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

Let the mass of solution be 100 gm Mass of Benzene =30 gm Mass of CCl 4 =70 gm Moles of Benzene = 78 30 =0.385 Moles of CCl 4 = 154 70 =0.45 moles Mole fraction (Benzene) = 0.385+0.45 0.385 =0.461

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What is coordination number of atoms: a) in a cubic close packed structure b) in a body centred cubic structure

Posted by Randhawa Kaur 4 years, 1 month ago

CBSE > Class 12 > Chemistry

2 answers

Yogita Ingle 4 years, 1 month ago

(i) The coordination number of an atom, ion or molecule is the number of constituent particles which touch that particular atom, atom or molecule.
(ii)
(a) in a cubic close packed structure coordination number is 12
(b) ) in a body–centered cubic structure coordination number is 8.

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Sandeep Bhardwaj 4 years, 1 month ago

The coordination number of atoms in: (a)6 (b)8

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What happens when active sec.pentyl reacts with KOH dissolved in ethanol?

Posted by Jass . 4 years, 1 month ago

CBSE > Class 12 > Chemistry

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What do mean by inert pair effect.

Posted by Sneha Choudhary 4 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 4 years, 1 month ago

The inert pair theory was proposed by Sidgwick. He along with Powell accounted for the shapes of several molecules and correlated the shapes with some of their physical properties.

nert pair effect is defined as The non-participation of the two s electrons in bonding due to the high energy needed for unpairing them.

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Can someone please suggest me a book with the name of the author for bibliography. I'm doing the analysis of cold drink investigatory project

Posted by Karla B 4 years, 1 month ago

CBSE > Class 12 > Chemistry

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To prepare M/20 solution of mohrs salt using this solution determines molarity and strength of KMno4 solution ? FeSo4.(NH4)2.620 . H2O.

Posted by Gunjan Verma 4 years, 1 month ago

CBSE > Class 12 > Chemistry

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if an electron absorbs red? colour in a compound then what is the compound colour????

Posted by Sree Ramana 4 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Sree Ramana 4 years, 1 month ago

why the colour of the compound will be green.. explanation..

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Nikhil Mishra 4 years, 2 months ago

Colour of compound will be green

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What are the necessary conditions for a group or substituent to be "electron withdrawing"?

Posted by Sree Ramana 4 years, 2 months ago

CBSE > Class 12 > Chemistry

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Plz give me all methods for preparation of haloalkanes Alcohol Carboxylic acid

Posted by Tanu??????? Bhardwaj??????? 4 years, 2 months ago

CBSE > Class 12 > Chemistry

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what is the structure of 3-Hydroxybutanal

Posted by Ashish Bon Hazarika 4 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 4 years, 2 months ago

The structure of the compound 3-Hydroxy butanal is shown here-

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How can i pass in Physics, Chemistry, Maths?

Posted by Shree Ram Faujdar 4 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Sanjana Dua?????❣️ 4 years, 1 month ago

Yes, dud not waste ur in asking foolish questions use this time in ur studies with full concentration

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Siddhi Singh 4 years, 2 months ago

Be determined toward your study Definitely u will pass

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What is the chemical name of phosphogen??

Posted by Akanksha Kumari 4 years, 2 months ago

CBSE > Class 12 > Chemistry

4 answers

Tanisha Yadav 4 years, 1 month ago

Wlcm Akanksha

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Akanksha Kumari 4 years, 1 month ago

Thanks Tanisha☺️☺️

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Shree Ram Faujdar 4 years, 2 months ago

What is phosphogen??

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Tanisha Yadav 4 years, 2 months ago

Carbonyl dichloride

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Is adsorption exothermic or endothermic in nature? Explain

Posted by Rohit Yadav 4 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Shweta? Dhama? 4 years, 2 months ago

Physical absorption is essentially exothermic. The reaction of gases with the surface layer of solids may, however, lead to the formation of endothermic compounds. Chemisorption, therefore, may have an endothermic character....hope so it helps u....☺

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Tanya ?? 4 years, 2 months ago

During this process the residual forces on the surface of adsorbent decreases which in turn decreases the surface energy. This energy appears in the form of heat, hence adsorption is exothermic in nature...

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Distinguish between dialysis and ultrafiltration

Posted by Keshav Joshi 4 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Yogita Ingle 4 years, 2 months ago

The dialysis is a separation process that depends on the differential transport of solutes of different sizes across a porous barrier separating two liquids when the driving force is a concentration gradient only. It is usually used to separate solutes too large to diffuse through the barrier from those small enough to diffuse freely through it. The ultrafiltration, sometimes called reverse osmosis, is a more complicated process in that the solvent and solutes up to a certain critical size are forced through the barrier by considerably higher pressure on one side of the porous barrier than on the other. Thus, there is always a flow of solvent moving through the barrier in the same direction as the smaller solutes that are able to pass through the membrane. This sets it apart from dialysis where, owing to osmosis, there is usually a certain net movement of solvent in the direction opposite to the movement of solute.

