AHSEC| CLASS 12| CHEMISTRY| SOLVED PAPER - 2016| H.S. 2ND YEAR
2016
CHEMISTRY
(Theory)
Full Marks: 70
Pass Marks: 21
Time: Three hours
The figures in the margin indicate
full marks for the questions.
1. Name one substance other than hydrogen that can be used for constructing fuel cells. 1
Ans:- Besides hydrogen, two other substances that can
be used to manufacture fuel cells are methane and methanol.
2. The curve showing the variation of adsorption with pressure
at constant temperature is called Adsorption
isotherm. (Fill in the blank) 1.
3. What are ores? Name one sulphide ore. 1
Ans:- That mineral, from which metal can be extracted
economically and conveniently, is called ore.
Copper pyrites
(CuFeS2).
4. Mention the basicity of H3PO4. 1
Ans:- H3PO4 is a tribasic acid.
5. Define enantiomers. 1
Ans:- Optical isomers that are non-superimposable
mirror images of each other are called enantiomers.
6. Write the structural formula of propane– 1, 2,
3-triol. 1
7. Arrange the following in increasing order of pKa
values:
CH3COOH,
CICH2COOH, CI2CHCOOH, CI3CCOOH. 1
Ans:- CI3CCOOH < CI2CHCOOH
< CICH2COOH < CH3COOH.
8. Name two carbohydrates which act as bio-fuels. ½+½=1
Ans:- Sucrose, starch.
9. Define semiconductors. Name the kind of semiconductor
formed when Si is doped with Ga. 1+1=2
Ans:- The substances whose conductivity lies between
that of conductors and insulators are called semiconductors. These have
conductivity values ranging from 
When Si is doped
with Ga, a P-type semiconductor is formed.
10. Calculate atomic radius of elementary silver which
crystallises in facecentered cubic lattice with unit cell edge length 4.086x10-10m.
2
Ans:-
Or
Aluminium
crystallises as face-centered cubic lattice and it has a density of 2.7x103kgm-3.
Calculate edge length of the unit cell. Given atomic mass of aluminium equal to
27.0 amu. 2
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