the reason is......... because it is a water soluble vitamin and hence it is excreted out from the body regularly and hence we need a regular supply of Vitamin C....... come to the the chemical names of some vitamins Vitamin B1 thiamine ........vitamin B2 riboflavin.......... Vitamin B6 pyridoxine......Vitamin C ascorbic acid........ so questions which came in last year and important one are what is glycogen............ as the name suggest glyco means related to glucose and is a polymer of glucose and glycogen is stored in animal bodies in the same way cellulose is stored in plant bodies...... difference between nucleoside and nucleotide.......hope it helps you if it helped please write??

3Thank You

Manjay Jha 6 years, 1 month ago

Pura biomolecules how can i explain it to you. I can just say that learn the difference btw Amylose and Amylopectin.....products of sucrose, lactose and maltose when there are hydrolysed... What is nucleoside and nucleotide...diffrence btw rna and dna...glycogen and starch...invert sugar...denaturation of protein...essential non essential amino acids... alpha helix and beta helix...peptide linkage...types of rna found in the cell!!! I think that's enough.

Aryan Ruhal 6 years, 1 month ago

Shruti you are right but can u explain

Manjay Jha 6 years, 1 month ago

Haha areey that's easy. But i think you guy's are maths students, isn't? Cuz' bio ke hote to itni prblm nahi hain because ye same chapter 11th me bhi tha. But clam down and chillax ho jayega!

Lakshya ? 6 years, 1 month ago

Ha mujhe bhi....

Varsha Tripathy 6 years, 1 month ago

Ha plzzz krwa do i also need that

ANSWER

What is the procedure of victor mayer test

Posted by Amrit Amrit 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

In victor Meyer test when alcohols are treated with HI,AgNO 2 and NaOH respectively they produce red, blue and colourless solution.

Rajat Barwar 6 years, 1 month ago

I know it, but abhi recall nahi ho raha,not revised. But ye NCERT me nahi hai.

ANSWER

How I got 70 /70 after complete revision of chemistry

Posted by Shreya Dixit 6 years, 1 month ago

CBSE > Class 12 > Chemistry

3 answers

Kriti Sharma 6 years, 1 month ago

Everyone wants to get 70 out of 70 .......but we never know what the paper would be like...... we can say be positive only ....??

Amrit Amrit 6 years, 1 month ago

Then write all the answer in exams...And then wait

Lakshya ? 6 years, 1 month ago

By writing correct answers in exam...????

ANSWER

Why doesn't oxygen form of6

Posted by Harsh Pratap Singh 6 years, 1 month ago

CBSE > Class 12 > Chemistry

3 answers

Amrit Amrit 6 years, 1 month ago

Don't have 6 oxidation state

Amrit Amrit 6 years, 1 month ago

No D orbitals

Shreya .. 6 years, 1 month ago

Oxygen cannot expand it's octet

ANSWER

What is sexual reproduction?

Posted by Nawab Shaykh 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Nawab Shaykh 6 years, 1 month ago

Are to phle chptr se kuch bhi nhi aayega .. Aayega n to bss

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

bio main itna simple question nhi ayega krna hai toh biotechnology se ya molecular inheritance se karo

ANSWER

H2O is strong ligand or weak?? Ps. I know bohot silly sa question h but who cares??

Posted by Manjay Jha 6 years, 1 month ago

CBSE > Class 12 > Chemistry

3 answers

Rajat Barwar 6 years, 1 month ago

Weak ligand. Strong only in some cases.

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

weak ligand. ??

Shikhar Tripathi 6 years, 1 month ago

Weak ligand. Strong only for cu+2.

ANSWER

What is the reason for stability of colloidal sols?

Posted by Kriti Sharma 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

The main reason for stability of colloidal sol is that all colloidal particles in the sol carry the same charge hence they repel each other and cannot coagulate.

Yogita Ingle 6 years, 1 month ago

There are two main reasons for the stability of colloidal sols:
Solvation: Colloidal particles are covered by a sheath of liquid in which they are extensively solvated, thereby providing stability.

Electrostatic stabilisation: Presence of equal and similar charges on the colloidal particles prevents coagulation of the colloidal sol.

ANSWER

Is it necessary to write bi products in organic reacns.

Posted by ... .. 6 years, 1 month ago

CBSE > Class 12 > Chemistry

4 answers

Abhinav Singh 6 years, 1 month ago

Main nahi jaanta

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

naa bus salicylic aldehyde mein mention krna hai

... .. 6 years, 1 month ago

Aur intermideate likhna???

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

none only main product until and unless bola na jaye question mein toh mat likhna.. aur balance bhi mat krna organic mein

ANSWER

Is only naming reactions are sufficient for organic chemistry

Posted by Only A User 6 years, 1 month ago

CBSE > Class 12 > Chemistry

4 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

naming kr lo, conversion aur reasoning questions bus... bht hai organic le liye..

