Karnatak University 2009 P.U.C Physics, Chemistry, Maths & Biology FIRST MID-TERM - - Question Paper

Times:3 hours Subject: CHEMISTRY Marks:90
Part-A
ans the subsequent questions:-

1.Name the halide ore of magnesium.
2.Write the atomic number of the element whose outermost electrons are represented by 3s2,3p6.
3.Which is the smallest atom among halogens?
4.What is the quantity occupied by one mole of a gas at STP?
5.Give the relationship ranging from equivalent mass of a solute & normality of its solution.
6.Name the gas legal regulations which discuss the variation of quantity of the gas with temperature at constant pressure.
7.State legal regulations of conservation energy.
8.Name a drug which is used as antipyretic and analgesics.
9.Write the structural formula of a 2-chloropropanoic acid.
10.Name the catalyst used in the hydrogenation of alkenes.

Part-B
ans any TEN of the following:
11.Mention any 2 uses of ethane.
12.How is Buna-S prepared?
13.Explain functional isomerism with an example.
14.State Markownikoff's rule.
15.1 mole of an ideal gas expands isothermally and reversibly from a pressure of 4atm to 2atm at 300K. compute the maximum workdone.
16.Calculate the kinetic energy of 88gms of CO2 at 300K.
17.Define (1) Molarity (2) Equivalent mass of an element.
18.What is the affect of atomic radii and nuclear charge on ionization energy?
19.What is diagonal Relationship? Mention any 1 diagonally related pair of elements.
20.Name the various series of spectral lines obtained in the hydrogen spectrum.
21.How is an ore concentrated by forth flotation process?
22.Explain Friedel Craft's reaction.

Part-C
ans any 3 of the following:
23.a)Explain the extraction of Zinc of pyrometallurgical process.
b)Name the solvent used in the extraction of Gold. 4+1
24.a)State Pauli's principle and Hund's rule of maximum multiplicity
b)Write the significance of principal quantum number. 4+1
25.a)Give 3 difference ranging from diamond and graphite.
b)Write 2 limitations of Bohr's theory. 3+2
26.a)Calculate the wavelength of 'H'alpha line of the hydrogen spectrum.
b)How does sodium reacts with water? 3+2
27.a)Explain the terms:(1)Ionization energy (2)Electronegativity.
b)Sketch the shape of atomic orbitals whose Azimuthal quantum numbers are 0 and 1. 3+2

ans the 3 of the following:
28.a)Write any 4 postulates of Kinetic theory of gases
b)State Daltons legal regulations of partial pressure.
29.a)The enthalpies of formation of methane, carbondioxide and water are -74.8KJ,-393.5KJ.-286KJ respectively. compute the enthalpy of combustion of methane.
b)What is the value of standard enthalpy of formation of carbon?
30.a)15.8gms of cupric oxide on reduction by heating in a current of hydrogen 12.6gms of copper was found. computed the equivalent Mass of copper.
b)State Hess's legal regulations constant heat summation.
31.a)Derive the relationship ranging from V.D. and molecular mass of a gas.
b)2.835gms of an acid with molecular mass 126 was dissolved in 250cm3 of the solution. The normality of the prepared solution was 0.18N. compute the basicity of the acis.

ans any 2 of the following:
32.a)An organic compound contains 54.5% carbon,9.1% hydrogen and rest oxygen. If the molecular mass of the compound is 88. Determine its molecular formula.
b)What is meant by LDPE.
33.a)Explain the mechanism of chlorination of methane.
34.a)Explain the isolation of pure benzene from coaltar.
b)How do you convert bromoethane to ethene?

Part-D D1
ans any 1 of the following:
35.a)Describe Victor Meyer's method for determining molecular mass of a volatile substance.
b)(1) elaborate S-block elements? Write their general electronic configuration.
(2) discuss calcination and roasting.
c)How is sulphur detected in an organic compound? 4+4+2
36.a)Describe the extraction of magnesium from sea water.
b)(1)How do you convert Toluene to TNT.
(2)Write any 1 ring opening reaction of cyclopropane.
c)Calculate the number of atoms current in 24gms of carbon. 4+4+2

D2
37. define the experiment to determine the heat of solution of potassium nitrate. 5
38. define how the equivalent mass of magnesium is determined by the hydrogen displacement
method. 5
39.a)Explain chromyl chloride test. 5
b)Give a confirmatory test for NO3. 3+2

Earning:   Approval pending.