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

Ask questions which are clear, concise and easy to understand.

Ask Question

Explain the chemical behavior of alcohols and phenols when they dissolved in water

Posted by Tushar Kanojia 7 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is n type semiconductor

Posted by Yash Bhardwaj 7 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Ayush Kumar Gupta 7 years, 2 months ago

The semiconductors which are doped with group 15 elements are called n type semiconductors.

0Thank You

ANSWER

Why 24carrot gold is not used for jewellery but 22 carrot. Why

Posted by Chaudhary Sansanwal 7 years, 2 months ago

CBSE > Class 12 > Chemistry

4 answers

Shaista Parveen 7 years, 2 months ago

24 karat gold is not used in making jewelry or wearing ornaments because it is very smooth and it can react with The gases present in our environment because it has no stability as you know stability is inversely proportional to reactivity so it is less stable it can react with the environment but 22 karat gold is not that much of reactive as it is more stable than 24 carat so that is used for or ornaments

0Thank You

Kanika Sharma 7 years, 2 months ago

Because 24 carat gold is in pure form and it is too soft in nature so that 's why it is not used to make jewellery but 22 carat gold is hard and can be set according to our design that is in making jewellery

1Thank You

Mohit Sepat 7 years, 2 months ago

Its not carrot

1Thank You

Anjana Sherawat 7 years, 2 months ago

I think it is present as a soft solid which can't be used to make jewellery

2Thank You

ANSWER

Didderence between metel and non metal

Posted by Sid Kumar 7 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Naman Khare 7 years, 2 months ago

Metals are the substance which lose their electron. And non - metals are the substance which gains electron.

0Thank You

Ayush Kumar Gupta 7 years, 2 months ago

Metal conduct electricity, heat due to free electrons but non metals do not conduct electricity heat due to absence of free electron

0Thank You

ANSWER

A solution is prepared by dissolving 60 gram of ch3oH to 120 gram of water.;then calculate the mole fraction of methyl alcohol and water

Posted by Sneha Kumari 7 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Kritika Chaudhary 7 years, 2 months ago

let molefraction of methyl alcohol be X1 and that of water beX2 total mass of CH3OH=12+3+16+1=32g H2O=2+16=18 X1=32/18+32 32/50=.64 X2=18/50=.36

1Thank You

ANSWER

What is vendarwall force

Posted by Abhishek Kumar 7 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Raj Singh 7 years, 2 months ago

Force acting between two non polar molecule

0Thank You

Manoj Kumar 7 years, 2 months ago

It is the force of attraction between two molecules of gases which is weak because the distance between two molucles of gases is larger hence the force of attraction between them is weak

1Thank You

ANSWER

Which state of cr is most stable +1 or +2

Posted by Rajan Pathak 7 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Rajan Pathak 7 years, 2 months ago

Why shaista have you any reason

0Thank You

Shaista Parveen 7 years, 2 months ago

2Thank You

ANSWER

What is atomization how it affect stability and which element show high atomization and how

Posted by Jasmine Manku 7 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

In atmosphere, there exist both oxygen and hydrogen.why can't we get water from it?

Posted by Jshri Prabhakar 7 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Anjana Sherawat 7 years, 2 months ago

Temperature and pressure conditions are different for the reaction between oxygen and hydrogen

2Thank You

ANSWER

Explain bonding in metal carbonyls ??

Posted by Neha Yadav 7 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Aditya Roy 7 years, 2 months ago

A simple model is proposed for analyzing and assigning the infrared-active carbonyl stretching frequencies of simple and substituted metal carbonyls of the type ML,(CO) &,, that is, those with an essentially octahedral distribution of the ligands, L, and carbonyl groups about the metal atom. The model involves qualitative and semiquantitative inferences from valence theory as to the signs and relative magnitudes of CO stretching force constants and the coefficients of quadratic interaction terms coupling the stretching motions of different CO groups

0Thank You

ANSWER

Functinal group in CH3COCl ?

Posted by Sagar Choubey 7 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Dhanjeet Chahal 7 years, 2 months ago

Halogen -- chloro

0Thank You

ANSWER

atomic no of sodium

Posted by Jaspreet Gill 7 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Pooja Dalal 7 years, 2 months ago

Atomic number of sodium is 11

3Thank You

ANSWER

What is the IUPAC name of CH3COCl ?

