Maharashtra State Board 12thChemistry Mock Test Paper Sol

7/23/2019 Maharashtra State Board 12thChemistry Mock Test Paper Sol

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Page 2 of 14

1. Select and write the most appropriate answer from the given alternatives for each subquestion :[7]

(i) Paramagnetism is a property of : (1)

(a) Completely filled electronic sub-shells (b) Unpaired electrons

(c) Non-transition elements (d) Melting point and boiling point of elements

(ii) The molal freezing poing constant for water is 1.86 / C mol . If 342 gms of cane sugar ( )12 22 11C H Ois dissolved in 1000g of water, the solution will freeze at .................... (1)

(a) 3.92 C (b) 1.86 C (c)1.86 C (d) 2.42 C

(iii) For a first order reaction A products, if kis the rate constant, then the half life period of thereaction is equal to (1)

(a)

[ ]

0.693

k A(b)

[ ]

1 1.

k A(c)

[ ]

[ ]

1ln

A

k A(d)

ln 2

k

(iv) 31 10 g atoms of Ag can be oxidised to Ag + ions by passing the electricity of ................ (1)

(a) 0.001 Faraday (b) 0.1 Faraday (c) 1 Faraday (d) 1000 Faraday

(v) Chemical formula of copper pyrites is ............... (1)

(a) 2CuFeS (b) 2Cu S (c) 2Cu O (d) 3 2. ( )CuCO Cu OH

(vi) Two neutrons are introduced in the nucleus of an atom. The resulting atom and the parent atom forma pair of .............. (1)

(a) isobars (b) isotopes (c) isomers (d) isotones

(vii) Which of the following properties is intensive ? (1)

(a) enthalpy (b) entropy (c) volume (d) refractive index

2. Attempt the following (Any Six) : [12]

(i) Define the terms : (2)

(a) Intrinsic energy

(b) Heat of reactions at constant pressure and volume.

(ii) Distinguish between the rate of a reaction and the rate constant. (2)

(iii) Explain :

(a) Normality (b) Molarity (2)

(iv) With the help of catalytic hydrolysis of methyl acetate, explain the pseudo first order reaction. (2)

(v) Explain the types of thermal energy. (2)

Time : 3 Hrs. M.M. : 70

(i) All questions are compulsory.

(ii) Internal choice is given to Q. 2,3 and 4.

(iii) Use of calculator is not allowed.

(iv) Section I and Section II has weightage of 35 marks each.


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Page 3 of 14

(vi) Write down the reactions taking place during discharging of lead accumulator. (2)

(vii) Draw a neat and labelled diagram for standard Hydrogen gas electrode. (2)

(viii) Give important ores of zinc metal. (2)

3. Attempt the following (Any Three) [9]

(i) What are fuel cells ? Give construction and working of2 2H O fuel cell. (3)

(ii) The heat of formation of carbondioxide and carbon monoxide are 1396.6kJmol and 110.5 kJ permole respectivley at constant pressure and at 296 K. Calculate the heat of combustion of carbon

monoxide at constant volume and at 298K, if R = 1 18.314JK mol . (3)

(iii) How is 2SO an air pollutant ? (3)

(iv) Calculate the osmatic pressure at 288 K of a solution of urea ( )2 2NH CONH containing 33 10 kgof it into half litre of the solution. (3)

4. (A) (i) How will you determine the molar mass of a non-volatile substances by Landsberger and Walkermethod. (4)

(ii) Write the cell reaction and find E.M.F of the following cell at 298 K. (3)

Z naq

Z n + +

1a =

aqC u + +

1a = ( )sC u

0 00.76 , 0.34Zn CuE V E V= =

OR

(B) (i) Define the rate- law . (1)

(ii) The decy constant of a radio element is 24.62 10 per hour. What fraction of it will remain after 40hours. (3)

(iii) Calculate the enthalpy change for the formation of 5.4kg of water form the following reaction (data):

( ) ( ) ( )22 2

1

2g g l

H O H O+ , 1284.5H kJmol = (3)

5. Select and write the most appropriate answer from the given alternatives for each subquestion :

[7]

(i) Dettol consists of : (1)

(a) Cresol and ethanol (b) Xylenol and terphenol

(c) Chloroxylenol and terpeneol (d) Xylene and terpeneol

(ii) In isomeric alcohols, the correct order of boiling point is : (1)

(a) 2 3 1 > > (b) 3 2 1 > > (c) 1 2 3 > > (d) 2 1 3 > > (iii) Which of the following is an oil ? (1)

(a) Triolein (b) Tripalmitin (c) Tristearin (d) all of them

(iv) The correct order of increasing reactivity of H X towards alkenes is : (1)

(a) HF HBr HI HCl< < < (b) HF HBr HCl HI<

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Maharashtra State Board 12thChemistry Mock Test Paper Sol