A crystal or crystalline solid is a solid material whose constituents are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. Examples - Diamonds, metals, salts etc.

The process of refining Nickel is called the Mond Process. It is also called the Carbonyl process and is one of the Nickel refining processes. Nickel usually comes in the form of Nickel oxide along with other impurities. A mixture of Hydrogen gas and Carbon monoxide gas is added to the nickel and this process is called syngas. Now the Carbonmonoxide reacts with the impure nickel. Only nickel reacts readily with CO unlike other metals. While the impurities remain solids, Nickel and carbonmonoxide together form Nickel Carbonyl gas. When this Nickel Carbonyl gas is heated, it decomposes to form pure nickel and carbon monoxide.

When aniline treated with bromine water, the bromine water gets decolourized and white precipitate is formed. This reaction results in the formation of 2,4,6-tribromo phenylamine. This reaction is an example of bromination.

Hope this information helps you.

NCERT most important. NCERT should be on your fingertips. Other than that, for reference, use OP Tandon and MS Chouhan.

Practice previous year questions MANY TIMES . Become perfect in them. Solve other people’s doubts. These will help you score better. You should focus on limited material and do it more number of times !! Many questions ask only basic concepts. Self study is definitely most important. But coaching really helps you score more and you can also appear for a test series and analyse it properly (Giving 2–3 hours), find your strong points and chapters, work on them.

Hello Bhargavi,

As you wanted to know; Nitrogen is the chemical element with the symbol N and atomic number 7.

It was first discovered and isolated by Scottish physician Daniel Rutherford in 1772. It has a mass number 14.057 .

Other important characteristic of it can be described as ; Nitrogen undergoes chemical reaction with itself to form N2.

Hope this helps!

This reaction is called dehydration of alcohol and the products usually formed are alkene and water. The products will be CH3CH=CH3 +H2O .

To understand this you have to understand the Saytzeff rule - hydrogen is eliminated from that carbon atom which has less number of hydrogen atoms attached to it. Thus the above reaction proceeds as given.

Mechanism - 1. Attachment of proton to alcoholic oxygen

2. Removal of H2O molecule

3. Removal of proton

As Al2O3 is a strong oxidising agent the reaction mechanism goes in same way as with H2SO4 / Heat.

Hi,

The formula is C10H7OH; there are 9 possible ways to draw 1-nepthol resonance structure.

Dear student

Do not worry about being bad in physics. You need to get atleast 33% marks in each subject to pass in board exams. If you do well in your practical exams and then score 40-50 marks in physics you can pass in physics easily. After 12th you can opt for any couse which does not include physics. Some  BSc colleges provide you subject combination options such as ZCB( zoo, chem, botany) ZCM( zoo, chem, maths) etc., You can opt for any of them and make your career.  After BSc you get the placement opportunities in the same college sometimes. You can even go for fields other than science such Arts and Commerce ( where you get maths as an option or a major subject). If you are interested in literature related field go for arts. There are various other career options apart from this such as mass communication, computer science, forensics, economics, hotel management, and the list doesn't end. So, relax and focus on your boards first and then choose your field according to your wish. The thing which matters the most is, you should love what you do then only you will succeed in life.

All the best.

Hello Sambit

A 50% concentrated NaOH solution is generally used in Cannizaro reaction as it is used for aldehydes which do not have α-H. (There are a few exceptions though) In normal aldol condensation, alpha hydrogens are more acidic so a weaker base can abstract it. But it is not in the case in this reaction that is why a concentrated/stronger base is required.