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

In simple words if you want to differentiate the u can simply answer like this Dna has double strand whereas rna has single strand. Dna contains deoxyribose sugar whereas rna contains ribose sugar. Dna helps in transfer of genetic characters whereas rna helps in synthesizing proteins. Dna has ATGC nucleotide and rna contain AUGC. Dna is of one type and rna is of 3 type mrna rrna and trna. Hope you liked the answer.......

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Sonu Rao 6 years, 1 month ago

The sugar present in DNA is it 2 deoxyribose DNA contain cytosine thymine guanin adenin bases DNA has double standard alpha helix structure DNA has property of replication DNA control the transmission of hereditary the sugar present in RNA is d ribose RNA contain cytosine uracil guanine and adenin bases RNA has single stranded alpha helix structure of rNA has not property of replication of rNA control the synthesis of protein

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ANSWER

Sir i anable find log and antilog from logtable please guide me . And help me.

Posted by Mohan Singh 6 years, 1 month ago

CBSE > Class 12 > Chemistry

3 answers

Vinay Gautam 6 years, 1 month ago

Yeh u should lrn how to read log table either from utube or from ur teacher

1Thank You

Pawan Kumar 6 years, 1 month ago

1Thank You

Tamanna Sharma 6 years, 1 month ago

You can see a video from YouTube channel (All' Bout Chemistry ) lecture how to calculate log and antilog l Reading log table ??l hope this will help you.

1Thank You

ANSWER

Structures of isomeric halo and polyhaloalkane

Posted by Goyal'S Freefire 6 years, 1 month ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Do iodoalkanes can be prepared from action of thionyl nd free raducal halogenation

Posted by Goyal'S Freefire 6 years, 1 month ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

How many molecules of water directly attached to the metal centre in CuSO4 .5H2O

Posted by Tamanna Sharma 6 years, 1 month ago

CBSE > Class 12 > Chemistry

24 answers

Tapan Pandey?? 6 years, 1 month ago

In CuSO4.5H2O, Cu is cordinated with 4 water molecules and two more oxygen atoms fron Sulphate ion. Now fifth water molecule is hydrogen bonded and is deeply embedded in crystal. It is not cordinated. Only 4 water molecules are coordinated and fifth is only hydrogen bonded.

1Thank You

Aditya Chauhan 6 years, 1 month ago

Carry on that was not the insult that was the swag i too am from haryama

1Thank You

Tamanna Sharma 6 years, 1 month ago

Sabse phele chating me interest kisne dikhaya tha ,tumne matlab tum mujse bhi bade chaterbox ho

1Thank You

Tamanna Sharma 6 years, 1 month ago

Dude that was not good ,tum khod hi sab soch kar bathe ho

1Thank You

Tamanna Sharma 6 years, 1 month ago

But don't insult like that hello haryanvi

1Thank You

Adi Kumar 6 years, 1 month ago

Only one molecule of water which us outside the coordination sphere is hydrogen bonded the other four are coordinate bonded [Cu(H2O)4]^2+ so4^2- H2O

1Thank You

Tamanna Sharma 6 years, 1 month ago

Now ,you misunderstand as you know with board exam I have to prepare for jee also and in January attempt l got only 87 percentile so time is less and there is a lot of things which l have to cover,so sorry agar bura laga to??

1Thank You

Aditya Chauhan 6 years, 1 month ago

No No please carry on some misunderstanding took place sorry and all the best for your exam

2Thank You

Aditya Chauhan 6 years, 1 month ago

No no carry on misunderstanding took plaxe sorry please carry on your study and post many many many quetions

1Thank You

Tamanna Sharma 6 years, 1 month ago

As you know boards exam are near and l passed my whole year in time waste things ,so this is very important time for studies so if you share only study material then it's ok

1Thank You

Aditya Chauhan 6 years, 1 month ago

Sorry i got wrong you are not that i thought

1Thank You

Aditya Chauhan 6 years, 1 month ago

Hello haryanvi

1Thank You

Aditya Chauhan 6 years, 1 month ago

By making structure

1Thank You

Aditya Chauhan 6 years, 1 month ago

Mean personally wrong type

1Thank You

Tamanna Sharma 6 years, 1 month ago

Chalo ye sab chodo aur batao ki 4 ans kaise aya

1Thank You

Aditya Chauhan 6 years, 1 month ago

Can you chat petsonally on whtspp its public any one can report

1Thank You

Tamanna Sharma 6 years, 1 month ago

And you

1Thank You

Tamanna Sharma 6 years, 1 month ago

Haryana

1Thank You

Aditya Chauhan 6 years, 1 month ago

From where you are

2Thank You

Tamanna Sharma 6 years, 1 month ago

No, but why are you asking this question ?