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

@kirti didi itna bhi nhi hai jitna bata diya apne... pura copy paste nhi krna. ?????

Veena Sharma 6 years, 1 month ago

Mtlb sb aana chahiye organic ka...

Kriti Sharma 6 years, 1 month ago

No naming reactions are enough but not sufficient for Organic Chemistry........ you must know about the conversions happening in organic chemistry....... you must know about the chemical tests to distinguish between various compounds...... you must know about the .....acidic ......basic..... alcoholic strength ......knowing about decreasing order of pkb values...... boiling point .....solubility in water ......are really very important .......IUPAC names .......some conceptual questions........ like" aldehydes are more reactive than ketones towards nucleophile"...... the answer is simple due to steric and electronic reasons..........,... effect of substituents on the acidic strength ........SN1 SN2 ..........drawing The structures of the given compound ..................suggesting reagent for the conversion .............for example .............question is suggest. reagent for conversion of Ethanol to ethanoic acid ............answer is very simple any oxidizing agent like kmno4 or. K2 cr2 O7.......?

ANSWER

Dilysise

Posted by Naothen Sharma 6 years, 1 month ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Important topics of aldehyde ketone and carboxylic

Posted by Varsha Sharma 6 years, 1 month ago

CBSE > Class 12 > Chemistry

3 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

naming, conversion and test bus.

Lakshya ? 6 years, 1 month ago

Again kriti n pura chapter revise kra dia...?????

Kriti Sharma 6 years, 1 month ago

Important topics of aldehyde ketones and carboxylic acid....... are first of all IUPAC names seriously these are very important because in boards difficult questions come from IUPAC names ..............you must know about hydroboration oxidation. in which addition of water takes place according to anti markovnikov rule this is very simple and is asked many times in board just add water according to anti markovnikov rule simple............. oxymercuration demercuration ..........similar to that of hydroboration and oxidation just add water according to markovnikov rule ............clemmensen reduction .........certain conversions are important........ for example....... convert .........chlorobenzene to phenol....... in which you just need to add NaOH. to the chlorobenzene......... conversion of benzene to phenol ................Williamson synthesis is very very important....... just revise it very very important.......... kolbe reaction ................reimer tiemann reaction .................distinguishing tests like .....Lucas test ....which is based on turbidity appearance.......... Iodoform test.......... ferric chloride test ...........phenol gives a violet coloured water soluble Complex with ferric chloride.............?

3Thank You

ANSWER

How to identify what type of Isomerism is show by a coordinate compound ?

Posted by Amrit Amrit 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

abb vo toh raz hai. ?

Abhinav Singh 6 years, 1 month ago

Nikle phrele furshat mein

ANSWER

MnO2+KOH+O2

Posted by Anas Malik 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Shreya .. 6 years, 1 month ago

K2MnO4+H2O

Harsh Khatri 6 years, 1 month ago

Whats this

ANSWER

Is coordination compound important chapter

Posted by Punyakrit Singh 6 years, 1 month ago

CBSE > Class 12 > Chemistry

6 answers

Kriti Sharma 6 years, 1 month ago

Yes ........it is important .......werner's theory is very important .........valence bond theory....... crystal field theory .......isomerism are the favourite topics of the board.....?

Amrit Amrit 6 years, 1 month ago

Not much for board , only nomenclature , vbt , isomerism are important

Harsh Khatri 6 years, 1 month ago

Topper ke liye??

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

g bht imp hai ye.

Ashish Ranjan 6 years, 1 month ago

Shayad hmne toh paper set nhi kiya hai

Tamanna Sharma 6 years, 1 month ago

Yes

ANSWER

For numerical questions...molar mass atoms ka diya hoga ques mai??

Posted by Xyz Abc 6 years, 1 month ago

CBSE > Class 12 > Chemistry

3 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

hnn diya hoga but kuch he compounds ka.

Xyz Abc 6 years, 1 month ago

Cobalt?

Tamanna Sharma 6 years, 1 month ago

If its tough one then definitely given

ANSWER

Exam mai log ki values di hongi?

Posted by Xyz Abc 6 years, 1 month ago

CBSE > Class 12 > Chemistry

7 answers

Abhinav Singh 6 years, 1 month ago

Bilkul nahi .log book denge

Kriti Sharma 6 years, 1 month ago

Yes..... log table will be provided to us as in my examination centre ......log table was provided in physics exam also .......so it is very obvious to provide it in chemistry exam....?

Harsh Khatri 6 years, 1 month ago

Yes

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

di hogi

Meghna Shrivastav? 6 years, 1 month ago

I think log tables mila gi

Tamanna Sharma 6 years, 1 month ago

May be

Sheshank Shekharr 6 years, 1 month ago

Humm

ANSWER

Whay happens when we place the blood cell in water ? Give reason.

