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

The place on an enzyme where a molecule that is not a substrate may bind, thus changing the shape of the enzyme and influencing its ability to be active.

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What is competitive inhibitors?

Posted by Sheetal Wankhede 7 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Alok Sharma 7 years, 10 months ago

The competition between drug and substrate to bind with an enzyme , as a result drug by competition win and bind with an enzyme and inhibited it's natural function.

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What is the role of graphite rod in the electrometallurgy of aluminium

Posted by Navi Sharma 7 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Radhika Tyagi 7 years, 10 months ago

Graphite is used as anode and Graphite lined converter is used as cathode

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Kanak Tiwari 7 years, 10 months ago

Since graphite is a good conductor it act as anode in electro metallurgy of aluminium

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Define the ione

Posted by Anil Kodise 7 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Aniket Yadav 5 years, 11 months ago

A charged atom form by loosing or gaining of electron

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Hany Sharma 7 years, 10 months ago

A species which is either positively or negatively charged .also the ions may be mobile or immobile

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How will we know that a metal ion of complex compound are sp3d2 or d2sp3 hybridized?

Posted by Priya Kumari 7 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Hany Sharma 7 years, 10 months ago

With the help of valence band theory introduced by pauli.we can easily determine it

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Is log book provided during boards exam

Posted by Ritik Dharewal 7 years, 10 months ago

CBSE > Class 12 > Chemistry

4 answers

Priya Prakash S 7 years, 10 months ago

Values of log will be given in question paper itself.

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Akash Gujjar 7 years, 10 months ago

Yes it is wright

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Yuthika Yadav 7 years, 10 months ago

Most of the times the value of log of specific no. (Like 2,4,3 etc.) are provided in paper itself

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Ujjawal Sharma 7 years, 10 months ago

Yes

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De broglie eq.?

Posted by K D 7 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Aditi Roy 7 years, 10 months ago

Or , lambda d =h /mv

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Shikha Rai 7 years, 10 months ago

Lemda d =h/p or h/underoot 2mk

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Among organic chemistry which is most important chapter????

Posted by Priya Prakash S 7 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Purnesh Kumrawat 7 years, 10 months ago

Aldehyde,ketone and carboxylic acid

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Why are lyophilic colloids sols are more stable than lyophobic colloids

Posted by Navi Sharma 7 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Radhika Tyagi 7 years, 10 months ago

Bcz lyophilic sols are highly hydrated

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Kanak Tiwari 7 years, 10 months ago

It is due to the more force of attraction between the dispersed phase and dispersed medium and lyophilic in sols than lyophobic sols

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What is denial cell

Posted by Zeff Rizvi 7 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Aayisha Azeez 7 years, 10 months ago

It's Daniel cell

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Deepak Chauhan 7 years, 10 months ago

The cell which converts elececrical energy into chemical energy is called galvanic cell and when this cell have Zn as anode and Cu as cathode then it is called denial cell

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Alkyl halide react with AgNo2 to give R-No2 and R-ONO . Why?

Posted by Shivani Shivani 7 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Radhika Tyagi 7 years, 10 months ago

Bcz NO2 is an ambidentate ligand

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Neha Garg 7 years, 10 months ago

With AgNO2 it will give R-NO2 due to covalent nature of AgNO2 while with KNO2 it will give R-ONO due to ionic nature of KNO2

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What is smelting?

Posted by Shivani Shivani 7 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Deepak Chauhan 7 years, 10 months ago

Any molten form which is form in any step of extraction of metal is called smelting.

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Machenism of ethene to ethanol

Posted by Ankesh Singh 7 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Saurabh Kumar 7 years, 10 months ago

refer to ncert book.

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Deepak Chauhan 7 years, 10 months ago

When ethene reacts with H+/H2O it give ethanol. Mec--- due to polarisation there is a partial positive and partial negative character on both Carbon so H+ attack on negative side and make a positive charge on other carbon. Now as H2O is present in excess so OH- attack on +ve carbon and results in formation of ethanol

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What is schmidt rxn?

Posted by Ashwani Kumar Maurya 7 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Saurabh Kumar 7 years, 10 months ago

when benzaldehyde reacts with benzoyl chloride , it gives benzophenone...

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Tell me some important distinguishing rxns of organic chemistry

Posted by Dhruv Gupta 7 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Radhika Tyagi 7 years, 10 months ago

Carbylamine reaction, haloform reaction

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Saurabh Kumar 7 years, 10 months ago

all named reaction.

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How to study p block chapter????? Tooooo long

Posted by Priya Prakash S 7 years, 10 months ago

CBSE > Class 12 > Chemistry

3 answers

Ashish Kumar 7 years, 10 months ago

Chemistry is easy but physics is tough

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Saurabh Kumar 7 years, 10 months ago

just see cbse syllabus of p-block chapter..... and study just one group in a day....

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Anjali Sharma 7 years, 10 months ago

Study this chapter from arihant book. Trust me so easy

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Arrange in the increasing order of their inter molecular forces ;-terylene, polyethlene, neoprene?

