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Question Paper - Chemistry 2014 - 2015-H.S.C-12th Board Exam Maharashtra State Board (MSBSHSE)

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

The Arrhenius equation is_________________ .

(a)`k=Ae^(RT/E_a)`                                                    

(b)`A=ke^(-E_a/(RT))`

(c)`k=Ae^(-(RT)/E_a)`

(d)`k=Ae^(-E_a/(RT))`

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Q: 1.2[1]

If the enthalpy of vaporisation of water at 100oC is 186.5 J.mol-1, the entropy of vaporization will be_____________ .

(a) 4.0 J . K-1. mol-1                                               

(b) 3.0 J . K-l.  mol-1

(c) 1.5 J - K-1. mol-1                                             

(d) 0.5 J . K-l. mol-1

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Q: 1.3[1]

The atomicity of sulphur in orthorhombic sulphur is______________ .

(a) 8                                

(b) 6                                 

(c)  4                                

(d)  2

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Q: 1.4[1]

The major binding force in diamond is_______________ .

(a) Covalent bond                                                  

(b)  Ionic bond

(c) Metallic bond                                                   

(d)  Co-ordinate covalent bond

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Q: 1.5[1]

The boiling point of water at high altitude is low. because________________ .

(a) the temperature is low.                                         

(b) the atmospheric pressure is low.

(c) the temperature is high.

(d) the atmospheric pressure is high

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Q: 1.6[1]

The molar conductivity of cation and anion of salt BA are 180 and 220 mhos respectively. The molar conductivity of salt BA at infinite dilution is_____________ .

(a) 90 mhos.cm2                                                                             

(b) 110 mhos.cm2.mol-1

(c) 200 mhos.cm2.mol-1                                                                 

(d) 400 mhos.cm2.mol-1

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Q: 1.7[1]

What is the process in which concentrated ore is reduced to the corresponding metal by heating at high temperature with a reducing agent?

(a) Polling                      

(b) Pyrometallurgy

(c) Hydrometallurgy

(d) Calcination

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

Describe anomalous behaviour of oxygen as compared with other elements of group 16 with reference to -

(a) Magnetic property                                        

(b) Oxidation state

(c) Hydrides

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Q: 2.2[3]

What is the value of for the following reaction at 298 K -

6CO2+ 6H20(l) → C6H1206(s) + 602(g),

Given that: ΔG° = 2879 kj mol-1, AS = -210 JK-1 mol-1.

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Q: 2.3[3]

Sucrose decomposes in acid solution to give glucose and fructose according to the first order rate law. The half life of the reaction is 3 hours. Calculate fraction of sucrose which will remain after 8 hours.

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Q: 2.4[3]

A solution containing 0.73 g of camphor (molar mass 152 g . mol-1) in 36.8 g of acetone (boiling point 56.3°C) boils at 56.55°C. A solution of 0.564 g of unknown compound in the same weight of acetone boils at 56.46oC. Calculate the molar mass of the unknown compound.

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

Describe triclinic crystal lattice with the help of a diagram.

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Q: 3.2[2]
Q: 3.3[2]

State and explain Hess’s law of constant heat summation.

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Q: 3.4[2]

Distinguish between : Order and Molecularity of reaction

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Q: 3.5[2]

With the help of the equation ΔG° = - nFEocell. Explain that cell potential is an intensive property.

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Q: 3.6[2]

Describe the laboratory method of preparation of ammonia

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Q: 3.7[2]

Define van’t Hoff factor. How is it related to the degree of dissociation?

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Q: 3.8[2]

Write chemical formulae of the following ores :

(a) Calamine 

(b) Haematite                     

(c) Magnetite

(d) Corundum

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Q: 4 | Answer any ONE of the following:[7]
Q: 4.1[7]

Write the reactions involved in extraction of silver from its ore by leaching process. Derive the equation : W = - PextAV

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A unit cell of iron crystal has edge length 288 pm and density 7.86 g.cm-3. Find the number of atoms per unit cell and type of the crystal lattice.

Given : Molar mass of iron = 56 g.mol-1; Avogadro's number NA = 6.022 x 1023.

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Q: 4.2[7]

Define : Cryoscopic constant.