1Thank You

Aditya Chauhan 6 years, 1 month ago

He tammana are u from himachal pradesh

2Thank You

Tamanna Sharma 6 years, 1 month ago

Aditya and U how you solve it,please give me some idea that how to solve this. Or tell me it's a learning fact or a calculative question

1Thank You

Aditya Chauhan 6 years, 1 month ago

2Thank You

U Know Me 6 years, 1 month ago

4Thank You

ANSWER

What is spiegeleisen form?

Posted by Tamanna Sharma 6 years, 1 month ago

CBSE > Class 12 > Chemistry

4 answers

Aditya Chauhan 6 years, 1 month ago

Sahi kaha

1Thank You

Tamanna Sharma 6 years, 1 month ago

Because if you are in class 12 then at this time your focus have to be on boards exams but you give class 11 ans as well .....great

0Thank You

Tamanna Sharma 6 years, 1 month ago

Yogita Ingle you are in which class 11 /12 or you are a dropper because l see you provide solution to the 11 class students as well of PCMB

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Yogita Ingle 6 years, 1 month ago

Spiegeleisen: It is an alloy of Manganese (20 - 30%) and carbon (5%) and Iron (remaining percentage).
Roles of spiegeleisen
1) It acts as a scavenger (cleaning agent).
2) It acts as a deoxidizer and removes oxidized iron if present.
3) It is added to the molten iron to maintain the required amount of carbon in steel.

2Thank You

ANSWER

What is bessemer process

Posted by Tamanna Sharma 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Aditya Chauhan 6 years, 1 month ago

Yes yogitya is Right

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Yogita Ingle 6 years, 1 month ago

Bessemer process, the first method discovered for mass-producing steel. Though named after Sir Henry Bessemer of England, the process evolved from the contributions of many investigators before it could be used on a broad commercial basis. It was apparently conceived independently and almost concurrently by Bessemer and by William Kelly of the United States. As early as 1847, Kelly, a businessman-scientist of Pittsburgh, began experiments aimed at developing a revolutionary means of removing impurities from pig iron by an air blast. Kelly theorized that not only would the air, injected into the molten iron, supply oxygen to react with the impurities, converting them into oxides separable as slag, but that the heat evolved in these reactions would increase the temperature of the mass, keeping it from solidifying during the operation. After several failures, he succeeded in proving his theory and rapidly producing steel ingots.

1Thank You

ANSWER

15th group in p- block is in slybus or not

Posted by Shashi Suthar 6 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Riya Rana 6 years, 1 month ago

No it is not in syllabus

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ANSWER

What is sintering?

Posted by Tamanna Sharma 6 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 1 month ago

Sintering is the process of converting powders into larger objects, using the principle of atomic diffusion. Under a specific pressure and heat below its melting point, the powder will diffuse and form a solid object.

1Thank You

ANSWER

What is amalgamation?

Posted by Tamanna Sharma 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Vaibhav Srivastava 6 years, 1 month ago

Amalgamation is the process of forming alloys of mercury by mixing it with any metal. For example, alloy of mercury and zinc.

1Thank You

Yogita Ingle 6 years, 1 month ago

Amalgamation is cosolidation of one or more entity to form form new entity while absorption is only merger of two compay no new company is created. amalgmation includes absorption

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ANSWER

Define tyndall cone

Posted by Tamanna Sharma 6 years, 1 month ago

CBSE > Class 12 > Chemistry

5 answers

Adi Kumar 6 years, 1 month ago

A shape of cone is firmed with rhe optical centre of lens and colloidal particle.you can draw the figure . Its enough for two marks.

