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

No products in the cart.

Ask questions which are clear, concise and easy to understand.

Ask Question

Which has higher melting point: V or Cr ?

Posted by Mannavan J 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Komal Tatrari 7 years ago

Melting point is directly proportional to no of unpaired electrons Cr has 5 up e in 3d while vanadium has 3

ANSWER

I have 12hrs left for my exam...i have not read anything..can anybody please suggest me what to read...

Posted by Akashita Satapathy 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Ambuj Mishra?? 7 years ago

Do therory chapters like ch-14,15,16,5,6and in chp 1 , 4and 2 learn important formulae so u will get min. 24 marks and see the cbse previous year questions u can pass it...☺

ANSWER

What is galvanization

Posted by Gagan Manwani 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Yogita Ingle 7 years ago

The process of coating Zinc layer on articles made copper or iron or other metals, which gets corrosion when exposed moist air for long time is called galvanization.
Ex: Iron Bridge can be protected from rusting by galvanizing the iron using zinc.

Komal Tatrari 7 years ago

Coating iron objects with the layer of zinc carbonate

ANSWER

Is ncert is enough to get 50+ out of 70 in chemistry board exam

Posted by Priya Mishra 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Akshat Mishra 7 years ago

Yes ?

Tar Ajhei 7 years ago

Yes

ANSWER

How Eu(+2) is reducing reagent

Posted by Himanshu Bhardwaj 7 years ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Imp topics of p block ?!

Posted by Peeyush Sharma 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Rajat Panwar 7 years ago

Structure , reaction and reasoning

ANSWER

Explain Hunsdiecker reaction with an example.

Posted by Harsh Sharma 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Komal Tatrari 7 years ago

When silver salt of carboxylic acid is treated with bromine in the presence of chloroform carbon dioxide + ethyl bromide + silver bromide are formed example when silver salt of ethanoic acid is treated with bromine bromomethane is formed along with agbr and carbon dioxide

ANSWER

what are secondary cells

Posted by Lovepreet Vinayak 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Yogita Ingle 7 years ago

These are batteries that can be recharged after use by passing current through the electrodes in the opposite direction i.e., from the negative terminal to the positive terminal. For example, a lead storage battery that is used in automobiles and inverters can be recharged a limited number of times.

Peeyush Sharma 7 years ago

Cells which are rechargeable !

ANSWER

Give an example which show both frinkal and shottky effect

Posted by Sãñjü Dïdêl 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Taqdees Fatima 7 years ago

Only AgBr shows both defect

Yogita Ingle 7 years ago

AgCl and AgBr shows both effects.
Due to size difference in their atoms they prefer to show Frenkel effect and also
due to largest Coordination no. and missing of ions in the lattice it shows the Schottky effect.

ANSWER

How are haloalkanes classified? Explain with examples.

Posted by Harsh Sharma 7 years ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

On increasing temperature activation energy of a reaction decreases, why?

Posted by Nancy Sehrawat 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Sarvagya Yadav 7 years ago

Because molecules collide with kinetic energies greater than or equal to activation energy

ANSWER

Are the structure of drugs important??

Posted by Anshika Babbar 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Pragati Verma 7 years ago

No

Raj Nathwani 7 years ago

Yes

ANSWER

What does hydration enthalpy mean?

Posted by Snehashish Datta 7 years ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

how many marks questions come from last 10years

Posted by Rakesh Tiwari 7 years ago

CBSE > Class 12 > Chemistry

1 answers

K G 7 years ago

5

ANSWER

Is ncert back and intext questions only is sufficient to score 45+ in chemistry boards?

Posted by Shreya Sharma 7 years ago

CBSE > Class 12 > Chemistry

5 answers

Gajendra Singh Rajput 7 years ago

To score 45+ in chemistry you need to solve ncert back and intext questions+previous year question papers to get a hang of the kind of questions asked in the exams.

