PAPER CODE 2481
(11 CLASS - 2015)
CHEMISTRY
(GROUP FIRST)
TIME: 20 MINUTE: 
OLD COURSE (ACADEMIC SESSION : 2011 - 2013)
Marks: 17
OBJECTIVE
NOTE: You have four choices for each objective type question as .A , B , C and D . The choice which you think is correct, fill that circle in front of that question number. Use marker or pen to fill the circles. Cutting or filling two or more circles will result in zero mark in that question.

Question#1

• The largest no. of molecules are present in
  
  (A) 3.6 g of H₂0
  (B) 4.81 of C₂H₅OH
  (C) 2.8 g of CO
  (D) 5.4 g of N₂O₅
  
  
• The volume occupied by 1.4 g of N₂ of S.T.P is
  
  (A) 2.24dm³
  (B) 22.4dm³
  (C) 1,12 dm³
  (D) 112 Cm³
  
  
• The molar volume of CO₂ is maximum at ,
  
  (A) S.T.P
  (B) 127 °C and 1 atm
  (C) 0 °C and 2 atm
  (D) 273 °C and 2 atm
  
  
• A real gas obeying Vander Waal’s equation will resemble ideal gas if
  
  (A) Both' a' and " b " are large
  (B) Both a ' and b ' are small
  (C) ' a' is small ' b' is large
  (D) a is large and b ' is small
  
  
• The molecular of CO₂ in dry ice form the
  
  (A) Ionic crystals
  (B) Covalan crystals
  (C)Molecular crystals
  (D) Any type of crystal
  
  
• Which of the following is a pseudo solid.
  
  (A) CaF₂
  (B) Glass
  (C) NaCI
  (D) Na₂B₄O₇
  
  
• Quantum number Values for 6d orbital are
  
  (A) n=6 1=2
  (B) n = 5 1=2
  (C) n = 6 1=3
  (D) n = 6 I = 1
  
  
• Orbital’s having same energy are called
  
  (A) Hybrid orbitals
  (B) Valence orbitals
  (C) d - orbitals
  (D) degenerate orbitals
  
  
• Which of the following molecules have zero dipole moment
  
  (A) NH₃
  (B) CHCI₃
  (C) H₂O
  (D) BF₃
  
  
• Which of the following species has unpaired electrons in anti bonding molecular orbitals
  
  (A) O₂⁺²
  (B) N₂ ^-2
  (C) B₂
  (D) F₂
  
  
• 18 g of glucose is dissolved in 90 g of water the relative lowering of vapour pressure is equal to
  
  (A) 1/51
  (B) 1/5
  (C) 5.1
  (D) 6
  
  
• The molar boiling point constant is the ratio of the elevation in boiling point to
  
  (A) Mole fraction of solute
  (B) Mole fraction of solvent
  (C) Molarity
  (D) Molality
  
  
• The comparative rates at which the solutes moves in paper chromatography depends on
  
  (A) Size of paper
  (B) Temperature of the experiment
  (C) Size of the chromatographic tank
  (D) Rf values of solutes
  
  
• For a given process , the heat changes at constant pressure (qp) and at constant volume (qv) are related to each other as
  
  (A) q_p =q_v
  (B) q_p < q_v
  (C) q_p > q_v 
  (D) q_p =q_v/2
  
  
• The solubility product of AgC1 is 2,0x10 mole dm^-6 . The maximum concentration of Ag⁺¹ ions in the solution is
  
  (A) 2.0x10^-10 mol dm³
  (B) 1.41x10^-5 mol dm³
  (C) 1.0x10^-10 mol dm³
  (D) 4.0x10^-20 mol dm³
  
  
• If a strip of Cu. metal is placed in a solution of FeSO₄
  
  (A) Cu-will be deposited
  (B) No reaction takes place
  (C) Cu and Fe both dissolve
  (D) Fe is precipitated
  
  
• The unit of rate constant is the same as that of rate of reaction in
  
  (A) Zero order reaction
  (B) Second order reaction
  (C) First order reaction
  (D) Third order reaction

CITEMISTRY
(ACADEMIC SESSION: 2011 - 2013)
(11^th CLASS 2015)
TIME :2.40 HOURS
OLD COURSE) GROUP FIRST
MARKS :68
SUBJECTIVE
SECTION-I
2. Write short answers any Eight (8) questions of the following 16

• Why N₂ and CO have same number of electrons , protons and neutrons
• Why two moles of NaOH are required for complete neutralization of one mole of H₂SO₄
• What are characteristics of ideal solvent used for crystallization
• What are uses of chromatography ?
• State Avogadro's law
• What is Joule Thomson effect
• Why real gases show non ideal behaviour at low temperature and high pressure
• Differentiate between effusion and diffusion
• Why water boils at low temperature at mountains
• Define: (a) Dipole - dipole forces (b) Hydrogen bonding
• Why diamond is hard and electrically neutral
• Ionic solids do not conduct electricity in solid state

3.Write short answers any Eight (8) questions of the following 16

•  Give any two properties of cathode rays
• State two defects in Rutherford's atomic model
• Draw the shapes of d-orbitals
• Why is the second ionization energy greater than first one?
• Define bond energy and give one example
• Rate of reaction den ionic compound is faster than covalent compound. Why?
• Define exothermic reaction and give one example
• Is it we that a non-spontaneous process never happens in the universe ? Explain it
• Why it is necessary to mention the physical states of reactants and products in a thermochemical reaction
• The solubility of glucose in water is increased by increasing temperature. Why ?
• Define solubility product
• What is meant by conjugate acid and conjugate base?

4.Write short answers any Six (6) questions of the following 12

• Define with brief explanation percentage weight volume solution
• Write a note on hoer conversion of various concentration units of solutions
• Differentiate between hydration and hydrolysis
• Why relative lowering of vapour pressure is independent of temperature ?
• Write down any four rules for balancing of rock equations by Ion-Electron method
• Define electrode potential. Give one example
• Write down two characteristics of a catalyst
• Differentiate between negative catalysis and autmatalysis
• Write down four characteristics of Enzyme Catalysis

SECTION-II
Note : Attempt any three questions from this section (8*3=24)

Question#5
(a) Define: limiting reactant , how limiting reactant can be determind. Explain it with an example
(b) Write a note on buffer capacity

Question#6
(a) Define: solubility and solubility curves and discuss continuous solubility curves
(b) Working at a vacuum line a chemist Isolated a gas in a weighing bulb with a volume of 255 Cm³ , at a temperature of 25 ^°C and under a pressure in the bulb of 10.0 tort, the gas weighed 12.1 mg.What is the molecular mass of this gas?

Question#7
(a) Explain the following properties of crystalline solids. Give two examples in each case
(i) Anisotropy  
(ii) Polymorphism
(b)10.16 g of graphite is burnt in a bomb calorimeter and the temperature rise recorded is 3.87 K.Calculate the enthalpy of combustion of graphite, if the heat capacity of the calorimeter (bomb, water etc) is 86.02 KJK^-1

Question#8
(a) Describe en experiment to measure charge to mass (e/m) ratio of electron
(b) A study of rote of reaction for various initial concentrations of reactants A and B is tabulated below. 
Calculate the rate law for the reaction A + B →product
INITIAL CONCENTRATIONS RATE

Question#9
(a) What is ionic bond ? Explain with two examples
(b) What is an electrochemical series, give two applications