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

Mutarotation is the change in the optical rotation because of the change in the equilibrium between two anomers, when the corresponding stereocenters interconvert. Cyclic sugars show mutarotation as α and β anomeric forms interconvert.

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Why are simple hydrocarbons more soluble in water as compared to complex hydrocarbons like benzene ???

Posted by Sarmin Sultana 5 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Harish Chand 5 years, 10 months ago

Due to resonance

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Anubhav Tiwari 5 years, 10 months ago

Because as no. Of carbon atom increases the hydrophobic part increases hence solubility of complex hydrocarbon decreases

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Benzene and toluene from nearly ideal solution. At 293K, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr . The partial vapour pressure benzene at 293K , a solution containing 78gm of benzene and 46gm of toluene in torr is...................

Posted by Tapan Pandey?? 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Tamanna Sharma 5 years, 10 months ago

I think there is something wrong in your question because it's not clear here you asked about partial vapour pressure, but it is given already here,l think 75 and 22 are pure form vapour pressure here and acc to this the total vapour pressure of mixture is 57.3

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what is deiceing agent

Posted by Aush Tiwari 5 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Yogita Ingle 5 years, 10 months ago

A de–icing agent is a substance that prevents the formation of ice. Example 1: NaCl is a de–icing agent as it lowers the freezing point of water so that it doesnot freeze to form ice under a particular temperature range. Therefore, it is used to clear snow from roads.

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Tamanna Sharma 5 years, 10 months ago

Prevents the formation of ice (lower the freezing point of water) eg. NaCl

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Which allotrophs of sulphur is more stable and why

Posted by Tamanna Sharma 5 years, 10 months ago

CBSE > Class 12 > Chemistry

7 answers

Tapan Pandey?? 5 years, 10 months ago

All the monoclinic allotrope change it self in rhombic allotrope to get stability

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Tamanna Sharma 5 years, 10 months ago

What is the reason that octahedral is more stable than monoclinic

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Tapan Pandey ?? 5 years, 10 months ago

It is found in octahedral shape, and due to geometrical orientation it is more stable than monoclinic form

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Tamanna Sharma 5 years, 10 months ago

But why? How we can say due to octahedral shape it is more stable

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Anubhav Tiwari 5 years, 10 months ago

Rhombic shulphur is more stable

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Yogita Ingle 5 years, 10 months ago

Sulphur mainly exists in two forms of allotropes: Rhombic and Monoclinic forms.
Out of these, rhombic allotrope (yellow in color) of sulphur is the most stable allotrope of sulphur.
The rhombic form gets converted to monoclinic when the rhombic form is heated at a temperature greater than $370 K$ 370 K.

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Tapan Pandey?? 5 years, 10 months ago

Rhombic allotrope, because of its octahedral shape

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Why the bond length of all compounds is same in CCl4= CH4 =CF4 ?

Posted by Tamanna Sharma 5 years, 10 months ago

CBSE > Class 12 > Chemistry

0 answers

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Define Ore benefaction

Posted by Manjot Singh 5 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Yogita Ingle 5 years, 10 months ago

Benefaction: - Removal of the unwanted materials (e.g., sand, clays, etc.) from the ore is known as concentration, dressing or benefaction. It involves several steps and selection of these steps depends upon the differences in physical properties of the compound of the metal present and that of the gangue.

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Tamanna Sharma 5 years, 10 months ago

Another name of conc. of ore/dressing ~remove impurities from ore

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Are drug structure could be asked in paper

Posted by Did Movies 5 years, 10 months ago

CBSE > Class 12 > Chemistry

9 answers

Rameez Khan 5 years, 10 months ago

May be

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Ayat Khan 5 years, 10 months ago

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Tapan Pandey?? 5 years, 10 months ago

It can be asked

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Tamanna Sharma 5 years, 10 months ago

But in some sample paper 2020 there is question present about structure of drugs like structure of penicillin

