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

a solid substance that has a conductivity between conductor and insulator. Semiconductor have electron in its conduction band .therefore its conductivity increases on increasing temperature.

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Khushi Singh 6 years, 2 months ago

Whose conductivity lies b/w conductor and insulator like silicon or germanium

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When solute and solvent both are in 50percent, how can I determined solute and solvent?

Posted by Prashant Hoon 6 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Ron Vineetahuja 6 years, 2 months ago

It means both are in dispersed phase

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Nisha Bains 6 years, 2 months ago

composition of solution which physical or chemical properties is more shows that is solvent another is solute

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Give the VBT description of [Cr(Cn)4]2-

Posted by Kaushik Kumar 6 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Harshvardhan Gupta 6 years, 2 months ago

[Cr(CN)4]2- Cr2+=[Ar]3d^4;4s^0(exception configuration of cr with removal of 2 electron). As cn is strong ligand which pair up the electron as a result there become 3 vacant d orbital So check the question again here cn cannot be the ligand.

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the dipole moment of chlorobenzene is lower than that of cyclohexly choride

Posted by Riya Bhartu 6 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Pragati Gola 6 years, 2 months ago

In chlorobenzene parital double bond(shot bond length) character exist between cl and benzene while pure single bond in cyclohexyl chloride. Since,dipole moment is product of charge and distance. Therefore, chlorobenzene has low dipole moment than cyclohexyl chloride .

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What is the mot of N2

Posted by Jatin Gupta 6 years, 2 months ago

CBSE > Class 12 > Chemistry

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Suggest some points to include in my project on dna extraction for chemistry board project.

Posted by Sanjay Kumar 6 years, 2 months ago

CBSE > Class 12 > Chemistry

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How can i make my board project on dna extraction or fingerpriting more effective ?

Posted by Sanjay Kumar 6 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

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what is silica gel

Posted by Amrita Yadav 6 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Ariba _____ 6 years, 2 months ago

Silica gel packets are used to absorb moisture and keep things dry. OR- Silica gel is an amorphos and porous form of silicon dioxide, consisting of an irregular tridimensional frame work of alternating silicon and oxygen atoms with nanometer-scape voids and pores. The voids may contain water or some other liquids,or may be filled by gas or vaccume. CHEMICAL FORMULA- SiO2 Molar mass- 60.08 g/ mol Density- 700kg/m3

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Ink experiment

Posted by Neha Chaudhary 6 years, 2 months ago

CBSE > Class 12 > Chemistry

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An octahedral complex is prepared by mixing CoCI3 and NH3 in 1:4 molar ratio. 0.1 molal solutions of this complex was found to freeze at -0.372 C . What is the formula of the complx

Posted by Anita Rai 6 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Ashutosh Tiwari 6 years, 2 months ago

[Co(NH3)4Cl2]Cl

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Anita Rai 6 years, 2 months ago

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Boiling point of water at 750mm hg is 372k .how much sucrose is to be added to 500gm of water such that it boils at 373k

Posted by Shivi Rawat 6 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Forth floatation process

Posted by Ashish Mishra 6 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 2 months ago

Froth Flotation Process
Ore contains rocky impurities which are needed to be separated before processing. This process is called concentration of ore. The principle of froth flotation process is that sulphide ores are preferentially wetted by the pine oil, whereas the gangue particles are wetted by the water. In this process, a suspension of a powdered ore is made with water. In this process, a suspension of a powdered ore is made with water.
Collectors like pine oil, fatty acids and xanthates are added to it. Froth stabilizers like cresols, aniline stabilize the froth. The minerals particles become wet by oils while gangue particles by water. The mixture is agitated with the help of mechanical stirrer by passing blast of air. The froth is formed which is lighter and skimmed off. The froth is dried for recovery of the ore particles.

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Define osmotic pressure and law of osmosis. How molecular mass of solute can be determined from osmotic pressure?

Posted by Rameshkumar Bhoi 6 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

How to find log and antilog using logbook

Posted by Deshna Parikh 6 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

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Last year KVPY paper question bata do plz

Posted by Tannu Madaan 6 years, 2 months ago

CBSE > Class 12 > Chemistry

4 answers

Tannu Madaan 6 years, 2 months ago

Delhi

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Aadi Ahluwalia 6 years, 2 months ago

WhatsApp pr click kr ke bhej deta hu

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Tannu Madaan 6 years, 2 months ago

Chahiye

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Aadi Ahluwalia 6 years, 2 months ago

Mere pass book padi hai agar chahiye to batao

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Why in instantaneous rate of a rxn. for reactant slope is negative and in product it is positive

Posted by Khushi Singh 6 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Dharmbir Rathee 6 years, 2 months ago

It is because Reactant is decreasing contiuously and Product is positive as it is formed with time

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ANSWER

How to study organic chemistry i can't focus on it plzzzz if someone has any suggestions share it with me

Posted by Yashaswi Yadav 6 years, 2 months ago

CBSE > Class 12 > Chemistry

5 answers

Prashant Hoon 6 years, 2 months ago

Sirf practice karne sa hi aati hai yadi tum physical or inorganic phadoga too concentrate nahi kar payoga

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Prashant Hoon 6 years, 2 months ago

Organic chemistry phadta time sirf organic hi phado physical or inorganic nahi kyoki isma reactions ka khel hai joki yad too hoti nahi

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Naidu Ganesh 6 years, 2 months ago

Please concentrate on reactions a make sure that you are thorough with concepts....

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Tannu Madaan 6 years, 2 months ago

Gud lage to batana

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Tannu Madaan 6 years, 2 months ago

You just have to read and understand carefully, make learning as the story bcz it is just a rxns and make them easy good luck

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Iupac name of compound (Ch3)3CCH=CHClC6H6I-p

Posted by Sakshi Garg 6 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

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Chemisry project topic

Posted by Kumari Vidhi 6 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Nitin Sharma 6 years, 2 months ago

Polymers,adultration of food,extraction of ore,etc

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How will akylisothyonate produce?

Posted by Ranjit Kushwah 6 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

How many steoroisomet are possible for butane2_3 diol

Posted by Ranjit Kushwah 6 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Deeya Singh 6 years, 2 months ago

It has 3 stereoisomers.

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In alchol and phenol which is more reactive and why?

Posted by Nirupa Mane 6 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Deeya Singh 6 years, 2 months ago

Phenol is more reactive because it can easily form phenoxide ion (by donating H+ ion) which is resonatingly stabilised. Whereas when alcohols liberate H+ ion an alkoxide ion is formed which is less stable than the phenoxide ion due to +I effect of alkyl group attached to O in alcohol.

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Carbanion is stabilized by -I effect of halogen groups & backbonding. On the basis of above statement justify that CHF3 is less acidic than CHCl3.

Posted by Aiman Kulsoom 6 years, 2 months ago

CBSE > Class 12 > Chemistry