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

One of the most common ways to allow both acetaldehyde and acetone to react with Tollen’s reagent. A silver mirror is formed when acetaldehyde reacts with Tollen’s reagent. No such compound is formed on reaction of the agent with acetone. When acetone is subject to iodoform test, a precipitate is formed. There will be no such reaction when acetaldehyde is subject to iodoform test. Fehling’s reagent and chromic acid test can help in the identification of an acetaldehyde

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How can we convert haxane to benzene?

Posted by Divyansh Kumar 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Riya Mandal 7 years, 3 months ago

Hexane is treated with cr2o3 then we will get cyclohexene then by aromitization we will obtain benzene

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Elevation of boiling point of 1M Kcl solution is nearly double than that of 1M sugar solution

Posted by Vinod Thapa 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Divyansh Kumar 7 years, 3 months ago

More importantly, why? The reason is the . KCl dissociates into ions which affect like boiling point elevation and freezing point depression. The experimental factor for KCl is reported to be 1.85 (expected value from theory, if the salt was fully dissociated, would be 2), while the factor for solutes like sugar which don’t dissociate into separate ions is essentially 1.0. So the effect on the elevation of boiling point is proportional to the , and for KCl is almost double that of sugar, yes.

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Liquid is dispersed in solid give an example

Posted by Vinod Thapa 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Tikishree Menaka Murmu 7 years, 3 months ago

Jellies and cheese butter

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What is added to reduce the mpt. of alumina and also to increase its electrical conductivity?

Posted by Tanu Singh 7 years, 3 months ago

CBSE > Class 12 > Chemistry

3 answers

Sanjay Dahiya 7 years, 3 months ago

Ur wlcm

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Tanu Singh 7 years, 3 months ago

Nice? thank u...!

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Sanjay Dahiya 7 years, 3 months ago

Fluorospar and cryolite

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What is the difference between thermosetting and thermoplastic polymers?

Posted by Tanu Singh 7 years, 3 months ago

CBSE > Class 12 > Chemistry

6 answers

Aryan Rai 7 years, 3 months ago

Merry Christmas Tanu.

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Tanu Singh 7 years, 3 months ago

And Merry Christmas !

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Tanu Singh 7 years, 3 months ago

Ya thank u very much!

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Aryan Rai 7 years, 3 months ago

@Tanu.. hope this much information was enough ?. Though it is copy pasted from QUORA. And Merry Christmas.

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Aryan Rai 7 years, 3 months ago

Thermoplastic: Thermoplastics pellets soften when heated and become more fluid as additional heat is applied. The curing process is completely reversible as no chemical bonding takes place. This characteristic allows thermoplastics to be remolded and recycled without negatively affecting the material’s physical properties. There are multiple thermoplastic resins that offer various performance benefits, but most materials commonly offer high strength, shrink-resistance and easy bendability. Depending on the resin, thermoplastics can serve low-stress applications such as plastic bags or high-stress mechanical parts. Pros: Highly recyclable Aesthetically-superior finishes High-impact resistance Remolding/reshaping capabilities Chemical resistant Hard crystalline or rubbery surface options Eco-friendly manufacturing Cons: Generally more expensive than thermoset Can melt if heated

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Aryan Rai 7 years, 3 months ago

The primary physical difference is that thermoplastics can be remelted back into a liquid, whereas thermoset plastics always remain in a permanent solid state. Think of thermoplastics as butter – butter can be melted and cooled multiple times to form various shapes. Thermoset is similar to bread in that once the final state is achieved, any additional heat would lead to charring. Thermoset plastic: Thermoset plastics contain polymers that cross-link together during the curing process to form an irreversible chemical bond. The cross-linking process eliminates the risk of the product remelting when heat is applied, making thermosets ideal for high-heat applications such as electronics and appliances. Thermoset plastics significantly improve the material’s mechanical properties, providing enhances chemical resistance, heat resistance and structural integrity. Thermoset plastics are often used for sealed products due to their resistance to deformation. Pros : More resistant to high temperatures than thermoplastics Highly flexible design Thick to thin wall capabilities Excellent aesthetic appearance High levels of dimensional stability Cost-effective Cons: Cannot be recycled More difficult to surface finish Cannot be remolded or reshaped

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Give some imp conversions

Posted by Priyanshu Chandola 7 years, 3 months ago

CBSE > Class 12 > Chemistry

0 answers

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What do you mean by the term gold number?

Posted by Pawan Kumawat 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Tanu Singh 7 years, 3 months ago

The amount of lyophilic colloid in milligrams that will just prevent the ppt. of 10ml of a gold sol. on addition of 1ml of 10%NaCl is called gold number.

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Which is the best method for preparation of Ethers?

Posted by Pawan Kumawat 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Sanjay Dahiya 7 years, 3 months ago

Willimanson synthesis

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What is the role of anhydrous zncl2 in Lucas test?

Posted by Pawan Kumawat 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Divyansh Kumar 7 years, 3 months ago

HCl is less reactive with alcohols since the bond between H and Cl is a bit stronger than HBr and HI. Hence its reaction with alcohols need a catalyst ZnCl2, which helps in breaking the bond between H and Cl. Sometimes, as with primary alcohols, heating is required to achieve this along with ZnCl2.

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What is the iupac of picric acid?

Posted by Pawan Kumawat 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Amreen Fatma 7 years, 3 months ago

2,4,6-tri nitro phenol

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In which name reaction there is no need of alpha hydrogen atom...?