Posted by Mohan Singh 6 years, 1 month ago

CBSE > Class 12 > Chemistry

5 answers

Mohan Singh 6 years, 1 month ago

Kriti will u change your rose

Kriti Sharma 6 years, 1 month ago

It is an easy question ........when blood cells are placed in water......... water from higher concentration moves to the concentration where it is low...... that is blood cell as a result blood cell will absorb a lot of water due to the process of endo osmosis and endo Osmosis ,,,,,,,,we all know that is movement of solute through a semipermeable membrane.......... as a result of that blood cell will burst out......?

Neha Choudhary 6 years, 1 month ago

Blod cells swells due to osmosis and brust

Harsh Khatri 6 years, 1 month ago

Phenomenan depend on the conc of salt in water

Tamanna Sharma 6 years, 1 month ago

Phenomenon depends on conc of water ( hypotonic or hypertonic solution)

ANSWER

Basicity of caros acid(H2SO5) ??

Posted by ? ? 6 years, 1 month ago

CBSE > Class 12 > Chemistry

4 answers

Madhav Mittal 3 years ago

Madhav Mittal 3 years ago

Harsh Khatri 6 years, 1 month ago

Tamanna Sharma 6 years, 1 month ago

ANSWER

From which lesons do we get 5M ques?

Posted by Sruthi Prabha 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Harsh Khatri 6 years, 1 month ago

Electro

Punyakrit Singh 6 years, 1 month ago

Organic

ANSWER

Out of H2S and H2O whose bond angle is larger ?

Posted by Riya Rana 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Manjay Jha 6 years, 1 month ago

H2O

? ? 6 years, 1 month ago

H2O...as down the group bond angle of hydrides decreases due to decrease in EN

ANSWER

What all to Prepare to pass in this subject for the upcoming board Exam ??? I mean Specific Questions. Please do help

Posted by Momo Learns 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Veena Sharma 6 years, 1 month ago

Last 3 chp. Ki ncert or pdf ki ncert surface chm. And sol. Pass hojaoge aaram se agr yeh chp. Ache se kr loge toh.... Or ha agr previous years k question paper try krlena definitely it will help u....

Yogesh Kumar 6 years, 1 month ago

Chemisty every day

ANSWER

Why raoult's law is applicable for very dilute solutions only? Pllzzzzzz answer faasttttt...

Posted by Xyz Abc 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Yogesh Kumar 6 years, 1 month ago

Its wrong. Henry law is applicable for gase

Amit Gupta 6 years, 1 month ago

Because Raoult's law is applicable only on ideal solutions and only dilute solutions behave as an ideal solution.

3Thank You

ANSWER

Important in d blovk

Posted by Ll Jain 6 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Yogesh Kumar 6 years, 1 month ago

Not that much

ANSWER

Guy's padhne se pehle you should know the syllabus. So please go and check it on mycbseguide.com itself. Polymers and chemistry in everyday life se kuch topics are omitted! Please jaiye and dekhiye!

Posted by Manjay Jha 6 years, 1 month ago

CBSE > Class 12 > Chemistry

6 answers

Muskaan Vig 6 years, 1 month ago

Thank you so much shruti?

Manjay Jha 6 years, 1 month ago

No, Muskaan! In polymers syllabus is from copolymerisation

Muskaan Vig 6 years, 1 month ago

Thank you Shruti.. Is Classification of polymers..there in our syllabus?

Riya Rana 6 years, 1 month ago

Tomorrow is our exam most of us already must know that...!!

Nishant Kumar 6 years, 1 month ago

yeah i knw

Tamanna Sharma 6 years, 1 month ago

ANSWER

Koi yaar chenistry ka mai main chapter batawo jisse mai 30 Number gain kr paau

Posted by Dheeraj Singh 6 years, 1 month ago

CBSE > Class 12 > Chemistry

5 answers

Kriti Sharma 6 years, 1 month ago

Revise naming reaction fast by heart............. as one of them will definitely come .......after that revise chemistry in everyday life ........biomolecules......... polymers and metallurgy these are easy chapters as well as scoring definitely by revising these chapters you can get good marks ......revise colloids from surface chemistry....... as question comes from them revise nurst equation .......numericals come from it I think it is sufficient to score 30 marks ......better you should think little higher.?

Nishant Kumar 6 years, 1 month ago

suru k 4+ pdf

Tamanna Sharma 6 years, 1 month ago

To hmm to mamu log he

Tamanna Sharma 6 years, 1 month ago

Jitna time he ,utne me bass 5 previo4year ratt lo, l know science student hoke aise khena to nahi chahiye lekin ek rat me to muna bhai ne bhi ans ka ratta hi mara tha.?

Tapan Pandey?? 6 years, 1 month ago

Biomolecules, polymers, aldehydes ketones surface chemistry, chemical kinetics, coordination compounds,and metallurgy