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CBSE Class 12th Chemistry Solved Question Paper 2013 Set-1

 18-JUL-2013

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Some solved questions from CBSE Class 12th Chemistry Solved Question Paper (Set-1) are given here

Q. Of physisorption or chemisorption, which has a higher enthalpy of adsorption?

Answer. Chemisorption has a higher enthalpy of adsorption.

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Q. Name the method used for refining or copper metal.

Answer. Electrolytic method is used for refining of copper metal.

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Q. What are the products of hydrolysis of sugar?

Answer. Sucrose & Glucose

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Q. Account for the following:

(i) Schottky defects lower the density of related solids.

(ii) Conductivity of silicon increases on doping it with phosphorus.

Answer.

(i) Schottky defect is a vacancy defect which is shown by ionic solids. In this defect, an equal number of cations and anions are missing from their sites to maintain electrical neutrality. This leads to decrease in the density of a substance.

(ii) Silicon contains four valence electrons in its valence shell. When doped with phosphorus which is a group 15 element. Phosphorus contains five valence electrons which occupy some of the lattice sites in silicon. Four out of five electrons are used in the formation of four covalent bonds with the four silicon atoms. The fifth electron is extra and becomes delocalised. These delocalised electrons increase the conductivity of doped silicon

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Q.

(a) Name the method used for removing gangue from sulphide ores

(b) How is wrought iron different from steel?

Answer.

(a) Froth floatation method

(b) Wrought Iron is the purest form of iron & is prepared from cast iron. On the other hand, Steel is an alloy of iron. Steel possesses greater tensile strength than wrought iron.

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By:nayyar ali | On:19-NOV-2014 11:04:01


I want last year solved biology paper


By:Manish Kumar | On:18-OCT-2014 19:38:10


Respected Sir, Kindly provide me the solved question paper of chemistry from 2008 to 2010 . therefore i will be obliged to you for this.


By:SATISH KUMAR | On:01-OCT-2014 11:38:25


please send previous board class xii papers from 2008 to 2014


By:akanksha aggarwal | On:18-SEP-2014 09:56:10


i need cbse board paper of 2008 to 2010 immediately .please send on my id a very humble request to u.


By: Anish jha | On:09-MAR-2014 08:11:32


Chem. ka paper available nhi he kya


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