# Question Paper - Chemistry 2013 - 2014-H.S.C-12th Board Exam Maharashtra State Board (MSBSHSE)

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SubjectChemistry
Year2013 - 2014 (March)

Topics
Marks
Topics
Marks

Marks: 70
Q: 1 | Answer any ONE of the following[7]
Q: 1.1[7]

Define cell constant.

What is the cell constant?

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Q: 1.2[7]

What is calcination?

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Write molecularity of the followiug reaction:

2NO(g)+O2(g)→2NO2(g)

What is 'calcination'? How does it differ from 'roasting"?

Write resonating structures of ozone.

The decomposition of N2O5(g) at 320K according to the following equation follows first order reaction:

N_2O_(5(g))->2NO_(2(g))+1/2O_(2(g))

The initial concentration of N2O5(g) is 1.24 x 10-2 mol. L-1 and after 60 minutes 0.20x10-2 mol L-1. Calculate the rate constant of the reaction at 320K.

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Q: 2 | Answer any THREE of the following:[9]
Q: 2.1[3]
Q: 2.2[3]

Calculate the amount of CaCl2 (van't Hoff factor i = 2·47) dissolved in 2·5 L solution so that its osmotic pressure at 300K is 0·75 atmosphere.

Given : Molar mass of CaCl2 is 111g mol-1

R=0.082 L.atm K-1mol-1

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Q: 2.3[3]

Describe anomalous behaviour of fluorine with the other elements of group 17 wilh reference to :

(a) Hydrogen bonding

(b) Oxidation state

(c) Polyhalide ions

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Q: 2.4[3]

Face centred cubic crystal lattice of copper has density of 8.966 g.cm-3. Calculate the volume of the unit cell. Given molar mass of copper is 63.5 g mol-1 and Avogadro number Nis 6.022 x 1023 mol-1

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Q: 3 | Answer any SIX of the following[12]
Q: 3.1[2]

What is the action of the following reagents on ammonia:

(a) Nessler's reagent

(b) Sodium metal

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Q: 3.2[2]

State the first and second law of electrolysis

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Q: 3.3[2]

Draw neat and labelled diagram of Bessermer converter used in the extraction of copper.

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Q: 3.4[2]

Derive the relation between half life and rate constant for a first order reaction

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Q: 3.5[2]

Derive the relation between DeltaG^@and equilibrium constant (K) for the reaction -

aA_bB ⇌ cC+dD.

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Q: 3.6[2]
Q: 3.7[2]

Explain, why do aquatic animals prefer to stay at lower level of water during summer?

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Q: 3.8[2]

Distinguish between crystalline solid and amorphous solid

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Q: 4 | Select and write the most appropriate answer from the alternative given below each sub-quest.ion :[7]
Q: 4.1[1]

To prepare n-type semiconductor the impurity to be added to silicon should have the following number of valence electrons:

(a) 2

(b) 3

(c) 4

(d) 5

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Q: 4.2[1]

Number of faradays of electricity required to liberate 12 g of hydrogen is:

(a) 1

(b) 8

(c) 12

(d) 16

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Q: 4.3[1]

What is molecular formula of oleum?

(a) H2SO3

(b) H2SO4

(c) H2S2O7

(d) H2S2O8

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Q: 4.4[1]

Purification of aluminium by electrolytic refining is carried out by

(a)Hoope process

(b)Hall process

(c)Baeyer process

(d)Serperck process

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Q: 4.5[1]

The rate of reaction for certain reaction is expressed as :

1/3(d[A])/dt=-1/2(d[B])/dt=-(d[C])/dt

The reaction is

(a) 3A→2B+C

(b) 2B→3A+C

(c) 2B+C→3A

(d) 3A+2B→C

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Q: 4.6[1]

A system absorbs 640 1 heat and does work of 260 J, the change in internal energy of the system will be

(a) + 380 J

(b) - 380 J

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Q: 4.7[1]

Which of the following is not a colligative property?

(a) Vapour pressure

(b) Depression in freezing point

(c) Elevation in boiling point

(d) Osmotic pressure

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Q: 5 | Answer any ONE[7]
Q: 5.1[7]
Q: 5.2[7]
Q: 6 | Answer any THREE[9]
Q: 6.1[3]
Q: 6.2[3]
Q: 6.3[3]
Q: 6.4[3]
Q: 7 | Answer any SIX:[12]
Q: 7.1[2]

What is a soap ? How is it prepared?

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Q: 7.2[2]

Identify the compounds 'A' and 'B' in the following equation:

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Q: 7.3[2]

Write a note on self oxidation-reduction reaction of aldehyde with suitable example.

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Q: 7.4[2]

Write names and chemical formulae of monomers used in preparing Buna-S.

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Q: 7.5[2]

Define complex lipids

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Mention 'two' functions of lipids

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Q: 7.6[2]

Distinguish between SN1 and SN2 mechanisms.

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Q: 7.7[2]

What are lanthanoids? What is the position of actinoids in periodic table ?

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Q: 7.8[2]
Q: 8 | Select and write the most appropriate answer from the given alternatives for each sub-question[7]
Q: 8.1[1]

IUPAC name of K4[Fe(CN)6] is

(a) tetrapotassium ferrocyanide

(b) potassium ferricyanide

(c) potassium ferrocyanide

(d) potassium hexacyanoferrate

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Q: 8.2[1]

Carbon atom in methyl carbocation contains how many pairs of electrons?

(a) 8

(b) 4

(c) 3

(d) 5

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Q: 8.3[1]

How many moles of acetic anhydride will be required to form glucose pentaacetate from 2M of glucose?

(a) 2

(b) 5

(c) 10

(d) 2.5

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Q: 8.4[1]

Identify the weakest base amongst the following :

(a) p- methoxyaniline

(b) o-toluidine

(c) benzene - 1, 4 - diamine

(d) 4 - aminobenzoic acid

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Q: 8.5[1]

Bakelite is the polymer of:

(a) Benzaldchyde and phenol

(b) Acetaldehyde and phenol

(c) Formaldehyde and phenol

(d) Formaldehyde and benzyl alcohol

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Q: 8.6[1]

Formalin is 40% aqueous solution of:

(a) Methanal

(b) Methanoic acid

(c) Methanol

(d) Methanamine

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Q: 8.7[1]
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