STD 12 Chemistry 2 Board Question Paper Maharashtra Board
STD 12 Chemistry 2 Board Question Paper Maharashtra Board
STD 12 Chemistry 2 Board Question Paper Maharashtra Board
BOARDQUESTIONPAPER :MARCH2015
Note:
i. All questions are compulsory.
ii. Answers to the two sections are to be written in the same answer book.
iii. Figures to the right hand side indicate full marks.
iv. Write balanced chemical equations and draw neat and labelled diagrams, wherever necessary.
v. Use of logarithmic table is allowed.
vi. Answer to every question must be started on a new page.
SECTION II
Q. 5. Select and write the most appropriate answer from the given alternatives for each
sub-question: [7]
ii. Which of the following complexes will give a white precipitate on treatment with a solution
of barium nitrate?
(A) [Cr(NH3)4SO4]Cl (B) [Co(NH3)4Cl2]NO2
(C) [Cr(NH3)4Cl2]SO4 (D) [CrCl2(H2O)4]Cl
iv. Primary and secondary nitroalkanes containing -H atom show property of ________.
(A) chain isomerism (B) tautomerism
(C) optical isomerism (D) geometrical isomerism
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Std.XIISci.:PerfectChemistryII
Q.6. Answer any SIX of the following : [12]
i. Write a note on Friedel Crafts acylation.
ii. How is ethylamine prepared from methyl iodide?
iii. What are antibiotics? Give two examples.
iv. Explain, why are boiling points of carboxylic acids higher than corresponding alcohols.
v. How are proteins classified on the basis of molecular shapes?
vi. What are interstitial compounds? Why do these compounds have higher melting points than
corresponding pure metals?
vii. Write the structures and IUPAC names of the following compounds:
a. Adipic acid
b. -methyl butyraldehyde
viii. Explain with examples, branched and linear polymers.
Q.7. Answer any THREE of the following: [9]
i. On the basis of valence bond theory explain the nature of bonding in [CoF6]3 ion.
Write the IUPAC name of [Co(NO2)3 (NH3)3].
ii. Define lanthanoid contraction. Explain its effects.
iii. Write mechanism of Aldol addition reaction.
iv. Define carbohydrates. What are reducing and non-reducing sugars?
Q.8. Answer any ONE of the following: [7]
i. Write a note on Gabriel phthalimide synthesis.
What are biodegradable polymers and non-biodegradable polymers? Write one example of
each.
Explain cationic detergents.
ii. How is carbolic acid prepared from the following compounds:
a. Aniline
b. Chlorobenzene and steam at 698 K?
Draw structure of DDT. Write its environmental effects.
Mention two physical properties of carbolic acid.
500
BoardQuestionPaper:October2015
BOARDQUESTIONPAPER :OCTOBER2015
Note:
i. All questions are compulsory.
ii. Answers to the two sections are to be written in the same answer book.
iii. Figure at the right hand side indicate full marks.
iv. Write balanced chemical equations and draw neat and labelled diagrams, wherever necessary.
v. Use of logarithmic table is allowed.
vi. Answer to every new question must be started on a new page.
SECTION II
Q.5. Select and write the most appropriate answer from the given alternatives for each
sub-question: [7]
i. Which among the following reducing agents is NOT used to reduce acetaldehyde to ethyl
alcohol?
(A) Na-Hg and water (B) Zn-Hg and conc. HCl
(C) H2-Raney Ni (D) LiAlH4/H+
ii. Acetaldehyde, when treated with which among the following reagents does NOT undergo
addition reaction?
(A) Ammonia (B) Hydroxylamine
(C) Ammoniacal silver nitrate (D) Semicarbazide
501
Std.XIISci.:PerfectChemistryII
iii. How are the following compounds prepared?
a. Benzyl alcohol from benzyl chloride.
b. Propan-1-ol from propanal
iv. What is the position of iron (Z = 26) in periodic table? Explain why is Fe3+ more stable than
Fe2+?
502
BoardQuestionPaper:March2016
BOARDQUESTIONPAPER:MARCH2016
Note:
i. All questions are compulsory.
ii. Answers of both the sections should be written in same answer book.
iii. Draw well labelled diagrams and write balanced equations wherever necessary.
iv. Figures to the right indicate full marks.
v. Use of logarithmic table is allowed.
vi. Every new question must be started on a new page.
SECTION II
504
FunctionalGroupsofOrganicCompounds
Representation of the
No. Class of the compound Functional group Example
class (General formula)
i. Alkanes RH CH3 CH3
(Saturated) C C Ethane
xi. Aldehydes C H H C H
R C H
O O O
(Formyl or aldehydic) Formaldehyde
CH3 C H
O
Acetaldehyde
xii. Ketones C R C R CH3 C CH3
O O O
(Keto or oxo) Acetone
O O O
(Carboxyl group) Formic acid
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Std.XIISci.:PerfectChemistryII
O O O
(Amido group) Acetamide
506
NOTES
NOTES