Posted by Cicil George 7 years, 10 months ago

CBSE > Class 12 > Chemistry

4 answers

Cicil George 7 years, 10 months ago

Thank u

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Kanak Tiwari 7 years, 10 months ago

Increasing order of their intermolecular forces neoprene ,polythene, terylene

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Saurabh Kumar 7 years, 10 months ago

basis of intermolecular forces_increasing order- elastomer<thermoplastics<fibres

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Saurabh Kumar 7 years, 10 months ago

neoprene<polyethene<terylene

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Why is co stronger ligand than cl-1

Posted by Nitin Rathore 7 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Radhika Tyagi 7 years, 10 months ago

Gud ans?

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Deepak Chauhan 7 years, 10 months ago

CO forms coordinate bond that has both sigma and pi character. Bue to multiple bond carbonyl metal bond is very strong hence energy splitting is very high but cl- has a inductive effect only

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How to study organic chemistry???????

Posted by Priya Prakash S 7 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Saurabh Kumar 7 years, 10 months ago

firstly study first 3 chapters of organic chemistry..... your 80% syllabus from organic will be done.

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Radhika Tyagi 7 years, 10 months ago

Do name reaction and distinction first

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What does the part 6,6 mean in nylon6,6. ???

Posted by Cicil George 7 years, 10 months ago

CBSE > Class 12 > Chemistry

3 answers

Kalindi Yadav 7 years, 10 months ago

Your Welcome

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Cicil George 7 years, 10 months ago

Thank u

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Kalindi Yadav 7 years, 10 months ago

Nylon 66 is made of two monomers each containing 6 carbon atoms, hexamethylenediamine and adipic acid, which give nylon 66 its name.

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Volatile or non volatile solution

Posted by Harshit Kumar 7 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Kalindi Yadav 7 years, 10 months ago

Differences Volatile substances have a tendency to vaporize whereas nonvolatile substances do not have a tendency to vaporize. Volatile substances have a high vapor pressure at normal room temperature and pressure. Nonvolatile substances do not have a high vapor pressure in these conditions. When volatile liquids are heated or stored in an open container, the volume of it decreases but this doesn’t happen to nonvolatile liquids. Volatile substances are generally highly flammable compared to nonvolatile substances. Volatile substances can be easily detected by the smell compared to the nonvolatile substances.

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Why electrolytic reduction is preferred over chemical reduction!?!

Posted by Ishika Tanwani 7 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Kalindi Yadav 7 years, 10 months ago

More reactive metals i.e, alkali metals and alkaline earth metals are usually extracted by electrolysis of their fused salts because in electrolytic reduction, by aplying external potential from outside soure, reduction can be brought easily. Further, more reactive metals have more affinity with oxygen than that of carbon. That's why electrolytic reduction is preferred over the chemical reduction.

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Write the structures of different dihalogen derivatives of propane

Posted by Neha Verma 7 years, 10 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Bromobezene to benzoic acid . Convert it

Posted by Piyush K 7 years, 10 months ago

CBSE > Class 12 > Chemistry

6 answers

Prerna Pahwa 7 years, 10 months ago

Instead of KCN ,we can use CuCN to change in cynobenzene This rxn name is Rosenmund- von Braun Synthesis

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Kalindi Yadav 7 years, 10 months ago

The phenyl cation does not show resonance. Resonance is the delocalisation of π-electrons or lone pair electrons. It requires the interacting orbitals to be parallel so they can overlap. The π -electron cloud of phenyl carbocation is perpendicular to the vacant p-orbital of the carbocation. Therefore no overlap is possible and thus no resonance is possible. So when in a reaction if an intermediate is not stable then the reaction will not take place. It is very important that any reaction leads to a stabilized intermediates and then products. If stability is not present reaction will not happen.

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Kalindi Yadav 7 years, 10 months ago

No, we cannot react KCN with benzene and then to hydrolyze to form acid because in benzene substitution of -CN cannot takes place as the intermediate formed phenyl.

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Radhika Tyagi 7 years, 10 months ago

Prerna ka ans better h

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Prerna Pahwa 7 years, 10 months ago

. -Add KCN then complete hydrolysis

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Kalindi Yadav 7 years, 10 months ago

Conversion of bromobenzene to benzoic acid involves following steps Step -1:—Formation of toluene from chlorobenzene. Chlorobenzene and methyl chloride are reacted with sodium metal in presence of dry ether to form toluene. Step-2:—Oxidation of toluene to benzoic acid. Toluene is oxidised by alkaline KMnO₄ to form potassium benzoate,which on acid hydrolysis gives benzoic acid.

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Are monosaccharides considered as non reducing carbohydrates ? If yes so why?

Posted by Mansi Singhal 7 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Kalindi Yadav 7 years, 10 months ago

Yes.Because a reducing sugar is a sugar that has a free aldehyde or ketone that can act as a reducing agent.Example- All monosaccharides(glucose, fructose,etc.).

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How to prepare bdc from nitrobenzene?

Posted by Birendra Pattnaik 7 years, 10 months ago

CBSE > Class 12 > Chemistry