1Thank You

Tamanna Sharma 6 years, 1 month ago

What we have to write if it's a 2 marks question

3Thank You

Adi Kumar 6 years, 1 month ago

The bright cone of light is called tyndall cone

1Thank You

Tamanna Sharma 6 years, 1 month ago

No, l was just write down my all queries at a page and when l have 8 to 9 question then l ask to you all that's why my queries are intermixed

2Thank You

Riya Rana 6 years, 1 month ago

Tamanna how many subjects do you study at the same time girl.. wowo

1Thank You

ANSWER

Alkylidene or alkylene dihalides are different terms ? Nd at what conditions they are used?

Posted by Goyal'S Freefire 6 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Mahi D 6 years, 1 month ago

Alkylidene halides means two same halogens on same carbon . They are geminal halides. Alkylene are vicinal halides which means two halogens attached to two adjacent carbon atoms

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ANSWER

How to study d and f block

Posted by Gunjan Meena 6 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Tamanna Sharma 6 years, 1 month ago

Do all NCERT questions, 5 Previous year questions by knowing the format ,then go for exemplar questions, it's enough

1Thank You

ANSWER

Esterification reaction

Posted by Sweta Thaapa 6 years, 1 month ago

CBSE > Class 12 > Chemistry

3 answers

Vaibhav Srivastava 6 years, 1 month ago

C2H5OH + CH3COOH---------->CH3COOC2H5 + H2O

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Tamanna Sharma 6 years, 1 month ago

Reaction of carboxylic acid and alcohol gives esterwith the elimination of water( acid se OH bahar jayega and alcohol se H bahar jayega) known as esterification reaction.

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Harshul Verma 6 years, 1 month ago

When an alcohol reacts with carboxyllic acid...a fruity smell like compound is formed known as ester and the process is known as esterification

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ANSWER

Give reason: structure of xenon fluorides cannot be explaied by valance bond approach.

Posted by Tamanna Sharma 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Yogita Ingle 6 years, 1 month ago

Structures of Xenon fluorides cannot be explained by Valence Bond approach. According to the valence bond approach, covalent bonds are formed by the overlapping of the half-filled atomic orbital. But xenon has a fully filled electronic configuration. Hence the structure of xenon fluorides cannot be explained by VBT

1Thank You

Riya Rana 6 years, 1 month ago

Bcoz xenon has fully filled orbital and stable electronic configuration hence cannot be understood by VBT

1Thank You

ANSWER

Write the preparation steps of calomel from corrosive sublimate.

Posted by Tamanna Sharma 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Tamanna Sharma 6 years, 1 month ago

Thanks for giving me extra information also ,along with my question

1Thank You

Yogita Ingle 6 years, 1 month ago

Hg₂Cl₂is known as calomel. It is prepared by heating HgCl₂ and Hg in an iron vessel. It can also be prepared by mixing mercury salt with chloride ions.
Properties
1) It is a white powder which is insoluble in water.
2) Hg₂Cl₂ on heating dissociates into HgCl₂ and Hg. action of calomel on heat 2"> Corrosive sublimate HgCl₂ is a corrosive sublimate, which is prepared by passing chlorine over heated mercury or mercury chloride.
It can also be prepared by heating mercury sulphate with NaCl. action of mercury sulphate with NaCl
Properties
1) It is a crystalline solid.
2) It is soluble in hot water, ethanol and ether.
3) HgCl₂ reacts with KI and forms a colorless solution known as Nessler`s reagent. nessler s reaction

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ANSWER

The pKa value for HOCl is higher than that of HOClO. Why?

Posted by Tamanna Sharma 6 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Riya Rana 6 years, 1 month ago

HOClO is more acidic because h+ ions can be furnished easily but since pKa value is inversely proportional to acidic character the pka value of HOClO is less and higher of HOCI

2Thank You

ANSWER

Which is more acidic &why. Meta hydroxy benzoic acid or benzoic acid

Posted by Shrey Mahajan 6 years, 1 month ago

CBSE > Class 12 > Chemistry

5 answers

Riya Rana 6 years, 1 month ago

Oh yes, my bad i wrote evrything entirely opposite.. yes you are right though.

