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Question Paper - Chemistry 2012 - 2013-H.S.C-12th Board Exam Maharashtra State Board (MSBSHSE)

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Marks: 70
Q: 1 | Select and write the most appropriate answer from the given alternatives for each sub-question:[7]
Q: 1.1[1]

In body centred cubic structure the space occupied is about

(A) 68%                                                     (B) 53%

(C) 38%                                                     (D) 32%

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Q: 1.2[1]

For a gaseous reaction the unit of rate of reaction is

(A) L atm s-1

(B) atm mol-1 s-1

(C) atm s1

(D) mol s

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Q: 1.3[1]

Which of the following compounds contain S = O as well as S = S bonds?

(A) Sulphuric acid

(B) Thiosulphuric acid

(C) Sulphurous acid

(D) Thiosulphurous acid

 

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Q: 1.4[1]

Which of the following solutions shows maximum depression in freezing point?

(A) 0.5 M Li2SQ4

(B) 1 M NaCl

(C) 0.5 M A12(SO4)3

(D) 0.5 MBaC12

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Q: 1.5[1]

For a chemical reaction ΔS=0.035 kJ/k and ΔH=20kJ.

(A) 5.14 K

(B) 57.14 K

(C) 571.4 K

(D) 5714.0 K

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Q: 1.6[1]

The standard e.m.f of the following cell is 0.463 V

`Cu|Cu_(1m)^(++)`

What is the standard potential of Cu electrode?

(A) 1.137 V

(B) 0.337 V

(C) 0.463 V

(D) - 0.463 V

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Q: 1.7[1]

Fe2O3 is reduced to spongy iron near the top of blast furance by

(A) H2

(B) CaO

(C) SiO2

(D) CO

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Q: 2 | (A) Answer any SIX of the following[12]
Q: 2.1[2]

Distinguish between crystalline solid and amorphous solid

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Q: 2.2[2]

State Kohlrausch Law and write mathematical expression of molar conductivity of the given solution at infinite dilution.

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Q: 2.3[2]

Write cell reaction in lead storage battery during discharge.

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Q: 2.4[2]

Draw structure and write geometry of PCl3 and PCl5.

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Q: 2.5[2]

Prove that ΔH=ΔU+ΔnRT. what is the condition under which ΔU=ΔH?

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Q: 2.6[2]

Mention names and formulae of two ores of alumunium.

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Q: 2.7[2]

Derive the relationship between relative lowering of vapour pressure and molar mass of nonvolatile solute.

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Q: 2.8[2]

What is pseudo first order reaction? Give one· example of it.

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Q: 3 | Answer any THREE of the following:[9]
Q: 3.1[3]

Calculate the mole fraction and molality of HNO3 in solution contaning 12.2%HNO3 (Given atomic mases:H=1, N=13,O=16)

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Q: 3.2[3]
 

Consider the reaction-

`3barI_((aq))+S_2O_8^(2-)->I_(3(aq))^-`

At particular time t, `(d[SO_4^(2-)])/dt=2.2xx10^(-2)"m/s"`

What are the values of the following at the same time?

a. `-(d[I^-])/dt`

b. `-(d[S_2O_8^(2-)])/dt`

C. `-(d[I_3^-])/dt`

 

 
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Q: 3.3[3]

300 M mol of perfect gas occupies 13 L at 320 K. Calculate the work done in joules when the gas expands-

(a) isothermally against a Constant external pressure of 0.20atm.

(b) isothermal and reversible process.

(c) into vaccum until the volume of gas is increased by 3L (R=8.314J mol-1 K-1)

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Q: 3.4[3]

What is the action of following regents on ammonia?

a. Excess of air

b. Excess of chlorine

c. Na Metal

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Q: 4 | Answer any one of the following[7]
Q: 4.1[7]
Q: 4.1.1 | Explain with reason sign conventions of ΔS in the following reactions:[2]
Q: 4.1.1.1[1]

Explain with reason sign conventions of ΔS in the following reaction

N2(g)+3H2(g)→2NH3(g)

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Q: 4.1.1.2[1]

Explain with reason sign conventions of ΔS in the following reaction

CO2(g) → CO2(g)

