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The most abundant metal in the earth's crust is .................

Posted by Sourabh Tetarwal 8 years, 3 months ago

1 answers

Naveen Sharma 8 years, 3 months ago

Aluminum is the most abundant metal in the earth's crust, it is never found free in nature. All of the earth's Aluminum has combined with other elements to form compounds.

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which are the order of acid strength of the following acid

Posted by Shakila Khan 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Amorphous is anisotropic in nature why

Posted by Ritik Punia 8 years, 3 months ago

CBSE > Class 12 > Chemistry

3 answers

Akshay Singh 8 years, 3 months ago

Hence they are isotropic in nature

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Sneha Dwivedi 8 years, 3 months ago

Because they are isotropic in nature

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Akshay Singh 8 years, 3 months ago

Because they have no long form structure

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If Cu2+ + 2e= cu and E=0.34, Cu+ + e= Cu and E = 0.52 find E for cu2+ +e= Cu+

Posted by Manu Singh 8 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Utsav Soni 8 years, 3 months ago

-0.18

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Neha Garg 8 years, 3 months ago

0.18V

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How to convert into benzyl alcohol

Posted by Mayank Adhikari 8 years, 3 months ago

CBSE > Class 12 > Chemistry

0 answers

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What is hypnotics

Posted by Kashi Nagar 8 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Neha Garg 8 years, 3 months ago

Actually hypnotics is that phenomenon by which one can easily control one's mind and can force him to do various kinds of things

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Chemisorption is a type of adsorption, then why is it increases with increase in temperature

Posted by Swati Kumari 8 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Neha Garg 8 years, 3 months ago

In Chemiosoruption activation energy is required to change the reactant into product. On increasing tempreture the goven energy acts as activation energy for the process and hence increases the rate of reaction and hence Chemiosoruption also increaaes.

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What is isomorph

Posted by Shruti Gupta 8 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Neha Garg 8 years, 3 months ago

A substance or organism that exactly corresponds in form with another

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What is meant by vapour pressure of solid solvent??

Posted by Shivani Maan 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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As I have studied earlier that 3rd shell hold 8 electrons but now I am studing that 3rd shell hold 18 and 4th hold 36 can u plz explain me in breif and properly and can plz explain me in hindi

Posted by Chetan Joshi 8 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Mohit Soni 8 years, 3 months ago

3rd shell i.e. m shell has three subshells s,p,d which further contains 1,3,5 orbitals respectively and each orbitals with 2 elctrons ,overall (2×1)+(2×3)+(2×5)=2+6+10=18 . Similarly 4th the n shell one more subshell-f is added which contains 7 orbitals containing 14 electrons +18 of s p d giving 32 electrons.

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Why dehydration of alcohols is temperature dependent?

Posted by Kanan Joshi 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Table for nomenclature

Posted by Mohit Bansal 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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2degree alcohol. Change into 1 degree alcohol

Posted by Siddhant Gupta 8 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Kanan Joshi 8 years, 3 months ago

1. DeHydration 2. Hydration by hydroboration reaction

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Srashti Tripathi 8 years, 3 months ago

Put the alcoholic group on first carbon atom.. To make it 1 degree alcohol....

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What is hygroscopic ???

Posted by Prachi Nikhare 8 years, 3 months ago

CBSE > Class 12 > Chemistry

0 answers

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Chemical structure of carbon mono oxide?

Posted by Somu Keshri 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Oxo acid of phosphorus

Posted by Naman Jain 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Dishcharge tube experiments

Posted by Tushar Tyagi 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Properties of the baking soda

Posted by Subashni Chandran 8 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Amar Kumar 8 years, 3 months ago

Sodium bicarbonate is odorless, not to attempt to smell this chemical as inhalation may cause sneezing and coughing.
Sodium bicarbonate is a white, water-soluble powder. It is soluble at 7.8 grams of powder to 100 grams of water. The powder is extremely fine and has a crystalline shine.
The density of sodium bicarbonate is 2.159 grams per cubic centimeter.
The melting point of sodium bicarbonate is 60 degrees Celsius, or 140 degrees Fahrenheit. This chemical does not have a boiling point, nor does it have a flash point as it is non-combustible. It will decompose at temperatures over 70 degrees Celsius.
On the pH scale from zero to 14, sodium bicarbonate lies at 8.2. This substance is a base (or alkaline).
Sodium carbonate is a stable chemical as long as it is stored properly. When combined with certain acids, such as monoammonium phosphate or a sodium-potassium alloy, a dangerous amount of carbon dioxide is created. It is recommended to avoid moisture and heat when storing.

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What is electron gain enthalpy?

Posted by Ankit Singh 8 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Amar Kumar 8 years, 3 months ago

Electron gain enthalpy : the energy released when a neutral isolated gaseous atom accepts an extra electron to form the gaseous negative ion i.e. anion.It is denoted by Δ eg H. Greater the amount of energy released in the above process, higher is the electron gain enthalpy of the element.

The electron gain enthalpy of a element is a measure of the firmness or strength with which an extra electron is bound to it.
Electron gain enthalpy is measured in electron volts per atom or kJ per mole.

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Raveesh Yadav 8 years, 3 months ago

Energuy change takes place when an electron is added to the outer most shell of an gaseous atom

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About partial pressure

Posted by Richa Hajowary 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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handry schuz rule

Posted by Shivam Sharma 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Alkyle halide when react with KNO2 it gives R-ONO where as when it react with AgNO2 it gives R-NO2.Why?

Posted by Vaibhav Kumar 8 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Arti Kumari 8 years, 3 months ago

KNO2 is ionic so in solution both nitrogen and oxygen can donate electron but oxygen is more electronegative hence forms more stable bond. Whereas AgNO2 is covalent so only nitrogen is available to donate electrons.

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Ligand

Posted by Marwein Mawlong 8 years, 3 months ago

CBSE > Class 12 > Chemistry

1 answers

Shirin Kalam 8 years, 3 months ago

The molecule or ion which surrounds the central metal atom is called ligand.eg [Co(NH3)6]3+ here the ligand is NH3

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How we can find amorphous and crystalline

Posted by Rebekal Jahangir 8 years, 3 months ago

CBSE > Class 12 > Chemistry

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Distinguish between aldehyde and carboxylic group

Posted by Vivek Thak 8 years, 3 months ago

CBSE > Class 12 > Chemistry

2 answers

Arti Kumari 8 years, 3 months ago

Aldehydes gives tollens reagent test to give Ag whereas carboxylic group do not Carboxylic gr reacts with NaHCO3 to give brisk effervescence due to release of CO2 whereas Aldehydes do not.

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Vikas Sain 8 years, 3 months ago

Carboxylic is carbonyl group on other hand aldehyde not.

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A compound is formed a substituton of two chlorine for two hydrogen in propane the number of possible isomeric compounds is

Posted by Priya Priya 8 years, 3 months ago

CBSE > Class 12 > Chemistry