1Thank You

Tamanna Sharma 6 years, 1 month ago

No, Riya the pKa value for meta hydroxybenzoic acid (4.08) and for benzoic acid is (4.19) so at this time Iwas right.

0Thank You

Riya Rana 6 years, 1 month ago

No tamanna benzoic acid is more acidic than meta hydroxybenzoic acid because tha pKa value of meta hydroxybenzoic acid is more it is less acidic. (BUT para hydroxybenzoic acid is more acidic than benzoic acid)

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Tamanna Sharma 6 years, 1 month ago

Metahydroxy benzoic acid is more acidic than benzoic acid because the -I and +R effect of OH group at meta position,-I effect will decrease the electron density from the ring and it can loose H+ easily from (COOH)

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Riya Rana 6 years, 1 month ago

Benzoic acid

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ANSWER

Write hybridisation of (Cr2(H2O)2(C2O4)2)‐

Posted by Vijay Singh 6 years, 1 month ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is a antiseptic

Posted by Omprakash Prajapati 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Vijay Singh 6 years, 1 month ago

Chemical substance which remove harmful microorganisms but harmless to living rissue is called anticeptic.

0Thank You

Omprakash Prajapati 6 years, 1 month ago

It is not harmful for tissue like 0.2phenol is a antiseptic

1Thank You

ANSWER

I've not studied anything for chemistry exams . if i will solve last year que ppr will that be useful??

Posted by Sachi Pandey 6 years, 1 month ago

CBSE > Class 12 > Chemistry

4 answers

Shubhashish Ranjan 6 years, 1 month ago

Go Through NCERT Exercise And Last 10 Years Questions.You'll Score Atleast 40 Marks In Theory.☺

1Thank You

Vijay Singh 6 years, 1 month ago

Solving minimum last 5 yrs paper is good for scoring good no in exam.

1Thank You

Achyut Singh 6 years, 1 month ago

Just solve prev. 10 year q.p. and you will be scoring full marks. Believe me this is not JEE. ?

2Thank You

Tamanna Sharma 6 years, 1 month ago

If your all basics are cleared then this will be definitely useful for you

4Thank You

ANSWER

Why does galvanic cell become dead after some time?

Posted by Kamalini Babu 6 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Riya Rana 6 years, 1 month ago

No involvement of ions

0Thank You

Tamanna Sharma 6 years, 1 month ago

Because after sometime electrolyte deposite on electrodes and there's no movement of ions in the solution and hence it doesn't generate potential difference and stops working.

1Thank You

ANSWER

Calculate mass of urea required in making 2.5 kg of 0.25 molal aqueous solution

Posted by Miss Priya Kumari 6 years, 1 month ago

CBSE > Class 12 > Chemistry

3 answers

Peshal Madhukar 6 years, 1 month ago

15gm

0Thank You

Tamanna Sharma 6 years, 1 month ago

Sorry I, forgot to multiply it by 60 molar mass of urea, so the ans is 37g ,

2Thank You

Tamanna Sharma 6 years, 1 month ago

Apply unitary method 0.625

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ANSWER

Walden conversion

Posted by Tamanna Sharma 6 years, 1 month ago

CBSE > Class 12 > Chemistry

6 answers

Tamanna Sharma 6 years, 1 month ago

Peshal you are right ,but as I search from Google ,many times it doesn't give the straight forward answer ,but at this platform all 12 class students having common queries so beside my queries I also look at them.

0Thank You

Peshal Madhukar 6 years, 1 month ago

Tujhe itne doubt h @Tamanna_Sharma then why don't you clear them through google??

1Thank You

Tamanna Sharma 6 years, 1 month ago

Ok sorry, by mistake typing ?? don't be angry haa

1Thank You

Rajat Barwar 6 years, 1 month ago

What is walden conversion, I have heard of walden inversion.....???

1Thank You

Aditya Chauhan 6 years, 1 month ago

Oye ab kitna wait karaogi

1Thank You

Aditya Chauhan 6 years, 1 month ago

Since a molecule can form two enantiomers around a chiral center, the Walden inversion converts the configuration of the molecule from one enantiomeric form to the other. For example, in an SN2 reaction, Walden inversion occurs at a tetrahedral carbon atom.

1Thank You

ANSWER

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