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What is the difference between double salt and complex salt????give one example of each??

Posted by Guddu Yadav 5 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Sohan .G 5 years, 11 months ago

Double salt : (1.) They usually contain two simple solids in molecular portion. (2.) There exist only in solid state. In aqueous solutions dissociate completely into ions. (3.) There are ionic compounds and do not contain any co-ordinate bond. (4.) The properties of double salt are same as those of its constituent compounds. (5.) In a double salt the metal ions show their normal valency. (6.) A double salt loses its identity in the solution. Eg.: KCL.MgCl2.6H20, Mohar's salt. Complex salt : (1.) The simple Salt from which they are formed may or may not be equal proportions. (2.) They exist in the solid state as well as in aqueous solution. This is because even in the solution the complex ions does not dissociate into ions. (3.) They may or may not be ionic but the complex part always contain co-ordinate bonds. (4.) The property of coordination compound are different from its constituents. (5.) In a coordination compound the metal ions satisfy its two types of valency is called primary and secondary valencies. (6.) A coordination compound retains its identity in the solution. Eg.: K4[Fe(CN)6], [Cu(NH3)4]SO4.

ANSWER

Perkin reaction

Posted by Shubham Kushwaha 5 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

All name reation not available

Posted by Harshit Malik 5 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Augustya Chaturvedi 5 years, 11 months ago

All name reaction ya ? The be there are Finkelstein, Swarts, Williamson Ether,Fridelcrafts alkylation & acylation,Kolbe, Reimertieman,Rosenmund, Stephen,Wolf Kishner,Hvz,Cannizaro, Etard, Clemenson etc. Refer to ncert bold letters organic 4 chapter's

ANSWER

What is Lucas reagent

Posted by Lakshay Verma 5 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Aman Kumar 5 years, 11 months ago

ZnCl2 + Conc. HCl ( Lucas reagent)

Ajendra Singh 5 years, 11 months ago

an.zncl2 + conc. H2so4

ANSWER

If i can't prepare chemistry both parts , then what i do from now to score 45-50+ marks in board exam..

Posted by Gulshan Yadav 5 years, 11 months ago

CBSE > Class 12 > Chemistry

4 answers

Sohan .G 5 years, 11 months ago

First learn polymers, chemistry in everyday, biomolecules, p,d,f block, surface chemistry.

Manisha Khurana 5 years, 11 months ago

Prepare organic ,surface chemistry ,p&d block.

Ajendra Singh 5 years, 11 months ago

I think organic is easy to learn you will easily score 28-30 marks easily rest of marks you will score with p,d,f block and co-ordination compound

Râhūl ;-),?? 5 years, 11 months ago

Leave oragnic portion and focus on remaining all units

ANSWER

In chemistry , any best topic wise nots available on any sites,, channels. please ! tell me anybody , if know.

Posted by Gulshan Yadav 5 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Which is best book for previous year question paper?

Posted by Gaurav Rawat 5 years, 11 months ago

CBSE > Class 12 > Chemistry

5 answers

Parul Singh 5 years, 11 months ago

Arihant

Sohan .G 5 years, 11 months ago

Examidea or Arihant

Priya Sharma 5 years, 11 months ago

Arihant chapterwise solved papers

Guddu Yadav 5 years, 11 months ago

Oswal previous year solved sample paper is the best book

Ajendra Singh 5 years, 11 months ago

Chapterwise is very best book

ANSWER

How to score 95

Posted by Vikram Roy 5 years, 11 months ago

CBSE > Class 12 > Chemistry

3 answers

Sohan .G 5 years, 11 months ago

Le

Mannat Kaur Khalsa? 5 years, 11 months ago

Duniya..bhul kr pdhai...kro bs..

Ajendra Singh 5 years, 11 months ago

Same as here

ANSWER

Which is the best paper set for boards preparation....to get max marks ?

Posted by Siddharth Patil 5 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Pranjali Pandey 5 years, 11 months ago

All books are good don't be confuse decide and read with one book definetly it will help you?☺

ANSWER

Define Anomers

Posted by Harjinder Pal Singh 5 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Manisha Khurana 5 years, 11 months ago

Carbohydrates which differ configuration of. OH AI c1

ANSWER

Can we score 50+ in chem if we refer (learn) only.... oswald 2020 new eddition paper set ?