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Q: 4.1.2 | Explain the following terms[2]
Q: 4.1.2.1[1]

Explain the following term

Smelting

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Q: 4.1.2.2[1]

Explain the following term

Flux

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Q: 4.1.3[3]

Gold occurs as face centred cube and has a density of 19.30 kg dm-3. Calculate atomic radius of gold (Molar mass of Au=197)

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Q: 4.2[7]

a. Explain the trends in the following properties with reference to group 16:

1 Atomic radii and ionic radii

2 Density

3 ionisation enthalpy

4 Electronegativity

b. In the electolysis of AgNO3 solution 0.7g of Ag is deposited after a certain period of time. Calulate the quantity of electricity required in coulomb. (Molar mass of Ag is 107.9g mol-1)

c. Define Osmosis

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Q: 5 | Select and write the most appropriate answer from the given alternatives for each sub-question:[7]
Q: 5.1[1]

ln which pair highest oxidation states of transition metals are found:

(A) nitriles and chlorides

(B) fluorides and chlorides

(C) fluorides and oxides

(D) nitriles and oxides

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Q: 5.2[1]

which of the following carbocations is least stable?

(A) 

(B)

(C)

(D)

 

 

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Q: 5.3[1]

Compound having general formula is called

(A) diester

(B) acid anhydride

(C) hemiacetal

(D) acetal

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Q: 5.4[1]
 

The complex ion `[Co(H_2O)_5 (ONO)]^(2+) `

(A) linkage isomer

(B) ionisation isomer

(C) co-ordination isomer

(D) geometrical isomer

 
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Q: 5.5[1]

Inflammation af tongue is due to the deficiency of:

(A) Vitamin B1

(B) Vitamin B2

(C) Vitamin B5

(D) Vitamin B6

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Q: 5.6[1]

Identify the compound 'B' in the following series of reaction:

(A) n-propyl chloride

(B) Propanamine

(C) n-propyl alcohol

(D) Isoproply alcohol

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Q: 5.7[1]

Which of the foUowing reagents is best for the following conversion?

(A) LiAlH4

(B) 

(C) H2/Ni, 453 K

(D) Zn-Hg+HCl(con)

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Q: 6 | Answer any SIX ofthe following[12]
Q: 6.1[2]

Calculate magnetic moment of  `Fe_((aq))^(2+) ion (Z=26).`

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Q: 6.2[2]

How is ethanol prepared from methanal by using Grignard reagent?

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Q: 6.3[2]

Write the chemical reaction to prepare novolac polymer.

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Q: 6.4[2]

Why does p-nitrochlorobenzene undergo displacement reactions readily with attack of nucleophilic HOΘ ion?

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Q: 6.5[2]

What is the action of bromine in alkaline medium on

i. CH3CH2NO2

ii. 

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Q: 6.6[2]

Define antioxidants?

Define antioxidants and mention two examples.

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Q: 6.7[2]

How is 4-methylpent-3en-2-one obtained from propan-2-one?

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Q: 6.8[2]

What are hormones? Write the structure of simple triglycerides.

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Q: 7 | Answer any THREE of the following[9]
Q: 7.1[3]

Write the different oxidation states of manganese. Why + 2 oxidation state of manganese is more stable?

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Q: 7.2[3]

How are the following compounds prepared?

a. benzaldehyde from benzene

b. acetophenone from benzene

c. benzaldehyde from benzoyl chloride

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Q: 7.3[3]

Write the structure of a nucleotide

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Write the structure of a nucleoside

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Define complex lipids

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Q: 7.4[3]

Write the fomulae of the following compounds

a. Sodium hexanitrito- N - cobaltate (III)

b. Tetraaquodichlorochromium (III) chloride

c. Potassium tetracyanoaurate (III) ion

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Q: 8 | Answer any ONE of the following[7]
Q: 8.1[7]

a. Explain the following term:

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

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Q: 8.2[7]

a. Write a short note on Hoffmann bromamide degradation.

b. Explain the mechanism of action of hydroiodic acid on 3-methylbutan-2-ol.

c. Mention 'two' uses of propan-2-one.

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