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What is column chromatography

Posted by Satyam Chaudhary 8 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Copper phase refining

Posted by Satyam Chaudhary 8 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Rectified spirit can not be converted into absolute alcohol by simple distillation. Give reason

Posted by Sheetal Wankhede 8 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Rahul Verma 8 years, 2 months ago

because a mixture of 95.4% alcohol with 4.6% water (rectified spirit) forms an azeotrope i.e., a constant boiling mixture.

ANSWER

Practically how can you identify propane-1-ol between propane-1-ol and propane-2-ol?

Posted by Sheetal Wankhede 8 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Varun Narang 8 years, 2 months ago

You can use Lucas reagent ( Hcl + ZnCl2 ) Propane- 1-ol Will not give any turbidity whereas for propane2ol turbidity will be formed after 5 mins

ANSWER

Give a test to distinguish between ethanol and propane

Posted by Sheetal Wankhede 8 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Ritu Dhanda 8 years, 2 months ago

Iodoform test

ANSWER

Why is phenol more acidic than ethanol

Posted by Sheetal Wankhede 8 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Anoop Kumar 8 years, 2 months ago

Becoz phenoxide ion formed is more stable , due to resonace than the ethoxide ion.

ANSWER

Plz give us CBSE class 12th board papar of 2017

Posted by Ajay Bohra 8 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Anushka Tripathi 8 years, 2 months ago

Check last year paper from this app.

ANSWER

What is the formula of stearic acid

Posted by Nayan Chaturvedi 8 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Pratiksha Tiwari 8 years, 2 months ago

C18H36O2

ANSWER

What happen when SO2 gas is passed through acidfied potassium dichromate solution

Posted by Salman Arora 8 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is osmosis and osmotic pressure

Posted by Aryan Singh 8 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Sandeep Singh 8 years, 2 months ago

osmosis-
the phenomenon of flow of solvent particles from low conc. of solution to high conc. of solution through spm is called osmosis.
osmotic pressure- the excess pressure must be applied over solution side in order to prevent osmosis is called o.p.

ANSWER

Why silica is used in extraction of copper

Posted by Aryan Singh 8 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Varun Narang 8 years, 2 months ago

is beacause it converts the impurity of FeO to FeS and removes it through Slag formation. FeS +SiO2 _____> FesiO3 (Slag)

ANSWER

What is the utility of piezoelectric crystals?

Posted by Vaidehi Gupta 8 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Name any two superconducting materials which show superconductivity above 100K.

Posted by Vaidehi Gupta 8 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What type of questions will be asked in my practical examination by the external?

Posted by Vinisha Anand 8 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Mohit Lunkad 8 years, 2 months ago

They will ask of the ques. Among ur basis understanding of your experiments & more till ur syllabus. Noting out of that so dont worry be happy. All the best. ?

Mohit Lunkad 8 years, 2 months ago

Repeated ? Literally bcz they too will have to cover many of the students hence if your roll no. Comes in last then it is benefitial some way the other ?

ANSWER

What type of crystal defect is produced when NaCl is doped with MgCl2 ?

Posted by Vaidehi Gupta 8 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Mohit Lunkad 8 years, 2 months ago

When NaCl is doped with MgCl2, each Mg2+ion replaces 2 Na+ ions to maintain electrical neutrality. One site is occupied by Mg2+ ion while the other remains vacant. Thus, cation vacancies are introduced. This defect is called impurity defect.

Mohit Lunkad 8 years, 2 months ago

Still awake. Superb I think you like late night studies. I too ? Any ways lets come to the que.

ANSWER

Why do metals possess lustre and conduct electric current?

Posted by Vaidehi Gupta 8 years, 2 months ago

CBSE > Class 12 > Chemistry

3 answers

Mohit Lunkad 8 years, 2 months ago

Reason for Lusture: Metals are shiny because metals contain free electrons that vibrate when they come in contact with light. When the electrons vibrate, they produce their own light. This is reflected back and is what creates the shiny, lustrous appearance of metal. Conductivity: Due to presence of free electrons.

Ujjawal Sharma 8 years, 2 months ago

Electric current conductance is due to mobility of free electrons

Sachin Malan Shab 8 years, 2 months ago

Because it have charged

ANSWER

Why are the properties of diamond very different from those of graphite although both are the different forms of the same substance?

Posted by Vaidehi Gupta 8 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Mohit Lunkad 8 years, 2 months ago

Difference in arrangement of subsequent carbon atoms in them.

ANSWER

What is the significance of radius ratio in deciding the structural arrangement in an ionic solid?

Posted by Vaidehi Gupta 8 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Ujjawal Sharma 8 years, 2 months ago

Allows us to predict cation anion coordination number

ANSWER

Why are molecular solids soft and possess low melting and boiling point?

Posted by Vaidehi Gupta 8 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Ujjawal Sharma 8 years, 2 months ago

Because they're held together by weak Van der waals forces

ANSWER

Why ce in +4 o. s changes to ce of +3 o. s instead it is in noble gas configuration. (atomic no. of cesium is 57).

Posted by Shehbaz Khan 8 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Kiran Bala 8 years, 2 months ago

Because for cesium it is a lanthanoid and lanthanoids +3 oxidation state is more stable than+4.

Kiran Bala 8 years, 2 months ago

Because for cesium,it is a lanthanoid and for lanthanoids overall+3oxidation state is more stable than +4.

ANSWER

What is Daniell cell

Posted by Janvi Golechha 8 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Diffrence between sol and emulsion......

Posted by Sharma Saabh 8 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Muskaan Sharma 8 years, 2 months ago

Sol is solid dispersed phase in liquid dispersed medium and emulsion is liquid d.p. in liquid d.m.

ANSWER

Dissociation of K4[Fe(CN)6] 0.1 M solution is 50% at 290K. Calculate the osmotic pressure of the solution.

Posted by Sazia Khan 8 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

How do you

Posted by Shivanshu Yadav 8 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Shivanshu Yadav 8 years, 2 months ago

F9 yr study.....???

Anushka Tripathi 8 years, 2 months ago

I'm fine. How are you. How about ur study.

ANSWER

Iupac name of [Fe(C5H5)2]6

Posted by Aman Kumar 8 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Conversion of propane nitrile to diethyl ketone

Posted by Sahil Singh 8 years, 2 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Molecular solids are usually

Posted by Shubham Jha Jha Shubham Sourabh 8 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Shubham Jha Jha Shubham Sourabh 8 years, 2 months ago

Volatile

ANSWER

What is the significant of red phosphorous in HVZ reaction

Posted by Tanisha Brar 8 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Ujjawal Sharma 8 years, 2 months ago

Vaise me ise khaali time me use krta tha Mene yha Abhi ek do din SE use Kiya y .do promise . sorry sister. This is last. I requested u

Ujjawal Sharma 8 years, 2 months ago

I quit it it really sister,lekin Kisi ko btana mat please ,kashkar Bhaiyya ko.varna vi naraz ho jayenge

ANSWER

Convert 2-Bromobutane into But-2-ene

Posted by Prateek Raj 8 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Nikhil Agarwal 8 years, 2 months ago

alc.kOH

ANSWER

What is Ellingham diagram???

Posted by Abc Efg 8 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Abc Efg 8 years, 2 months ago

Thanks

Ujjawal Sharma 8 years, 2 months ago

It is a graph of Gibb's Free energy versus Temperature. Shows temperature dependency of stability for compounds.

ANSWER

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