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Gaurav Seth 4 years, 2 months ago

Dialysis is a clinical application that helps patients to clean their blood artificially while the ultrafiltration is a process that occurs naturally during the urine formation in our kidneys. Furthermore, in dialysis, solutes move from high concentration to low concentration along the electrochemical gradient. But in ultrafiltration, the substances travel due to a pressure gradient. Hence, this is another difference between dialysis and ultrafiltration. Moreover, dialysis occurs in a dialyzer or the membrane lining of our abdomen while ultrafiltration takes place between the glomerulus and the Bowman’s capsule of the nephron.

Furthermore, the rate of ultrafiltration depends on the porosity of the membrane and the speed of blood flow (or the pressure created by the blood flow) while the dialysis rate depends on the dialysate flow rate. Thus, this is also a difference between dialysis and ultrafiltration.

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Discuss the nature of bonding in metal carbonyls

Posted by Neha Sharma 4 years, 2 months ago

CBSE > Class 12 > Chemistry

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Sandmerys reaction

Posted by Keshav Joshi 4 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Gaurav Seth 4 years, 2 months ago

The Cl-,Br- and CN- nucleophiles can easily be introduced in the benzene in the presence of Cu(I) ion. This reaction is called sand Meyer's reaction.

It is used to synthesize aryl halides from aryl diazonium salts. It is an example of a radical-nucleophilic aromatic substitution.

When a primary aromatic amine, dissolved or suspended in cold aqueous mineral acid, is treated with sodium nitrite, a diazonium salt is formed. Mixing the solution of freshly prepared diazonium salt with cuprous chloride or cuprous bromide results in the replacement of the diazonium group by −Cl or −Br.

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Chemistry cbse ko kese learn kere

Posted by Nisha Nisha 4 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Akanksha Kumari 4 years, 2 months ago

It is very easy to learn chemistry if u r interested Dude just read ncert book it helps u a lot And watch videoes if u have any doubt

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Sanitizer is metal or non metal

Posted by Anushka Chahar 4 years, 2 months ago

CBSE > Class 12 > Chemistry

4 answers

Himanshu Jaglan 4 years, 2 months ago

Sanitizer is non metal

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Sree Ramana 4 years, 2 months ago

How it can be said that sanitizer is non-metal?

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Shree Ram Faujdar 4 years, 2 months ago

How non metal???

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Anushka Chahar 4 years, 2 months ago

Non metal

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Write the name of the compound [Ti (H20)6]3+

Posted by Sangita Das 4 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Anurag Singh 4 years, 1 month ago

Hexaaquatitanium(lll) ions

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Tanisha Yadav 4 years, 2 months ago

The IUPAC name of [Ti(H 2 O) 6 ] 3+ is hexaaquotitanium(III). solution

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When chlorine reacts with cold and dilute solution of sodium hydroxide, what it form??

Posted by Akanksha Kumari 4 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Akanksha Kumari 4 years, 2 months ago

Thanks yogita☺️☺️

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Yogita Ingle 4 years, 2 months ago

When chlorine reacts with cold and dilute sodium hydroxide, the following reaction takes place:

2NaOH + Cl₂ ⟶ NaCl + NaClO + H₂O.

Hence the products are Cl⁻ and ClO⁻

When chlorine reacts with hot and concentrated sodium hydoxide, the following reaction takes place:

NaOH + Cl₂⟶ 5NaCl + NaClO₃+ 3H₂O

Hence the products are Cl⁻ and ClO₃⁻

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Explain the bonding in coordination compounds in terms of Werner's postulate?

Posted by Sangita Das 4 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Akanksha Kumari 4 years, 2 months ago

Postulates of Werner's coordination theory: (1) Metal shows primary valence (ionizable, oxidation number) and secondary valence (non ionizable, coordination number). (2) Coordination number (secondary valence) is fixed for every metal. (3) Negative ions satisfy primary valence and negative ions or neutral molecules satisfy secondary valence. (4) Secondary valencies are directional in nature and determine stereochemistry of complex.

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Write formula for the following compound 1. Annine chlorobos (elhylenediamine) cobalt (III) ion

Posted by Triloksingh Solanki 4 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Nikki ... 4 years, 2 months ago

I think this compound is wrong

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CH3-CH(Cl)-CH3 reacts with Na/dry ether......... write the product formed???

Posted by Nihira Nihira 4 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Sanjana Dua?????❣️ 4 years, 2 months ago

The product is hexane(CH3-CH2-CH2-CH2-CH2-CH3) This reaction is example of wurtz reaction n(CH3-CH2-CH3)reacts with Na/dry ether forms n(CH3-CH2-CH2-CH2-CH2-CH3) I hope it's help u?✌️

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[fe(cn) 6] ka iupsc name

Posted by Jyoti Sahu 4 years, 2 months ago

CBSE > Class 12 > Chemistry

3 answers

Divya Chouhan 4 years, 2 months ago

Hexa cynoferrate

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Rhea Sharma 4 years, 2 months ago

Hexaphitochlorine sulphur 2O3

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Krati Varshney 4 years, 2 months ago

Hexacyanoferrate

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Phenol to picric acid

Posted by Nitesh Kerketta 4 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Ayush Arya 4 years, 2 months ago

To convert phenol to picric acid we have to react phenol with bromine water so that it's for 2-4-6tribromophenol which is called picric acid which is very reactive in nature

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