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Meenakshi Sangwan 6 years, 11 months ago

Sulphur partially exist as S2 molecule which has 2 unpaired electron ..

ANSWER

the order of acidic strenght in amine and why 3 degree amine is not most acidic in amine

Posted by Harsh Shukla 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Nitesh Kumar 6 years, 11 months ago

1degree>2 degree>3degree 3degree amine is not most acidic because it have 3 donating groups attached which increase electron density on N-atom

ANSWER

is CCL4 exist if not, why it is not exist

Posted by Harsh Shukla 6 years, 11 months ago

CBSE > Class 12 > Chemistry

3 answers

Raunak Himmatramka 6 years, 11 months ago

It exist and also used as a solvent in halogenation of alkene

Simran Baidwan 6 years, 11 months ago

CCl4 exist

Tannu Rani 6 years, 11 months ago

Ccl4 exist

ANSWER

Why phenoxide is react with CO2 not phenol in kolbe's reaction?

Posted by Ahmad Reza 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Robins Kumar Dinkar 6 years, 11 months ago

Because phenoxide ion is resonance stabilised to benzene ring while phenol is not.

ANSWER

calculate the freezing point of a solution 0.05m solution of al2(so4)3 assumingvit is completely ionized

Posted by Divyansh Kumar 6 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is galvanic cell

Posted by Ravindra Singh 6 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Nitesh Kumar 6 years, 11 months ago

cell is an electrochemical cell that uses the transfer of electrons in redox reactions to supply an electric current. This cell is driven by a spontaneous chemical reaction that produces an electric current through an outside circuit. Galvanic cell reactions supply energy, which is used to perform work. For this reason, galvanic cells are commonly used as batteries. In the real world, the word battery has come to include a single galvanic cell, but a proper battery consists of multiple cells. A galvanic cell consists of at least two half cells, a reduction cell and an oxidation cell. Chemical reactions in the two half cells provide the energy for the galvanic cell operations. Many galvanic cells are of commercial importance. These include dry cells, mercury cells, rechargeable Ni-Cd batteries, fuel cells and lead storage cells. A common galvanic cell is the Daniell cell.

Meenakshi Sangwan 6 years, 11 months ago

Which derives electrical energy from spontaneous redox reaction taking place within the cell

ANSWER

Properties of ammonia

Posted by Ayush Chauhan 6 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Can you provide viva question for practical which can help us to answer confidently

Posted by Meet Bhawsar 6 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

I want the marking scheme chapter wise please provide me

Posted by Rupesh Bhagwane 6 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Can you explain why is bimolecular dehydration not appropriate for the preparation of ethyl methyl ether???

Posted by Shubhankar Kumar 6 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is dispersed phase?

Posted by Shreya Singh 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Shubhankar Kumar 6 years, 11 months ago

As we know , In true solutions-----the substance which dissolved is called the solute and medium in which the substance is dissolved is called solvent. Similarly, in collidal system ,the turm solute &solvent is replaced by the terms dispersed phase & dispersion medium. (Solute ----- dispersed phase ) && (Solvent ------ dispersion medium).

ANSWER

Why KMno4 compound make coordinate bond

Posted by Vishvajeet Rathi 6 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Bond angle in NH3 is less than in PH3. why

Posted by Gangeshver Sharma 6 years, 11 months ago

CBSE > Class 12 > Chemistry

4 answers

Raunak Himmatramka 6 years, 11 months ago

This is due to drago rule

Shubhankar Kumar 6 years, 11 months ago

The questions should be----why bond angle in PH3 is less than in NH3??

Shubhankar Kumar 6 years, 11 months ago

The bond pair in NH3 is close to N in N-H bond than the bond pair in P-H bond in PH3 . This is because the size of the nitrogen is small than phosphorus . As a result , the force of repulsion between the bonded pair of electrons in PH3 is more than in NH3 . Therefore the bond angle in PH3 molecule lesser than in NH3 .

Ashwini Kumar Mohanty 6 years, 11 months ago

In ph3 due to dragos hypothesis bond angle is aprox 90

ANSWER

Describe freundlich adsorption isotherm

Posted by Inzamamul Haqud 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Robins Kumar Dinkar 6 years, 11 months ago

A/c to this:X/M= K.(P)^1/n

ANSWER

Is previous 10 years PAPERS are enough for scoring 90 marks in pcm?

