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Posted By: palaniappan Member Level: Silver Posted Date: 11 May 2008
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2000 CBSE CHEMISTRY Question paper
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Chemistry Class- XII 1996 (CBSE)
Q1) Write the state of hybridisation of Boron in BCI3. (Marks 1)
Q2) What are the coordination number of each of the ions present in the cubic close packed structure of CaF2 at ordinary temperature and pressure? (Marks 1)
Q3) The rate constant of a reaction is 2 x 10-2 L mol-1 s-1. What is the order of the reaction? (Marks1)
Q4) Give the IUPAC name of the following compound: (Marks 1)
O
CH3
CH
C
CH
OCH2CH3
CH3 CH3
Q5) Which alkali metal carbonate decomposes on heating to liberate CO2? (Marks 1)
Q6) Name the first element of the 3-d transition metal series. (Marks 1)
Q7) Give the IUPAC name of the linkage isomer of [ (NH3)3 Pt-NO2 ] Cl. (Marks 1)
Q8) Fill in the blanks:
Alpha rays are fast moving ... nuclei. (Marks 1)
Q9) Fill in the blanks:
The scattering of light by colloidal dispersion is called ... (Marks 1)
Q10) If a fragment of one strand of DNA has the base sequence TACGGACAT, what is the base sequence of the complementary strand? (Marks 1)
Q11) A solid AB has the NaCl structure. If a radius of the cation A+ is 120 pm, calculate the maximum possible value of the radius of the anion B-. (Marks 2)
Q12) The enthalpy change for the reaction
Ag2O(s) 2Ag(s) + ½ O2(g)
is 30.54 kJ mol-1 and S = 0.06 kJ K1 mol-1 (at 1 atm). Calculate the temperature at which G is equal to zero. Also predict the direction of the reaction at a temperature below this calculated temperature. (Marks 2)
Q13 What is standard hydrogen electrode? Give the reaction that occurs at this electrode when it acts as positive electrode in an electrode in an electrochemical cell. (Marks 2)
Q14 Calculate the E.M.F. of the following cell at 298 K : (Marks 2)
Mg | Mg2+ (0.1 M) || Ag+ (0.1M) | Ag
Given:
E°Mg2+ / Mg = -2.37 V, E°Ag+/Ag = 0.8 V,
R=8.31 JK-1 mol-1, F= 96500 C mol-1
Q15 With the help of chemical reaction show how you convert 2-propanol to 1-bromopropane in two steps? (Marks 2)
Q16) Give a chemical test to distinguish between ethanol and propanol. Write the balance chemical equation. (Marks 2)
Q17) Predict the product of the following reaction and balance the equation: (Marks 2)
heat
(a) C6H5OCH3 + HBr
(cont.)
NaOH(dil.)
(b) CH3CHO
as catalyst
Q18) What is Sandmeryer's reaction? Illustrate with a suitable example. (Marks 2)
Q19) What are interstitial compounds? Explain them with reference to transition metals and mention their two important properties. (Marks 2)
Q20) Using valence bond approach, predict the shape and the magnetism (i.e. paramagnetic or dia-magnetic) of [Co(CO)4]-. (Atomic number of Co=27). (Marks 2)
Q21) What is the principal of radiocarbon dating? Write one probable source of error in determining the age of very old pre historic fossils. (Marks 2)
Q22) What are elastomers? Give the chemical equation for the preparation of Buna-S. (Marks 2)
Q23) Explain why lyophilic sols are relatively more stable then lyophobic sols. (Marks 2)
Q24) Write and explain the general structure of triglycerides. (Marks 2)
Q25) What is glycolysis? Explain. (Marks 2)
Q26) Define the following: (Marks 2)
(a) Disperse Dyes.
(b) Antipyretics.
Q27) Calculate the wavelength of the photon which excites the electron of hydrogen atom from first shell to fourth shell. Ionisation energy of hydrogen atom is 1.312 x 10 3 kJ mol-1.
Given:
Planck's constant, h = 6.6 x 1034 kg m2s-1
Velocity of light, c = 3 x 108 ms-1
Avogadro's number, NA = 6 x 1023 mol-1 (Marks 3)
Q28) Calculate the equilibrium constant for the following reaction at 298 K and 1 atmosphere pressure :
CO (g) + 3H2(g) CH4(g) + H2O(l)
Given:
Hf° at 298 K for : CO(g) = -110.5 kJ mol-1
CH4(g) = - 74.8kJ mol-1
H2O (l) = -286.0 kJ mol-1
S° for the reaction at 298 K
= -333.3 JK-1 mol-1 Gas constant, R=8.31JK-1 mol-1. (Marks 3)
Q29) The following rate data were obtained at 300 K for the reaction 2A + B C + D :
Experiment
No. [A]
mol L-1 [B]
mole L-1 Rate of formation
of D mol L-1 min-1
1
2
3
4 0.1
0.3
0.3
0.4 0.1
0.2
0.4
0.1 6.0 x 10-3
7.2 x 10-2
2.88 x 10-1
2.4 x 10 -2
Calculate the rate of formation of D when [A] = 0.5 mol L-1 and [B] = 0.2 mol L-1. (Marks 3)
Q30) Write the resonance structure of phenol (which is similar to that of chlorobenzene) and explain why phenol is more acidic than ethanol. Explain whether p-nitrophenol should be more or less acidic than phenol. (Marks 3)
Q31) Write the structure of the reagent/organic compound A to F in the following Sequence of
reactions: (Marks 3)
HNO3
(conc.) Sn/HCl CHCl3/
KOH H2/Pt
(A)
(B)
(C)
(D)
(E)
H2SO4
(conc.) heat
heat heat
(F)
Q32) Explain why transition metals form:
(a) alloys with other transition metals easily.
(b) compound in different oxidation states. (Marks 3)
Q33) Explain the difference between osmotic pressure and vapour pressure of a solution. (Marks 5)
Q34) Give any three points of similarities between boron and silicon, and two points of dissimilarities between boron and aluminum. (Marks 5)
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