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

See number of periods is the direction for teachers to guide them how many periods of school teaching they have to devote to that particular chapter or unit.

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About vesper theory

Posted by Shivansh Singh 8 years ago

CBSE > Class 12 > Chemistry

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Tanuja Biswas 8 years ago

See actually its not vesper theory we just cl it so while pronouncing it ...its actually vsepr theory. Its full form is valence shell electron pair repulsion theory. Its has a few postulates which is actually a part of class 11 curriculum ( chapter 4 chemistry class 11). In brief it basically helps us to deduce actual structures of molecules from their formulas and their deviation from expected structures by stating some rules for repulsion between the electrons. It basically tells us that bp- bp repulsion is weaker than bp- lp repulsion which is further weaker than lp - lp repulsion.lp stands fr lone pair of electrons i.e. valence shell electrons that do not participate in bonding and bp stands for bonded pairs of electrons that participate in bonding.

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Why non metal do not react with acids

Posted by Santu Kumar 8 years ago

CBSE > Class 12 > Chemistry

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What are misch metals

Posted by Pratyaksha Garg 8 years ago

CBSE > Class 12 > Chemistry

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Sea is greatest source of halogen. Explane

Posted by Sakshi Katre 8 years ago

CBSE > Class 12 > Chemistry

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Preeti Dabral 7 years, 11 months ago

Sea water contains chlorides, bromides, and iodides of Na, K, Mg, and Ca. However, it primarily contains NaCl. The deposits of dried up sea beds contain sodium chloride and carnallite, KCl.MgCl2.6H2O. Marine life also contains iodine in their systems. For example, sea weeds contain upto 0.5% iodine as sodium iodide. Thus, sea is the greatest source of halogens.

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Sea is the greatest source of halogen. explane?

Posted by Sakshi Katre 8 years ago

CBSE > Class 12 > Chemistry

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Halogens

Posted by Kostav Sharma 8 years ago

CBSE > Class 12 > Chemistry

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Sheena Kaushik 8 years ago

Group 17 elements

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What is stearic hindrance?

Posted by Deepika Kashyap 8 years ago

CBSE > Class 12 > Chemistry

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Tanuja Biswas 8 years ago

In a molecule, when different groups are attached in 3d space, they are oriented in different directions. Imagine on a football( the central atom), u paste different sized small balls( attached groups) at different locations on the football. Then if another balls comes to attack at the "football", there will be an hindrance in doing so from that location where a small ball is pasted. This type of hindrance faced by attacking reagents on attacking a specific molecule in a 3d space is called steric(means in space) hindrance. On molecular level, steric hindrance not only comes due to physical presence of groups but also due to the repulsion these groups offer.?

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Geometry and magnetic behaviour according to {Cu(NH3)4}2+.

Posted by Dhanraj Khamiyada 8 years ago

CBSE > Class 12 > Chemistry

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Rihaan Vashistha 8 years ago

dsp2 hybridisation diamagnetic

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Phenol

Posted by Yogesh Deswal 8 years ago

CBSE > Class 12 > Chemistry

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Rihaan Vashistha 8 years ago

One or more hydroxyl group directly attach with benzene thats called phenol...

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Shri Gopal Soni 8 years ago

C6H5OH

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What is nerst eq

Posted by Mayank Singh 8 years ago

CBSE > Class 12 > Chemistry

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Rohan Sony 8 years ago

E=E°-2.303\n log [A°]\[A]

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Ujjwal Kumar 8 years ago

Spiderman

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Why MeNH2 is stronger base than MeOH?

Posted by Megha Swain 8 years ago

CBSE > Class 12 > Chemistry

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Conversion of ethanol to but-1 -yne

Posted by Ayush Yadav 8 years ago

CBSE > Class 12 > Chemistry

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Ravi Anshuman 8 years ago

Na-C=C-H

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Chloropropane to propanol

Posted by Yuvraj Singh 8 years ago

CBSE > Class 12 > Chemistry

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Ashish Verma 8 years ago

Add. ( Aquues) NaOH

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Differentiation between amorphos and crystalline solids

Posted by Akash Rathod 8 years ago

CBSE > Class 12 > Chemistry

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Suresh Krishna 8 years ago

Crystalline solids: Definite geometrical shape. Melt at sharp temperature. Generate smooth surfaces on cutting. Anisotropic. True solids. Long range order. Amorphous solids: Irregular shape. Soften over range of temperature. Generate irregular surfaces on cutting. Isotropic. Pseudo solids or super cooled liquids. Short range order.

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What are fat soluble and water soluble vitamins give two ex

Posted by Deepak Kumar 8 years, 1 month ago

CBSE > Class 12 > Chemistry

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Tanuja Biswas 8 years ago

Fat soluble vitamins: the vitamins which are soluble in fats ...thus get stored in the body with the fat...(i.e. in the adipose tissue) eg is vitamin A, D, E, and K Water soluble vitamins: the vitamins which are not fat soluble but water soluble that is, they get dissolved in water and get removed from the body with the excess amount of water through the urine. Eg are Vitamin B complex( except B 12 ) and vitamin C There is one more difference between them i.e. since fat soluble vitamins are retained in the body, if we take them in excess then there will be bad consequences on health but if we take water soluble ones in excess it will not affect us since they are continuously removed from the body. This is also the reason why we need to regularly take vitamin B and C.

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calculate the molecularity for NH4OH from the following data. molecularity [Ba(OH)2]=457.6 Scm2/Mol molecularity [BaCl2]=240.6 Scm2/Mol molecularity [NH4Cl]=129.8 Scm2/Mol

Posted by Rashmi Sah 8 years, 1 month ago

CBSE > Class 12 > Chemistry