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Bhailog tmlog jee ka preparation kahan se kr rhe ho kon se lectures kr rhe ho main ab krna chahta hun hoga ya nhi kaise hoga

Posted by Rounak Anand 2 months, 1 week ago

Entrance Exam > JEE main > Chemistry

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Vivek Bharti 1 month, 3 weeks ago

Mai Unacademy plus subscription liya hu wahi se kr rha hu bro

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importance of quantum numbers and electronic configuration of periodicity of elements

Posted by Epistemophile . 4 months ago

Entrance Exam > JEE main > Chemistry

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Chadwick discovered protons by bombarding a thin sheet of beryllium by Alpha particles when electrically neutral particles having mass slightly greater than that of protons were emitted. What actually was the reason behind this bombarding ?

Posted by Epistemophile . 4 months, 1 week ago

Entrance Exam > JEE main > Chemistry

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If electronegativity of H and Cl are 2.1 and 3 respectively and bond length of H2 & Cl2 are 0.74A⁰ & 1.98 A⁰ respectively, then calculate the internuclear distance of HCl molecule.

Posted by Epistemophile . 4 months, 2 weeks ago

Entrance Exam > JEE main > Chemistry

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If electronegativity of H and Cl are 2.1 and 3 respectively and bond length of H2 & Cl2 are 0.47A⁰ & 1.98 A⁰ respectively, then calculate the internuclear distance of HCl molecule.

Posted by Epistemophile . 4 months, 2 weeks ago

Entrance Exam > JEE main > Chemistry

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Epistemophile . 4 months, 2 weeks ago

Sorry I've posted the Q. with incorrect data

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ag107 ag 109 if avg isotopic mass is 1080.5 then calculate percentage of each isotope

Posted by Pari Jadhav 6 months, 1 week ago

Entrance Exam > JEE main > Chemistry

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Calculate the mass in grams 1) 6.022*10^23 atom of o2

Posted by Chethan .S 7 months, 1 week ago

Entrance Exam > JEE main > Chemistry

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What's the name of man made lanthanoid

Posted by Aman Rajput 8 months ago

Entrance Exam > JEE main > Chemistry

1 answers

Chethan .S 7 months, 1 week ago

Promethium `(Pm)`m

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Looking Around

Posted by Rayeen Tosib 10 months, 2 weeks ago

Entrance Exam > JEE main > Chemistry

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IUPAC name of (CH2OH)3C-CHO ?

Posted by Shivam Patil 10 months, 2 weeks ago

Entrance Exam > JEE main > Chemistry

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IUPAC name of 2,2,2-Trimethylhydroxy ethanal ?

Posted by Shivam Patil 10 months, 2 weeks ago

Entrance Exam > JEE main > Chemistry

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Difference between Average rate and Instantaneous rate.

Posted by Buangi Hmingchhuanmawii 1 year, 6 months ago

Entrance Exam > JEE main > Chemistry

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Sia ? 1 year, 6 months ago

Instantaneous Rate vs Average Rate
Instantaneous rate is the rate of a chemical reaction that is measured as the change of the concentration of reactants or products during a known time period.	Average rate is the rate of a chemical reaction that is measured as the change of the concentration of reactants or products during the whole time period of the progression of the chemical reaction.
Time
Instantaneous rate is measured for a particular moment or for a very short time period.	Average rate is measured for a longer time period.
Formula for Calculation
Instantaneous Rate of Change = Lim (t→0) [Δ(concentration of reactant or product) /Δ(time)]	Average Rate of Change = Δ(concentration of reactant or product) /Δ(time)

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What are the factors affecting rate of reaction?

Posted by Buangi Hmingchhuanmawii 1 year, 7 months ago

Entrance Exam > JEE main > Chemistry

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Shilpa Devi 1 year, 6 months ago

Temperature, pressure

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If edge length of cubic unit cell is a, face diagonal is √2a and body diagonal is √3a. Calculate the relationship between radius of presentation r and edge length when a) All lattice points along face diagonal are occupied. b) All lattice points on body diagonal are occupied.

