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Q.No.
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Question
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Marks
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1.
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Define electron gain enthalpy.
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1
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2.
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Write I.U.P.A.C. name of the following compound:
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1
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3.
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Define standad enthalpy of formation.
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1
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4.
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Write electronic configuration of $mathrm{Cu}^{2+}$ ion. (Atomic number of $mathrm{Cu}=29$ ).
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1
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5.
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In which orbital will the electrons enter first 3 d or 4p ?
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1
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6.
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Give the units of vander waal’s constants. Also point out their significance.
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2
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7.
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$0.3780 mathrm{~g}$ of an organic chloro compound gave $0.5740 mathrm{~
g}$ of silver chloride in carius estimation. Calculate the percentage of chlorine present in compound.
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2
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8.
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Write the short notes on:
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2
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(a)
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Wurtz Reaction
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(b)
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Freidal Craft’s Alkylation
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9.
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Write the molecular shapes of:
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2
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(a)
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$mathrm{XeF}_{4}$
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(b)
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$mathrm{CIF}_{3}$
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10.
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Determine the emperical formula of an oxide of iron which has $69.9 %$ iron and $30.1 %$ dioxygen by man. $quad$ [Atomic mass: $mathrm{Fe}=55.85, mathrm{O}=16.00]$
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2
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11.
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The ionization enthalpy of lithium is $520 mathrm{kJmol}^{-1}$, calculate the amount of energy required to convert $140 mathrm{mg}$ of lithium atoms in gaseous state into $mathrm{Li}^{+}$ ion.
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2
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12.
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How does Heisenberg’s uncertanity principle support concept of orbital?
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2
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13.
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Compelete the following reactions:
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3
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(a)
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(b)
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(c)
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14.
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Balance the following reaction in acidic medium:
$mathrm{MnO}_{4}^{-}(mathrm{aq})+mathrm{SO}_{2}(mathrm{~g}) longrightarrow mathrm{Mn}^{2+}(mathrm{aq})+mathrm{HSO}_{4}^{-}(mathrm{aq})$
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3
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15.
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The value of $mathrm{K}_{mathrm{C}}$ for the reaction:
$2 mathrm{~A} rightleftharpoons mathrm{B}+mathrm{C}$ is $2 times 10^{-3}$ at $500 mathrm{~K}$. At given time, the composition of reaction mixture is $[mathrm{A}]=[mathrm{B}]=[mathrm{C}]=3 times 10^{-4} mathrm{M}$. Is the reaction mixture at equilibrium? If not, what is the direction of net reaction?
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3
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16.
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Write down the nature of below reaction with reason:
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3
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(a)
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$mathrm{NH}_{3}+mathrm{H}^{+} rightarrow mathrm{NH}_{4}^{+}$
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(b)
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$mathrm{BF}_{3}+mathrm{NH}_{3} rightarrow mathrm{F}_{3} mathrm{~B} leftarrow mathrm{NH}_{3}$
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(c)
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$mathrm{H}_{2} mathrm{SO}_{4} rightarrow mathrm{H}^{+}+mathrm{HSO}_{4}^{-}$
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17.
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Arrange the following carbocation in creasing order of their stability. $left(mathrm{CH}_{3}right)_{2} mathrm{CH}^{+}, mathrm{CH}_{3} mathrm{CH}_{2}^{+},left(mathrm{CH}_{3}right)_{3} mathrm{C}^{+}, mathrm{CH}_{3}^{+}$
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3
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18.
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How will you convert
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3
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(a)
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Propan-1-ol into propene
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(b)
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2-bromopropane into But-2-ene
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(c)
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Ethyl amine into ethyl isocyanide
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19.
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3
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(a)
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Define eutrophication and penumocanosis.
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(b)
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Write difference in between photochemical and classical smog.
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20.
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3
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(a)
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Calculate the oxidation number of $mathrm{S}$ in $mathrm{S}_{2} mathrm{O}_{6}^{-2}$ having $(-mathrm{O}-mathrm{O}-)^{2-}$ linkage and $mathrm{C}$ in $mathrm{CH}_{3} mathrm{COOH}$.
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(b)
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Balance the equation in basic medium by half reaction method
$$
mathbf{P}_{4}(s) rightarrow P H_{3}(g)+H_{2} P O_{2}^{-}(A q)
$$
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21.
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3
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(a)
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Out of staggerd and eclipsed conformations of n-butane, which is more stable and why?
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(b)
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What causes the temporary and permanent hardness of water.
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22.
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Write a breif note on the following environmental terms:
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3
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(a)
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Acid rains
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(b)
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Eutrophication/Green House effect
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(c)
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Green chemistry
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23.
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3
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(a)
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Define buffer solution.
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(b)
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The solubility of $mathrm{Sr}(mathrm{OH})_{2}$ at $298 mathrm{~K}$ is $19.23 mathrm{~g} / mathrm{L}$ of solution. Calculate the concentration of strontium and hydroxyl ions and the $mathrm{pH}$ of the solution.
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24.
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Write any three main biological importance of $mathrm{Ca}$ and $mathrm{Mg}$.
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3
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25.
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5
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(a)
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The stability of peroxide and superoxide of alkali metals increases as we go down the group. Explain giving reasons.
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(b)
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How to control photochemical smog.
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OR
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(a)
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Derive first law of thermodynamics.
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(b)
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Define enthalpy of neutralisation.
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(c)
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Calculate the $Delta mathrm{H}^{theta}$ of the reaction.
Bone enthalpies of $mathrm{C}-mathrm{H} & mathrm{C}-mathrm{Cl}$ bond are $415 mathrm{~kJ} mathrm{~mol}^{-1} & 326 mathrm{~kJ} mathrm{~mol}^{-1}$
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26.
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5
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(a)
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Account for the following:
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i.
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Boron Halides do not dimerise like $mathrm{BH}_{3}$.
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ii.
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Carbon shows catenation
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iii.
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$mathrm{PbCl}_{4}$ is a good oxidising agent.
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(b)
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Complete the following reactions:
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i.
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$mathrm{B}_{2} mathrm{H}_{6}+3 mathrm{O}_{2} longrightarrow$
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ii.
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$2 mathrm{BF}_{3}+6 mathrm{NaH} stackrel{450 mathrm{~K}}{longrightarrow}$
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OR
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(a)
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Write equation to justify amphoteric nature of Water.
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(b)
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What is application of equilibrium constant.
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(c)
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What are the full form of BOD?
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27.
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5
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(a)
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Is the entropy of the universe constant?
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(b)
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If standard free energy change for a reaction is found to be zero, what is its equilibrium constant.
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(c)
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Define common ion effect.
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OR
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(a)
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Calculate the degree of ionisation of $0.1 mathrm{~mol} / mathrm{L}$ solution of acetic acid, given $mathrm{K}_{mathrm{a}}$ for $mathrm{CH}_{3} mathrm{COOH} 1.8 times 10^{-5} mathrm{~mol} / mathrm{L}$
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(b)
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Define the following terms :
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i.
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Solubility product
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ii.
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Buffer solution
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iii.
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Henderson equation
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