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

Collectors like pine oil and fatty acids prevents the metal sulphide particles from getting wet by water i.e. they enhance the non wettability of ore particles

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(Cr.o7)2-

Posted by Firoz Rock 7 years, 4 months ago

CBSE > Class 12 > Chemistry

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What is IUPAC ne

Posted by Upadesh Mishra 7 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Firoz Rock 7 years, 4 months ago

(Cr.o7)2-

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Role of CO in extraction of iron

Posted by Kishan Kishan 7 years, 4 months ago

CBSE > Class 12 > Chemistry

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Why D block element is called Transition Element

Posted by Shubham Thakur 7 years, 4 months ago

CBSE > Class 12 > Chemistry

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Sweety Sweety 7 years, 4 months ago

Because it connect the p block to s block

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What type of solution are formed on dissolving different concentration of soap in water

Posted by Probhakar Roy 7 years, 4 months ago

CBSE > Class 12 > Chemistry

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Why Mercury exists as liquid in periodic table ?

Posted by Abhat Singh 7 years, 4 months ago

CBSE > Class 12 > Chemistry

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Piyush Bhatt 7 years, 4 months ago

Because it is liquid at room temperature

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What weight of Sodium Hydroxide should be dissolved to prepare 250 ml of 0. 2 M solution?

Posted by Bhaskar Anand 7 years, 4 months ago

CBSE > Class 12 > Chemistry

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Chandra Shekhar 7 years, 4 months ago

2 gm

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What is the effect of temperature on adsorption?

Posted by Shrini Shrivastava 7 years, 4 months ago

CBSE > Class 12 > Chemistry

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Ritu Singh 7 years, 4 months ago

For physical adsorption , adsorption is inversely proportional to temperature. And for chemiosorption, adsorption is directly proportional to temperature

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Conversion of aniline to phenol

Posted by Arpita Sharma 7 years, 4 months ago

CBSE > Class 12 > Chemistry

3 answers

Manan Bedi 7 years, 4 months ago

To convert,add NaNO2+HCl to aniline to convert into diazonium salt and then add H2O to it to convert into phenol

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Manan Bedi 7 years, 4 months ago

C6H5NH2

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Pratibha Ydv 7 years, 4 months ago

What is formula of aniline

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Although phenoxide ion has more no. Of resonating str. than carboxylate ion, carboxylic acid is a stronger acid than phenol.why?

Posted by Pratibha Ydv 7 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Ritu Singh 7 years, 4 months ago

The electrons of oxygen in carboxylate ion rotates in the open chain only i.e o=c-o- but in phenoxide ion ,the electrons rotates around the benzene ring which reduces it electron deficiency.so carboxylic acid is more acidic than phenol

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What is the value of k for 0.096=k[0.3]²×[0.3]¹

Posted by Kritika Sharma 7 years, 4 months ago

CBSE > Class 12 > Chemistry

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Ritu Singh 7 years, 4 months ago

The value of k is 4

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How can we find the electrode potential of Mg+2/Mg

Posted by Vaibhav Singh 7 years, 4 months ago

CBSE > Class 12 > Chemistry

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Why are the osmotic pressure of 1M kcl is greater than the 1M of urea

Posted by Vaibhav Singh 7 years, 4 months ago

CBSE > Class 12 > Chemistry

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Manan Bedi 7 years, 4 months ago

Bcz KCl is completely ionized in water so its i=2

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Boiling point of water at 750 mm of Hg is 99.63 degree Celsius. How much sucrose is to be added to 500 g of water such that it boils at 100 degree Celsius ?

Posted by Chanchal Tyagi 7 years, 4 months ago

CBSE > Class 12 > Chemistry

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What is ideal and non ideal solution

Posted by Kunnal Jaglan 7 years, 4 months ago

CBSE > Class 12 > Chemistry

2 answers

Vaibhav Singh 7 years, 4 months ago

Those solution which follows the Raoults law known as ideal solution

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Suhani C 7 years, 4 months ago

Ideal solutions are the solutions which obey raoult's law over the entire range of concentration and temperature. Non ideal solutions does not obey raoult's law

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The E° value for Mn^+3/Mn^+2 is more positive than cr^+3/cr^+2 or Fe^+3/Fe^+2

Posted by Tabarak Zafar 7 years, 4 months ago

CBSE > Class 12 > Chemistry