Posted by Tanu Singh 7 years, 3 months ago

CBSE > Class 12 > Chemistry

4 answers

Tanu Singh 7 years, 3 months ago

Ok good and thanks for telling.....☺

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Tanu Singh 7 years, 3 months ago

Then tell

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Amreen Fatma 7 years, 3 months ago

Its canizzaro reaction?

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Amreen Fatma 7 years, 3 months ago

I know

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Which type of detergent is used in liquid dishwashing soaps?

Posted by Amreen Fatma 7 years, 3 months ago

CBSE > Class 12 > Chemistry

4 answers

Vishali Raina 7 years, 3 months ago

Non ionic detergents

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Sanjay Dahiya 7 years, 3 months ago

Anionic detergents

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Amreen Fatma 7 years, 3 months ago

? ? ?

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Pawan Kumawat 7 years, 3 months ago

Surf excel

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In which name reaction there is no need of alpha particles...?

Posted by Tanu Singh 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Srivinayak V 7 years, 3 months ago

Cannizaro reaction

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What is the coordination number of unit cell having packing efficiency 68 percent?

Posted by Pawan Kumawat 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Srivinayak V 7 years, 3 months ago

Co ordination number is 2..... Its a bcc structure..... a=4r/3 ^2

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The drug which is used as both analgesic and antipyretics

Posted by Amreen Fatma 7 years, 3 months ago

CBSE > Class 12 > Chemistry

6 answers

Amreen Fatma 7 years, 3 months ago

1Thank You

Tanu Singh 7 years, 3 months ago

1Thank You

Amreen Fatma 7 years, 3 months ago

Both are right

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Pawan Kumawat 7 years, 3 months ago

I think it's paracetamol

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Tanu Singh 7 years, 3 months ago

Am I right....?

2Thank You

Tanu Singh 7 years, 3 months ago

Aspirin

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Why aniline does not undergo friedal crafts alkylation?

Posted by Pawan Kumawat 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Vishali Raina 7 years, 3 months ago

Because aniline formas salt with aluminium chloride which is used as catalyst in the alkylation or acylation reaction.

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Out of chloro bengene and benzyl chloride which form easily compound with aq NaOH

Posted by Priya Nshi 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Pawan Kumawat 7 years, 3 months ago

Hey Priya in Chlorobenzne there's a double bond character in c-cl bond due to resonance in benzene so it is more stronger and in Benzyl chloride the chlorine Atom is not directly attached to benzene further it is attached to alkyl group so it is easy to break it rather than breaking the c-cl bond in benzene so Naoh reacts easily with it.

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Helo alkane and helo arene

Posted by Vaibhav Jha 7 years, 3 months ago

CBSE > Class 12 > Chemistry

0 answers

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????What is peptisation❓❓❓

Posted by Yo Yo Honey Singh ? 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 7 years, 3 months ago

Peptization: Peptization may be defined as the process of converting a precipitate into colloidal sol by shaking it with dispersion medium with a small amount of electrolyte. The electrolyte used for this purpose is called peptizing agent. when ferric chloride is added to ferric hydroxide precipitate, the precipitate of hydroxide changes to sol by adsorbing ferric ions. Fe³⁺ is absorbed on Fe(OH)₃ and breaks into colloids.

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?Why is the single N-N Bond weaker than single P-P bond ❓❓❓ ??????

Posted by Yo Yo Honey Singh ? 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 7 years, 3 months ago

N-N single bond is weaker than P-P bond due to smaller size of N as compared to P. Smaller size of N leads to smaller N-N bond length. As a result, the lone pair of electrons on the both the N atoms repel each other leading to unstability or weakening of N-N bond. Because of larger size of P atom, P-P bond length is more and lone pair-lone pair repulsion between P atoms is less which makes the P-P bond stronger than N-N bond.

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??????Why H2S has lower boiling point than NH3 ❓❓❓??????

Posted by Yo Yo Honey Singh ? 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Rohit Goraya 7 years, 3 months ago

Due to hydrogen bond present in NH3

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????Why is NH3 more basic than PH3❓????

Posted by Yo Yo Honey Singh ? 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 7 years, 3 months ago

Ammonia is a stronger base than phosphine because in ammonia the central atom Nitrogen is smaller hence electron density is concentrated with in smaller range and easily available. Whereas in the case of phosphine the size of phosphorous is large electron cloud is distributed in large area and not easily available.

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Formula of zigler natta

Posted by Gud Luck ? 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Sanjay Agarwal 7 years, 3 months ago

triethylaluminium and titanium tetrachloride.. TiCL4+ ( C2H5) 3AL

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????What is peptide linkage ❓❓❓????. CBSE 2010 ALL INDIA

Posted by Yo Yo Honey Singh ? 7 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 7 years, 3 months ago

Peptide linkage: a peptide bond is a chemical bond formed between two molecules when the carboxyl group of one molecule reacts with the amino group of the other molecule, releasing a molecule of water (H₂O). This is a dehydration synthesis reaction (also known as a condensation reaction) and usually, occurs between amino acid. Peptide linkage is responsible for the primary structure of protein.
A peptide bond is a chemical bond formed between two molecules when the carboxyl group of one molecule reacts with the amino group of the other molecule, releasing a molecule of water (H₂O). This is a dehydration synthesis reaction (also known as a condensation reaction) and usually, occurs between amine. Peptide linkage is responsible for the primary structure of protein.

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????How will you convert methyl magnesium bromide to ethanoic acid ❓?????. CBSE 2017 FOREIGN

Posted by Yo Yo Honey Singh ? 7 years, 3 months ago

CBSE > Class 12 > Chemistry