Posted by Sagar Choubey 7 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 7 years, 2 months ago

Ethanoyl chloride is the formal IUPAC name - more commonly known as acetyl chloride. Halide derivative of acetic acid that readily hydrolyses back to HCl and CH₃COOH in air - as such it’s doesn’t exist in nature and has to be synthesised in the lab for use as a chemical precursor to esters and amides of acetic acid.

3Thank You

ANSWER

What is hydro mettalurgy

Posted by Sanjana Gupta 7 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Komal Kundaliya 7 years, 2 months ago

It is phenomenon in which we separate the Ganges particle from the ore using water

0Thank You

ANSWER

Why nickel has highest negative hydration enthalpy

Posted by Vishal Vishal 7 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Anybody know about any book which have 100 mcq or more to practice ch wise for neet of all sub....??

Posted by Isha Ahuja 7 years, 2 months ago

CBSE > Class 12 > Chemistry

4 answers

Mohit Sepat 7 years, 2 months ago

Disha

0Thank You

Isha Ahuja 7 years, 2 months ago

Thnku

0Thank You

Kartik Karadm 7 years, 2 months ago

Dr.Ali or True man biology

1Thank You

Yagyesh Dubey 7 years, 2 months ago

Take magzines for che phy & math for neet prerpation

2Thank You

ANSWER

What is collodion ?

Posted by Vishwajeet 7 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Isha Ahuja 7 years, 2 months ago

It is a 4%solution of nitro cellulose in a mixture of alcohol and ether

4Thank You

ANSWER

Why do we need to classify drugs in different ways

Posted by Rohit Goswami 7 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Princesses Kaur 7 years, 2 months ago

Due to their properties

1Thank You

ANSWER

Difference bt solution or solvent

Posted by Baldev Prajapati 7 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Princesses Kaur 7 years, 2 months ago

Soln is mixture of solvent and solute Solvent is the larger quantity present in soln

1Thank You

Princesses Kaur 7 years, 2 months ago

In chapter 1

1Thank You

ANSWER

Why diomond can not form in shape of circle?

Posted by Vicky Singh 7 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Princesses Kaur 7 years, 2 months ago

Due to formation of bonds of carbon And due to formation of bonds it is hard

1Thank You

ANSWER

Meaning of chemical kinetic

Posted by Ashishpratap Singh 7 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Naman Rahar 7 years, 2 months ago

Branch of physical chemistry which deals with the rate of reaction, mechanism of reaction, factors affecting rate of reaction .

1Thank You

ANSWER

Describe the mechanism of the addition of Grignard reagent to the curve slope of compound to form an adequate and hydrolysis and alcohol

Posted by Vikash Kumar 7 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Juhi Singh 7 years, 2 months ago

Study chemistry ncert

0Thank You

ANSWER

How catalytic reduction of butanal is carried out

Posted by Aditi Atole 7 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Why nitrogen exists as gas?

Posted by Prabhath Vamshi Kausthub 7 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 7 years, 2 months ago

The size of nitrogen is quite small. As a result two nitrogen atoms can be linked to each other by three covalent bonds in order to complete the octets of both the nitrogen atoms. This diatomic molecule N₂ is very stable and has very negligible attraction towards other diatomic nitrogen molecules. Thus there is weak interaction between nitrogen molecules. So nitrogen exist as gas.

0Thank You

ANSWER

What happen when ethanol react with copper at 573K

Posted by Palkin Jaswal 7 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 7 years, 2 months ago

Alcohols are oxidised by passing their vapours over hot copper at 573K. Primary alcohol (1°) undergo dehydrogenation to give aldehyde, secondary alcohol (2°) undergo dehydrogenation to give ketone and tertiary alcohol (3°) undergo dehydration to give alkene.
For example ,

0Thank You

ANSWER

What is psuedo unimolecular reaction? Explain its first order reaction

Posted by Prince Yadav 7 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 7 years, 2 months ago

A reaction which is not first-order reaction naturally but made first order by increasing or decreasing the concentration of one or the other reactant is known as Pseudo first order reaction. Pseudo means ‘fake’. Therefore, it is clear from the name itself that it is not first-order reaction by nature. The order of reaction is made one by altering certain conditions.
Example:
CH₃COOC₂H₅ + H₂O → CH₃COOH + C₂H₅OH

0Thank You

ANSWER

Element of group 16 show lower value of first ionisation enthalpy as compared to group 15

Posted by Ajay Meena 7 years, 2 months ago

CBSE > Class 12 > Chemistry