Previous Question Papers of HSC Maharashtra Board Science

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The complex ion [Co(H2O)5 (ONO)]2+ and [Co(H2O)5NO2)]2+ are called:

(A) linkage isomer
(B) ionisation isomer
(C) co-ordination isomer
(D) geometrical isomer

Inflammation of tongue is due to the deficiency of:
(A) Vitamin B1

(B) Vitamin B2

(C) Vitamin B5

(D) Vitamin B6

Identify the compound ‘B’ in the following series of reaction: propanenitrile Na / alc
A
NaNO
2
dil.HCl
B.

(A) n-propyl chloride
(B) Propanamine
(C) n-propyl alcohol
(D) Isopropyl alcohol



Answer any THREE of the following:

i. Write the different oxidation states of mangan
ese. Why + 2 oxidation state of manganese is more
stable?
ii. How are the following compounds prepared?
a. benzaldehyde from benzene
b. acetophenone from benzene
c. benzaldehyde from benzoyl chloride
iii. Define complex lipids and write the structures of nucleotide and nucleoside.
iv. Write the fomulae of the following compounds
a. Sodium hexanitrito– N – cobaltate (III)
b. Tetraaquodichlorochromium (III) chloride
c. Potassium tetracyanoaurate (III) ion

Answer any ONE of the following:
i. a. Explain the following terms:
1. Homopolymers
2. Elastomers
b. Explain the mechanism of cleansing action of soaps.
c. Write balanced chemical equations for the action of
1. phosphorous trichloride on propan-2-ol
2. hydrogen bromide on styrene in the presence of a peroxide
3. methyl bromide on silver propanoate
ii. a. Write a short note on Hoffmann bromamide degradation.
b. Explain the mechanism of action ofhydroiodic acid on 3-methylbutan-2-ol.
c. Mention ‘two’ uses of propan-2-one.

Chemistry Previous Question Papers of HSC Maharashtra Board Science