Sarvagya Yadav 7 years ago

Yes of course

Shreya Sharma 7 years ago

Why

Gajendra Singh Rajput 7 years ago

No

Ajay Pathak 7 years ago

Yup

ANSWER

Plz tell me about the chapter wise marking scheme

Posted by Ramesh Kumar 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Rishab Bhardwaj 7 years ago

Chapter 1 to 5 =5m each Ch 6 =3m Ch7=8m Ch8=5m Ch9=3m Chapter 10,11,12,13 =18m Ch14,15,16=10m

ANSWER

Give three reaction of glucose which cannot be explained by its chain structure

Posted by Kheem Koranga 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Komal Tatrari 7 years ago

Its pentaacetate doesn't react with hydroxyl amine It doesn't react with Schiff base It doesn't react with NaHSO3 IT DOESN'T SHOW CARBONYL PEAK IN INFRA-RED SPECTROSCOPY

ANSWER

Give some important in organic chemistry

Posted by Dinesh Kumar 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Sandra Suresh 7 years ago

Name rctns and conversion questions

Rishab Bhardwaj 7 years ago

Do all name reaxns Do back excercise questions basically that one in which there is series of reanx and we need to find A to E products.

ANSWER

Chemical test to distinguish between formic acid and acetic acid

Posted by Dinesh Kumar 7 years ago

CBSE > Class 12 > Chemistry

4 answers

Ambuj Mishra?? 7 years ago

Formic acid will give tollens reagent...

Priyanshu Chandola 7 years ago

Acetic acid give carbonate test

Komal Tatrari 7 years ago

Tollens test formic acid wil give tollens test

Suhani Rana? 7 years ago

Iodoform test , acetic acid can give but not formic acid.

ANSWER

Why acetone and chloroform exhibit negative deviation from raults law??

Posted by Rohit Jain 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Harshita Panwar 7 years ago

Due to more strong bond btw them due to which their boiling point are increased

ANSWER

A group 14 element is to be converted into n-type semiconductor by doping it with a suitable impurity.To which group should this impurity belong?

Posted by Pandat Kd 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Rohit Jain 7 years ago

Group 15 element

Aryaman Singh Tomar 7 years ago

Grp-15

ANSWER

Weightage of ch coordination compound...

Posted by Aryaman Singh Tomar 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Gajendra Singh Rajput 7 years ago

3 marks

Kritarth Tripathi 7 years ago

4 marks aur 3 depends on the set

ANSWER

What is meant by Lanthanide contraction. Give its consequence?

Posted by Nishchal Chandel 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Rohit Jain 7 years ago

Poor shielding of 4f electrons led to considerable increment in effective nuclear charge if the atom. This reduces the size of the atom much. And due to 4f electrons are called lanthanides, therefore there contraction is called lanthanides contraction.

ANSWER

What is native protein??

Posted by Kartik Periwal 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Harshita Panwar 7 years ago

Protein found in a biological system with a unique three dimensional structure and biological activity

ANSWER

marls scenerio

Posted by Gb Rana 7 years ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Class 10 science paper

Posted by Rs Pandey 7 years ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What must be the pattern of attempting the question paper of chemistry effectively and how to utilize 15 min reading time ??

Posted by Hanu Saini 5 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Name all the important processes like habers oswald etc.. ??

Posted by Moni // 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Hanu Saini 7 years ago

Related to hot and conc Na0H rxn

ANSWER

HOW TO LEARN METALLURGY!!?

Posted by Ankit Chahal 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Sandra Suresh 7 years ago

Study principles and imp eqns

ANSWER

All name reaction

Posted by Gaurav Binwal 7 years ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Page 228 of 608

myCBSEguide App

myCBSEguide

Trusted by 1 Crore+ Students

Test Generator

Test Generator

Create papers online. It's FREE.

CUET Mock Tests

CUET Mock Tests

75,000+ questions to practice only on myCBSEguide app

Google Play

Download myCBSEguide App