Posted by Ankit Bahu 6 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Archit Kumar 6 years, 11 months ago

It depend on your knowledge about a topic but the pattern of questions are somewhat same so if u do last 10 year question very dedicatedly the you will score more than 80 percent

Deepak Jindal 6 years, 11 months ago

Yess

ANSWER

Define cationic detergent. In short

Posted by Akshat Mishra 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 11 months ago

Cationic detergents are quarternary ammonium salts of amines with acetates, chlorides or bromides as anions. Cationic part possess a long hydrocarbon chain and a positive charge on nitrogen atom. Hence, these are called cationic detergents. Cetyltrimethylammonium bromide is a popular cationic detergent and is used in hair conditioners.

ANSWER

Which previous year questions paper we have to solve to take a good marks on 2019 exam

Posted by Rohit Roy 6 years, 11 months ago

CBSE > Class 12 > Chemistry

3 answers

Nitesh Kumar 6 years, 11 months ago

Arihant or oswal

Nivedita Vishwakarma 6 years, 11 months ago

Arihant

Vicky . 6 years, 11 months ago

DiSha publication

3Thank You

ANSWER

Why water is more acidic than alcohol?

Posted by Kshitij Bajpai 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 11 months ago

Ethanol is an alcohol. Alcohols, in general are weaker acids than water. This is because the OH group in alcohols is less polar than the OH group in water. The electron releasing nature of the R group in alcohols decreases the polarity of the OH bond, leading to decrease in acid strength of alcohols. As a result, water is a better proton donor than alcohol. Also, the alkoxide ion is a better proton acceptor than the the hydroxide ion, suggesting that the alkoxides are stronger bases.

5Thank You

ANSWER

Some Examples of electrophiles and nucleophiles

Posted by Kshitij Bajpai 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 11 months ago

Nucleophiles: A nucleophile is a species (anion or a molecule) which is strongly attracted to a region of positive charge.
Nucleophiles are either fully negative ions or have a strong –ve charge. Common nucleophiles are hydroxide ions, cyanide ions, water and ammonia.
Notice that each of these contains at least one lone pair of electrons either on an atom carrying a full negative charge or on a very electronegative atom carrying a substantial-charge.

Electrophile: A electrophile is a species (cation) which is electron deficient hence attacked by negatively charged or electron rich species.
It participated in a chemical reaction by accepting an electron pair from nucleophile.
common electrophiles are Cl+, NO²⁺, HSO³⁺ etc.

3Thank You

ANSWER

Why does the lead acetate paper turn shinning black in the test of sulphide?

Posted by Nitin Chaudhary 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Vicky . 6 years, 11 months ago

By the formation of lead sulphide

ANSWER

Why are certain drugs called enzyme inhibitors?

Posted by Nikhil Singh 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Abc Kamboz 6 years, 11 months ago

These drugs interfere with the active site present on enzymrs

ANSWER

Both antacids and antiallergic drugs are antihistamines but they cannot replace each other.Explain why?

Posted by Nikhil Singh 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Abc Kamboz 6 years, 11 months ago

Because they act on different receptors

ANSWER

Faraday's first law?

Posted by Kshitij Bajpai 6 years, 11 months ago

CBSE > Class 12 > Chemistry

3 answers

Tannu Rani 6 years, 11 months ago

Faraday's first law states that- Mass of the substance deposited on the surface of electrode is directly proportional to the amount of charge flowing in the circuit ...... M=Z×Q where z is electrochemical equivalent (a constant) As Q=it and z=equivalent weight÷96500

Kshitij Bajpai 6 years, 11 months ago

Not in physics,in chemistry

Abc Kamboz 6 years, 11 months ago

Acc to faraday first law whenever magnetic flux linked with a coil changes emf gets induced in it

ANSWER

What is kirchoffs rule

Posted by Rupesh Kumar 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Abc Kamboz 6 years, 11 months ago

Current entering the junction is equal to the current that is leaving

ANSWER

What is tendall reagents

Posted by Dharmesh Kumar 6 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

what are the tertioary protein?? and thier type

Posted by Prachi Tyagi 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 11 months ago

This is the structure that gives protein the 3-D shape and formation. After the amino acids form bonds (secondary structure) and shapes like helices and sheets, the structure can coil or fold at random. This is what we call the tertiary structure of proteins. If this structure is disrupted or disturbed a protein is said to be denatured which means it is chemically affected and its structure is distorted.