Jagran Josh Logo

CBSE Class 12th Chemistry Set I solved Question Paper 2012

Dec 13, 2012 11:36 IST

CBSE Chemistry Set- I Solved Question Paper 2012, given here.

Here you can find Chemistry Solved Question Paper. Save your time and take the help while solving the Chemistry question paper set-I this paper will help you in scoring exceptionally well mark in Chemistry paper

Some solved questions from CBSE Class 12th Chemistry Question Paper (Set-I) are given here

Q. How the conductivity of an intrinsic semiconductor may be increased?

Answer. The conductivity of an intrinsic semiconductor can be increased by doping that is adding appropriate amount of suitable impurities in the semiconductor.

To get the CBSE class 12th GUESS PAPERS, Click Here

Q. Define ‘Peptization’.

Answer. Peptization: - It can be defined as the process of converting a precipitate into colloidal sol by shaking it with dispersion medium in the presence of small amount of electrolyte. The electrolyte used is known as peptizing agent.

To get the CBSE class 12th PRACTICE PAPERS, Click Here

Q. How is copper extracted from a low grade ore of it?

Answer. Copper can be extracted from a low grade ore of it through the process of bacterial leaching.

To get the CBSE class 12th SAMPLE PAPERS, Click Here

Q. Differentiate between disinfectants and antiseptics.

Answer. Antiseptics: - They are applied to the living tissues such as wounds, cuts. For example-dettol, iodoform

Disinfectants: - They are applied to inanimate objects such as floors. For example-   sulphur dioxide in very low concentration.

Same substance can act as an antiseptic & disinfectant by varying the concentration.

To get the CBSE class 12th QUESTION PAPERS, Click Here

Q. Which methods are usually employed for purifying the following metals:
(i) Nickel
(ii) Germanium
Mention the principle behind each one of them?

Answer. I. Nickel can be extracted with the help of mond process.

Principle of Mond Process: - in this method the metal is converted into its volatile compound & collected elsewhere. After that it is decomposed to give pure metal.

II. Germanium is extracted with the help of zone refining.

Principle of Zone Refining: - this method is based on the fact that the impurities are more soluble in the melt than in the solid state of the metal.

To get the CBSE class 12th NCERT SOLUTIONS, Click Here

Q. What are food preservatives? Name two such substances.

Answer. Food preservatives: - They help in preventing spoilage of food due to microbial growth. For example-table salt, sugar, vegetable oils, sodium benzoate etc.

To get complete Solved paper Click Here

  • Citing safety concerns, non-Kashmiri students demand
  • They are also calling for action against cops who lathicharged students
  • NIT campus has been tense since students clashed over Indias T20 defeat

Post Comment
17 Comment

swati pathak,




ritu singh ,

kya bakwaas h question paper kahan h ????????????

abhishek anand,


ramya reddy,

u should improve ur righting of answers . sometimes it doesnot match with the textbook

Sagnik Chakraborty,

Please We need Some MCq




i like this


i want 2011 question paper of class 12 of physics and chemistry unsolved


i want last five years question bank with answers !!!!!!!!!!!!!!!!!!


i want last five years question paper with solutions.......

neha barnwal,

hye.. i want last three years cbse solved question papers of class 12 of maths. thnk u.

rishabh pahwa,

hi, i want a last five years cbse solved quation papers of class 12 of economics. thnking you


i m ncert student'please tell me how i preapare physics chemistry



Rajendra singh rawat,

I'm NCRT student how am i prepare for exam in science maths


please give me of 12th

Suggested Colleges

Latest Videos

Register to get FREE updates

    All Fields Mandatory
  • (Ex:9123456789)
  • Please Select Your Interest
  • Please specify

  • By clicking on Submit button, you agree to our terms of use
  • A verifcation code has been sent to
    your mobile number

    Please enter the verification code below

Newsletter Signup
Follow us on

Register to view Complete PDF