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What is the action of hot/concentrated nitric acid on -              

(a) Arsenic   

(b) Antimony.

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Draw the structure of: Orthophosphoric acid 

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How much electricity in terms of Faraday is required to produce :

(a) 20 g of Ca from molten CaCl2                     

(b) 40 g of Al from molten Al203

(Given : Molar mass of Calcium and Aluminium are 40 g.mol-1 and 27 g.mol-1 respectively.)

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Draw the structure of: Pyrophosphoric acid

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

Which of the followings is a trihydric alcohol ?

(a) n-propyl alcohol

(b) Glycerol                         

(c)  Glycol                       

(d) Glycine

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Q: 5.2[1]

Alkyl halides are -

(a) Mono halogen derivatives of alkanes 

(b) Di halogen derivatives of alkanes

(c) Tri halogen derivatives of alkanes

(d) Tetra halogen derivatives of alkanes

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Q: 5.3[1]

Mohr’s Salt is -

(a) Ferrous ammonium sulphate

(b) Ferrous sulphate

(c) Ammonium sulphate

(d) Ferric sulphate

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Q: 5.4[1]

Which of the following is polyamide ?

(a) Teflon

(b) Nylon  6,6

(c) Terylene

(d) Bakelite

 

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Q: 5.5[1]

Vitamin ‘C’ belongs to the class of—

(a) Vitamins of aliphatic series

(b) Vitamins of aromatic series

(c) Vitamins of alicyclic series

(d) Vitamins of heterocyclic series

 

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Q: 5.6[1]

What is the IUPAC name of 

(a) α - Amino butanoic acid                                          

(b) 2 - Amino butyric acid

(c) α - Amino butyric acid                                          

(d) 2 - Amino butanoic acid

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Q: 5.7[1]

Which among the following molecular formulae represents urotropine?

(a) C6H12N4

(b) C6H24H4                    

(c) C6H12N4O2

(d) C6H24N4O2

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Q: 6 | Answer any THREE of the following[9]
Q: 6.1[3]

Write the structures of - 3-chloro-3-ethylhex-1-ene

 

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Write the structures of -1-Iodo-2, 3-dimethylbutane

 

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Write the structures of - 1, 3, 5 - tribromobenzene

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Q: 6.2[3]

What is the action of acidified potassium dichromate on -

(a) S02

(b) KI 

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Draw structure of dichromate ion

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Q: 6.3[3]

Describe laboratory method for preparation of glucose.

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Write the reaction that indicates the presence of -CHO group in glucose

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Q: 6.4[3]

What will be the action of the mixture of sodium nitrite and dilute hydrochloric acid on -

(a) ethyl amine

(b) aniline

(c) triethyl amine

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Q: 7 | Answer any SIX of the following :[9]
Q: 7.1[2]

What are chemical twins? Write ‘two’ examples.

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Q: 7.2[2]

Explain the term Antiseptics

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Explain trem Analgesics.

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Q: 7.3[2]

Draw the simple Fisher projection formulae of D - (+) - glucose and D - (-) — fructose

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Q: 7.4[2]

Classify the following ligands into monodentate and polydentate —

  1. Ammonia
  2. Carbon monoxide
  3. Ethylene diamine
  4. Ethylene diamine tetra acetate ion
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Q: 7.5[2]

State and explain Markownikoff's rule with suitable example

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Q: 7.6[2]

How are propan-1-amine and propan-2-amine prepared from oxime?

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Q: 7.7[2]

Identify ‘A' and ‘B’ in the following reaction :

C6H5MgBr + C02 `(`> ‘A’   `(PCl_5)/()`> ‘B’

 

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Q: 7.8[2]

What is the action of the following reagents on phenol -

(a) Bromine in CS2 at low temperature.

(b) H2S04 at room temperature.

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

Write balanced chemical equations for action of ammonia on - (a) formaldehyde (b) acetaldehyde (c) acetone

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Q: 8.2[7]

Write ‘four’ characteristics of co-ordinate complex ion.

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How is Nylon 6, 6 prepared?

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Write any ‘two' uses of terylene.

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Write ‘four’ physical methods of preserving food materials

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