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Meghna Sharma 5 years, 10 months ago

N if u check previous exams there isnt ant ques related to the structure of the drug

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Meghna Sharma 5 years, 10 months ago

Not at all. Becoz besides it there is polymers, biomolecules, these a r having enough strictures to ask

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Tamanna Sharma 5 years, 10 months ago

As in one marks question

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Tamanna Sharma 5 years, 10 months ago

Yes

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Neha Choudhary 5 years, 10 months ago

May be not

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CH3CH(OH)CH3 in the presence of pbr3

Posted by Sahib Sa 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Tushar Khokher 5 years, 10 months ago

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Bonding in +4 &+6 oxidation state is primarily covalent in group 16 ?

Posted by Harshita Soni 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Tushar Khokher 5 years, 10 months ago

Yes

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Define tertiary structure of protein

Posted by Aman Rathour 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 5 years, 10 months ago

This is the structure that gives protein the 3-D shape and formation. After the amino acids form bonds (secondary structure) and shapes like helices and sheets, the structure can coil or fold at random. This is what we call the tertiary structure of proteins. If this structure is disrupted or disturbed a protein is said to be denatured which means it is chemically affected and its structure is distorted.

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Density of a 2.05M solution of acetic acid in water is 1.20g/ml . The molarity of the solution is...................

Posted by Tapan Pandey ?? 5 years, 10 months ago

CBSE > Class 12 > Chemistry

3 answers

Tamanna Sharma 5 years, 10 months ago

Using density find wt.of solution and by using molarity find wt. Of solute.then solvent=solution-solute, now it's easy to find molality.

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Tapan Pandey ?? 5 years, 10 months ago

But how u have solved it

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Tamanna Sharma 5 years, 10 months ago

As molarity is already given (2.05)in question, so here it can ask about find MOLALITY. = 2.29

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Which one has higher boiling point haloalkene or haloarene??

Posted by Arsh Me 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Tenzin Sherab 5 years, 10 months ago

Haloarene

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How molar mSs of a dolute is determined from osmotic pressure movement

Posted by K Nandini 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Riya Rana 5 years, 10 months ago

π=CRT....Where C = n/volume and n = W/M {where M is the molar mass} hence, π=W/MV × RT.

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one-fourth of 1st order reaction is completed in 32 minutes calculate half time

Posted by Janvi Vashishtha 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Tamanna Sharma 5 years, 10 months ago

48 min.

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CH3OH +KCN--->CH3CN BUT WHY CH3OH + AgCN---->CH3NC ??

Posted by Ayan Singh 5 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Nikita Beniwal 5 years, 10 months ago

KCN ionise due to ionic bond thus both c nd N is available for bond formation , c-c bond is more stable so form -CN but AgCN is covalent and only N is available for bonding

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What is the question pattern 2019-2020.and the marks distribution??

Posted by Ariyan Rahaman 5 years, 10 months ago

CBSE > Class 12 > Chemistry

3 answers

Tapan Pandey?? 5 years, 10 months ago

Go through cbse syllabus of this app

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Shahana Saifi 5 years, 10 months ago

There are 20 -1 mrk que 7 -2 mark que 7-3 mark que and 3-5 mark ques in 5 mark there is a choice in each ques

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Hardik Singh 5 years, 10 months ago

There will be around 37 questions in each subject PCM

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How is henry law related to solubility of gas in liquid

Posted by Jasman Dhillon 5 years, 10 months ago

CBSE > Class 12 > Chemistry

3 answers

Tapan Pandey?? 5 years, 10 months ago

Solubility is directly proportional to partial pressure

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Yogita Ingle 5 years, 10 months ago

Henry’s law is a gas law which states that at the amount of gas that is dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid when the temperature is kept constant. The constant of proportionality for this relationship is called Henry’s law constant (usually denoted by ‘k_H‘). The mathematical formula of Henry’s law is given by:

P ∝ C (or) P = k_H.C

Where,