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

Molality is defined as the “total moles of a solute contained in a kilogram of a solvent.” The term needs to calculate the mass of the solvent and moles of solute.
Molarity is one of the most widely used unit of concentration and is denoted by M. It is defined as no. of moles of solute present in 1 liter of solution.

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What is ionic solution?

Posted by Vikash Vishwal 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 11 months ago

Ionic compounds are solids and hard due to the strong attracting force between the positive and negative ions. These compounds are generally brittle and break into pieces on application of pressure. Ionic compounds have high melting and boiling points because a application of significant amount of energy can break the strong inter-ionic attraction.

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Phenol is more acidity than alcohols

Posted by Sunny Sahani 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Anjana Sherawat 6 years, 11 months ago

Because of +R effect of benzene ring

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Is rate of reaction always constant

Posted by Ranjeet Randhawa 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 11 months ago

The rate of reaction (average rate) is defined as the change of concentration of any one of its reactants (or products) per unit time.

Rate of reaction is not uniform. It goes on decreasing from moment to moment due to decrease in the concentration(s) of reactant(s) with the progress of reaction i.e. with time as shown below by rate vs time curve. Thus, the rate defined above is actually the average rate of reaction during the time interval considered.

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What is colloiden?

Posted by Priyank Kumar 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Bhavya Sharma 6 years, 11 months ago

Is it colloiden or colloidel

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How can we prepare kmno4 from pyrolusite ore

Posted by Aditya Arora 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Jayant Tehlan 6 years, 11 months ago

Pottassium Permanganate (KMnO4) is prepared fromPyrolusite ore (MnO2). The finely powdered Pyrolusite ore(MnO2) is fused with an alkali metal hydroxide like KOH in the presence of air or an oxidizing agent like KNO3 to give the dark green potassium Manganate (K2MnO4). Potassium manganate disproportionate in a neutral or acidic solution to give potassium permanganate. 2 MnO2 + 4 KOH + O2 ----------> 2K2MnO4 + 2H2O 3 MnO42- + 4H+ ------------> 2MnO4- + MnO2 + 2H2O Commercially potassium permanganate is prepared by the alkaline oxidative fusion of Pyrolusite ore (MnO2) followed bythe electrolytic oxidation of manganate (4) ion. 2 MnO2 + 4KOH + O2 -----------> 2K2MnO4 + 2H2O MnO42- ------(electrolytic oxidation)----> MnO4- + e-

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And what should i learn to do small conversions at least???

Posted by Rutuja Karambelkar 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Jayant Tehlan 6 years, 11 months ago

Prepare all name rxn

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Project tips on good side of adelteration in food

Posted by Purva Bhate 6 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Conversions are very confusing please upload all the conversions separately

Posted by Rutuja Karambelkar 6 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

H!Mαη$Hμ Ұαδαυ ✔️ 6 years, 11 months ago

It is very easy but you need strong concept and just some practise

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Jayant Tehlan 6 years, 11 months ago

Touch conversion at last when you complete both the books

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Difference between sn1 and sn2

Posted by Sonu Dagar 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Abhyuday Chauhan 6 years, 11 months ago

Spelling ka??

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Sn1 and sn2 reaction

Posted by Aashee Jaiswal 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Rutuja Karambelkar 6 years, 11 months ago

See firstly in sn1 mechanism a carbocation is formed whereas in sn2 nucleophile is directly added to the opposite side of the leaving group Secondly sn1 takes place in 2 steps while sn2 is a one step process Third sn1 is mostly followed and polar solvents(because they can stabilise carbocation by solvation) but sn2 is followed by non-polar solvents

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Why BH3 is more acidic than NH3 reason

Posted by Rewati Gupta 6 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Jayant Tehlan 6 years, 11 months ago

As downward the grp size of grp15 element increases so bond length increases H+ can easily dissociate from the bond.

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Aman Kumar 6 years, 11 months ago

Kyu batao

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Can Anyone know the weightage of Each chapter. PLEASE Answer chapterwise

Posted by Arjun Pal 6 years, 11 months ago

CBSE > Class 12 > Chemistry

3 answers

Arjun Pal 6 years, 11 months ago

Thanks, this means that i had to practice only 5 chapters to pass?

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Mansi Gupta 6 years, 11 months ago

Sorry chapter14=4 marks and chapter 16=3 marks

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Mansi Gupta 6 years, 11 months ago

Chapter 1 =4marks Chapter2= 5marks Chapter3=5marks Chapter4=5marks Chapter5=4marks Chapter6=3marks Chapter7=8marks Chapter8=5marks Chapter9=3marks Chapter10=4marks Chapter11=4marks Chapter12=6marks Chapter13=4marks Chapter14=4marks Chapter15=3marks Chapter14=3marks

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What is miscells

Posted by Ankit Kumar 6 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Arjun Pal 6 years, 11 months ago

Miscelles is conc. Of soap

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Jayant Tehlan 6 years, 11 months ago

The colloidal form by association of molecules which behaves as electrolytes at low concentration but at sufficient concentration association of molecules take place. Such type of colloids are called micelle

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Plzzz tell me the important name rxns. From ch alcohol phenol nd ethers

Posted by Navya Singh 6 years, 11 months ago

CBSE > Class 12 > Chemistry

4 answers

Jayant Tehlan 6 years, 11 months ago

Wlcm

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Navya Singh 6 years, 11 months ago

Thnx yrr

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Jayant Tehlan 6 years, 11 months ago

Dow's process, Kolbe's rxn, Reimer Tiemann rxn, coupling rxn, Williamson synthesis,

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Arjun Pal 6 years, 11 months ago

I don't Know.

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convert ethanol to acetone

Posted by Teresa Ma 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 11 months ago

Following is chemical reaction convert Ethanol to Acetone:

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Which is used for food preservatives Option 1 aspartame 2 aspirin 3 sodium benzoate 4 paracetamol

Posted by Saurabh Bhandary 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Tushar Gehlwat 6 years, 11 months ago

1 is sweetning agent,,3 is used as food preservative of class 2.

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Arrange C6H5OH, C2H5OH&H2O in increasing order of acidic strength

Posted by H I T E S H 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Tushar Gehlwat 6 years, 11 months ago

1) C6H5OH 2)H2O 3)C2H5OH bcz in 1) there is electron with drawing group so it weaker the bond of OH bond and H easily released.. 2) H2O have no group..3)C2H5OH have electron donating group so it increase OH bond strength and release of H decrease...

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What is the effect of increasing pH on K2 cr2 O7 solution

Posted by Aditya Singh 6 years, 11 months ago

CBSE > Class 12 > Chemistry