Posted by Siddharth Patil 5 years, 11 months ago

CBSE > Class 12 > Chemistry

5 answers

Guddu Yadav 5 years, 11 months ago

I think above 45 we can get

Vikram Roy 5 years, 11 months ago

Ya

Rishabh Gupta 5 years, 11 months ago

I prefer you to chapterwise solved paper 2019 to 2010 chemistry class 12 from Arihant which is best book for scoring good marks in chemistry

Priyanshu Patel 5 years, 11 months ago

NCERT is the best bro

Mannat Kaur Khalsa? 5 years, 11 months ago

Yes

ANSWER

Is solid state chapter there for 12 th cbse boards or not ?

Posted by Harshal Patil 5 years, 11 months ago

CBSE > Class 12 > Chemistry

8 answers

Siddharth Patil 5 years, 11 months ago

No

Rishabh Gupta 5 years, 11 months ago

This chapter is removed from CBSE syllabus so this chapter is not coming in 2020 board exam

Sravan Prajapati 5 years, 11 months ago

No

Mannat Kaur Khalsa? 5 years, 11 months ago

Hardeep jii nhi aa raha...solid state...

Hardeep Kaler 5 years, 11 months ago

Yes

Aleena Elizabeth Vinod 5 years, 11 months ago

No

Mannat Kaur Khalsa? 5 years, 11 months ago

Nooo

Sunita Sharms 5 years, 11 months ago

No

ANSWER

Mam from which source MCQs should be practiced

Posted by Pankaj Sunal 5 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Mannat Kaur Khalsa? 5 years, 11 months ago

Ncert exampler

Gaurav Raj 5 years, 11 months ago

Ncert

ANSWER

Why is glycol and water mixture used in cold countries

Posted by Lakshmi Ram 5 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Sunita Sharms 5 years, 11 months ago

Ethylene glycol act as antifreeze solution. The addition of the ethylene glycol to thevwater

Yogita Ingle 5 years, 11 months ago

A solution of ethylene glycol with the water is an example of antifreeze solution. This is used in the radiator of an internal combustion engine to lower the freezing point of the cooling medium.
The addition of the ethylene glycol to the water depresses the freezing point of the water.

ANSWER

Why is bimolecular dehydration not appropriate for the preparation of ethyl methyl ether

Posted by Bhavesh Gupta 5 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 5 years, 11 months ago

Bimolecular dehydration is a way of preparing diethyl ether from the dehydrating action of concentrated sulfuric acid on ethanol. The dehydrating agent, conc. H₂SO₄ abstracts a hydrogen from one ethanol and a hydroxyl (the -OH group) of the neighbour.By this Sulfuric acid grabs a mole of water.

ANSWER

How will you prepare thoughts Ethane from ethanol

Posted by Lalit Chandel 5 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Alcohol gives litmus test or not

Posted by Vaibhav Maurya 5 years, 11 months ago

CBSE > Class 12 > Chemistry

3 answers

Vaibhav Maurya 5 years, 11 months ago

Alcohol gives litmus test

Rajat Barwar 5 years, 11 months ago

no

Abhay Mishra 5 years, 11 months ago

No

ANSWER

Williamson 's synthesis also known as

Posted by Vaibhav Maurya 5 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

When ether react with air in presence of sunlight then which product obtained?

