Previous year question papers of Maharashtra Board for 12th Science

[Nitin Sharma]

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i. In body centred cubic structure the space occupied is about
(A) 68 % (B) 53 %
(C) 38 % (D) 32 %
ii. For a gaseous reaction the unit of rate of reaction is
(A) L atm s-1 (B) atm mol-1 s-1
(C) atm s-1 (D) mol s
iii. Which of the following compounds contains S = O as well as S = S bonds?
(A) Sulphuric acid (B) Thiosulphuric acid
(C) Sulphurous acid (D) Thiosulphurous acid
iv. Which of the following solutions shows maximum depression in freezing point?
(A) 0.5 M Li2SO4 (B) 1 M NaCl
(C) 0.5 M Al2(SO4)3 (D) 0.5 M BaCl2
v. For a chemical reaction ∆S = - 0.035 kJ/K and ∆H = - 20kJ.
(A) 5.14 K (B) 57.14 K
(C) 571.4 K (D) 5714.0 K
vi. The standard e.m.f of the following cell is 0.463 V
(1M) (1M) Cu |Cu ||Ag | ++ + Ag. If O
Ag E = 0.800 V,
What is the standard potential of Cu electrode?
(A) 1.137 V (B) 0.337 V
(C) 0.463 V (D) -0.463 V
vii. Fe2O3 is reduced to spongy iron near the top of blast furance by
(A) H2 (B) CaO
(C) SiO2 (D) CO
TARGET Publications
443 Board Question Paper
Std. XII Sci.: Perfect Chemistry - I
Q. 2. (A) Answer any SIX of the following: [12]
i. Distinguish between crystalline solid and amorphous solid.
ii. State Kohlrausch Law and write mathematical expression of molar conductivity of the given
solution at infinite dilution.
iii. Write cell reactions in lead storage battery during discharge.
iv. Draw structures and write geometry of PCl3 and PCl3.
v. Prove that ∆H = ∆U + ∆n RT. What is the condition under which ∆U = ∆H?
vi. Mention names and formulae of two ores of aluminium.
vii. Derive the relationship between relative lowering of vapour pressure and molar mass of
nonvolatile solute.
viii. What is pseudo first order reaction? Give one example of it.
Q. 3. Answer any THREE of the following: [9]
iii. 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 0.20 atm.
b. isothermal and reversible process.
c. into vaccum until the volume of gas is increased by 3L. (R = 8.314 J mol-1 k-1)
iv. What is the action of the following reagents on ammonia?
a. Excess of air
b. Excess of chlorine
c. Na metal
Q. 4. Answer any ONE of the following: [7]
i. a. Explain with reason sign conventions of ∆S in the following reactions :
1. N2(g) + 3H2(g) ⎯→ 2NH3(g)
2. CO2(g) ⎯→ CO2(s)
b. Explain the following terms:
1. Smelting
2. Flux
c. 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)
ii. 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.
Calculate the quantity of electricity required in coulomb.
(Molar mass of Ag is 107.9 g mol-1).
c. Define Osmosis.







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