Posted by Nishtha Bansal 1 year, 9 months ago

Entrance Exam > JEE main > Chemistry

1 answers

Ronak Padhan 1 year, 7 months ago

Not

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Matter

Posted by Raja M 1 year, 9 months ago

Entrance Exam > JEE main > Chemistry

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Aman Rajput 7 months, 3 weeks ago

It is a tiny partical of atom

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Sia ? 1 year, 8 months ago

Matter is everything around you. Atoms and compounds are all made of very small parts of matter. Those atoms go on to build the things you see and touch every day. Matter is defined as anything that has mass and takes up space (it has volume).

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Gives three examples of matter that sublimes

Posted by Vikram Kumar 2 years, 3 months ago

Entrance Exam > JEE main > Chemistry

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Aditi Dora 2 years ago

Camphor acetone napthlene

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Gaurav Seth 2 years, 3 months ago

The Changing of a solid directly into vapours on heating,and of vapours into solid on cooling is called as sublimation.

The solid substance which undergoes sublimation is called sublime.

The solid obtained by cooling the vapours of the solid called a sublimate.

For Ex:camphor,Iodine,Ammonium Chloride,Naphthalene etc.

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The size of particle is enough to scatter light and exhibit Tyndall effect

Posted by Hemlata Narang 2 years, 4 months ago

Entrance Exam > JEE main > Chemistry

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Meghna Thapar 2 years, 4 months ago

Tyndall effect can be defined as the scattering of a beam of light by colloidal particles present in a colloidal solution. This effect can be observed when a fine beam of light passes through a small hole in a dark room. This effect occurs due to the scattering of light by particles of dust or smoke present in the air.

The Tyndall effect can also be observed when sunlight passes through the canopy of a dense forest. In the forest, the mist contains tiny droplets of water which act as colloidal particles dispersed in the air.

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C11

Posted by Om Kadam 2 years, 4 months ago

Entrance Exam > JEE main > Chemistry

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Structure of the atom

Posted by Tse Ngodup 2 years, 5 months ago

Entrance Exam > JEE main > Chemistry

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Yogita Ingle 2 years, 5 months ago

An atom consists of heavy positively charged nucleus. The whole mass of the atom is concentrated in the nucleus.
The electrons in an atom revolve around the nucleus in definite circular paths called orbits or energy level.
Each energy level is associated with definite amount of energy.
The change in energy takes place when electron jumps from one energy level to another energy level.

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Atoms and molecules

Posted by Tse Ngodup 2 years, 6 months ago

Entrance Exam > JEE main > Chemistry

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What is the difference between acid and bases

Posted by Ashmita Ghimirey 2 years, 6 months ago

Entrance Exam > JEE main > Chemistry

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Gaurav Seth 2 years, 6 months ago

Acids	Bases
i) Acids are sour in taste.	i) Bases are bitter in taste.
ii) Acid turns blue litmus to red.	ii) Bases turn red litmus to blue.
iii) Acid is a substance which contains hydrogen ion H+.	iii) Bases are substances which contain hydroxyl ion OH−.

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Absorption spectra

Posted by Abhishek Kumar Mishra 2 years, 6 months ago

Entrance Exam > JEE main > Chemistry

2 answers

Vikhyat Bhati 1 year, 7 months ago

It is formed when white light is passed through a substance and transmitted light is analyzed by spectroscope. It gives dark lines on bright background. It is always discontinuous.

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Rishik Bhuvanesh 2 years, 6 months ago

It is formed when white light is passed through a substance and transmitted light is analyzed by spectroscope. It gives dark lines on bright background. It is always discontinuous.

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Which chapter is most important in chem.for12th?

Posted by Akshada Vaidya 2 years, 10 months ago

Entrance Exam > JEE main > Chemistry