Posted by Vaibhav Maurya 5 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Which process is used for the industrial preparation of chlorobenzene

Posted by Vaibhav Maurya 5 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Name a substance that can be used as an antiseptic as well as disinfectant

Posted by Vignesh Kumar 5 years, 11 months ago

CBSE > Class 12 > Chemistry

5 answers

Nandini Sharma 5 years, 11 months ago

Phenyl

Shivani Thakur 5 years, 11 months ago

Phenol.....which when 0.1to0.2..is antiseptic and when 1 to2 percent is disinfectant

Sunita Sharms 5 years, 11 months ago

Phenol

Abhay Mishra 5 years, 11 months ago

Phenol ,it's 0.2% acts as antiseptic and 1%of phenol acts as disinfectant

Vaibhav Maurya 5 years, 11 months ago

Phenol

ANSWER

Why is chloroform stored is dark coloured bottles

Posted by Shagun Yadav 5 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Parul Singh 5 years, 11 months ago

Because it reacts with O2 and form toxic gas phosgene

Aman Kumar 5 years, 11 months ago

Chloroform gets oxidised by air in the presence of light to a very poisonous gas, carbonyl chloride, also known as phosgene. Therefore, it is stored in closed dark coloured bottles completely filled so that it doesn't get react with air....Hope this helps

ANSWER

How i preapare org. Chemistry

Posted by skha****@***** 5 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Pragati Saini 5 years, 11 months ago

Do only ncert intext,, unsolved ,, solved and back exercise and read chapter thoroughly ... And important point ncert exampler also ...... If these all questions are on ur tips then u will score high marks in organic chemistry kkk

ANSWER

Short notes on Vicinal

Posted by Bablu Raj 5 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Amandeep Sethi 5 years, 11 months ago

The hydrocarbons in which same group like halogens are attached to adjacent carbons like 1,2 dichloro ethane

ANSWER

Why are d-block elememts know as transition elements

Posted by Amisha Singh 5 years, 11 months ago

CBSE > Class 12 > Chemistry

3 answers

Parul Singh 5 years, 11 months ago

Because of incompletelly filled d- orbital.

Shubham Sharma 5 years, 11 months ago

The d block elements are called transition elements because the electrons make transition from lower energy state to higher for being added to d block

Yogita Ingle 5 years, 11 months ago

The position of d-block elements is in between the s-block and p-block elements in the periodic table. These d-block elements are called transition elements because they exhibit transitional behaviour between s-block and p-block elements.

Their properties are transitional between highly reactive metallic elements of s-block which are typically ionic compounds and the elements of p-block which are largely covalent.

ANSWER

Explain I.E.2 is higher than those of group 15 due to smallet size of the ions and greater effective nuclear charge. Down the group I.E. decreases.

Posted by Harshita Yadhuvanshi 5 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Why does a solution containing nin volatile solute have higher boiling point than pure solvent

Posted by Utkarsh Kumar 5 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 5 years, 11 months ago

The boiling point of substance can be defined as, it is the temperature at which the vapour pressure of the substance equal to atmospheric pressure. According to Raoult's law, the vapour pressure of a solvent decreases in the presence of a non-volatile solute. Thus, the vapour pressure of a solution containing a non-volatile solute requires a high temperature to become equal to the atmospheric pressure. That is why the boiling point of a solution containing a non-volatile solute increases. Thus, the solution containing a non-volatile solute has a higher boiling point than a pure solvent. Example of non-volatile solute sugar, NaCl. etc.
Elevation in boiling point is a colligative property, as it depends on the number of solute particles present in a solution.

ANSWER

Concentration of solution of solid in liquid

Posted by Prit Singh 5 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Physical properties of aldehydes

Posted by Baldev Singh 5 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Rishabh Gupta 5 years, 11 months ago

*they are colourless and have pleasant smell *Lower aldehydes are soluble in water because they form hydrogen bonding with water molecule *aldehyde are polar and the dipole moment of ketone is more than aldehyde because two + I group increase the polarity of c -o bond in ketone *due to dipole dipole intermolecular force of attraction aldehyde have high melting point and boiling point .the melting point and boiling point of an isometric ketone are higher than that of aldehyde

Rishabh Gupta 5 years, 11 months ago

*formaldehyde is gas other lower aldehyde are liquid *

ANSWER

Blue print of chemistry paper of class 12 cbse

Posted by Sahdev Shekhawat 5 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Utkarsh Kumar 5 years, 11 months ago

Any chapter wise weightage is not given....but a group of chapters or unit has marks as 1st 4 chp. 23 mrks... nxt 4 carry 18 and organic carry 28 marks..

ANSWER

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