CLASS: XII
SUBJECT: CHEMISTRY
MM:70
SECTION A
Q.1 Multiple Choice Question
10
1. Unit of first order rate constant_______
a) Sec-1
b) mol/lit/sec
c) mol/dm3/sec
d) min-1
2. Number of atoms in body centred cubic crystal___
a) 1
b) 2
c) 3
d)4
3. Oxidation state of cobalt ion in [Co(NH3)5Br]SO4
a) +2
b)+3
c)+4
d)+1
4. Colligative property of solution_____
a)Vapour pressure
b) Boiling point
c) Osmotic Pressure d)Melting Point
+
-6
5. What is the pH of the solution if the [H ] is 2.3×10 ?
a) 5.638
b) 2.3
c) 23
d) 10-6
6. The type of isopropylamine is a_____
a) Primary amine
b)Secondary amine c) Tertiory amine
d) Quaternary amine
7. Glucose on oxidation with dilute nitric acid gives___
a) Saccharic acid
b)Oxalic acid
c) Gluconic acid
d) Malonic acid
8. Which of the following is the product of reaction of ethane nitrile with grignard reagent followed by
acid hydrolysis?
a) A ketone
b) An aldehyde
c) An acid
d) An acid chloride
9. Oxidation of ethyl alcohol using K2Cr2O7/dil.H2SO4 leads to formation of ___
a) Acetaldehyde
b)Acetic acid
c) Ethane
d) Acetone
-5
10. The pKb of weak base BOH (kb of BOH is 1×10 ) will be
a) -5
b) 5
c) 1
d) 10-5
Q.2 Very Short Answer
8
1.
2.
3.
4.
5.
Define Order of reaction.
What is Shottky defect?
State Roult law for non volatile solute.
Explain Work done in vaccume or space is zero.
Draw the structure of α-D-Glucopyranose.
6.
Calculate the EAN of [Co(NH3)6]3+
7. Give the reaction for the preparation of Nylon-6.
8. What are the acids according to Arrhenius theory?
SECTION B (Solve Any Eight 2 Marks Each)
Q.3 Give the difference between order of reaction and molecularity.
Q.4 Calculate the standard emf (Eocell) of cell. 3Ni + 2Al3+
16
2
3Ni+2 + 2Al
if EoNi= -0.25V and EoAl= -1.66V
2
Q.5 Explain Hofmann Bromide Degradation.
2
Q.6 Calculate the magnetic moment of element having two unpaired electrons.
2
Q.7 Explain interhalogen compounds.
2
Q.8 Give the difference between Lanthanoid and Actinoid.
2
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Q.9 Draw the coordination complex of the a) Hexacyanoferrate(II) ion b) Sodium Hexaflouroaluminate(III) 2
Q.10 Explain Rosenmund Reduction.
2
Q.11 Explain How will you convert Benzene into Benzaldehyde?
2
Q.12 What is the action sodium metal on n-propyl bromide?
2
Q.13 Calculate the half life of first order reaction if the rate constant is 0.035min.
2
Q.14 How will you connvert methyl alcohol into methyl chloride?
2
SECTION C (Solve Any Eight 3 Marks Each)
24
Q.15 Explain packing efficienncy in Body Centered Cubic (BCC).
Q.16 What is Elevation in boiling point and how can determine the molecular weight of solute by elevation in
boiling point?
Q.17 What is the action of following on Ethyl bromide? a)Mg metal b) Alcoholic KOH
c) Aq. KOH
Q.18 Explain the following properties of group 16 elements a)Atomic radii b) Ionization enthalpy c)
Electronegativity
Q.19 According to VBT explain the geometry of [Co(NH3)6]3+
Q.20 Explain a)Metal excess defect b) Frankel Defect
Q.21 Explain the preparation of a)Nylon 6,6 b) Terylene
Q.22 Explain principle,construction, working and electrode representation of Standard Hydrogen Electrode.
Q.23 Explain Gabriel Pthalimide Synthesis.
Q.24 In NaOH solution [OH-]=2.87×10-4.Calculate the pH of the solution.
Q.25 Derive the expression for maximum work.
Q.26 When gold crystallizes,it forms FCC cells.The unit cell edge length is 408pm.Calculate the density of
gold.Molar mass of gold is 197 g/mol.
SECTION D(Solve Any Three 4 Marks Each)
Q.27 a) Define Coordination number.
12
4
b)Give the reaction for the preparation Salicylic acid.
c)Derive an expression for the relation between half life and rate constant for first order reaction.
Q.28 Explain Aldol condensation reaction with mechanism.
4
Q.29 Convert the following a) cumene to phenol b) Phenol to Salicylaldehyde
Q.30 a) State Vant Haff Boyles law.
4
b)Derive an integrated rate equation for first order reaction.
Q.31 a)What is Isothermal process?
4
b) Define Cryoscopic constant.
c) The molar conductivity of 0.05M BaCl2 solution at 25oC is 223 ohm-1cm2mol-1.
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