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MODEL PAPER 10 Chemistry - MODEL PAPER 10

Bihar Board (BSEB) - STD 12 Science - Chemistry (BSEB - English Medium). 37 questions in this chapter.

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MODEL PAPER 10 question types

37 questions across 6 question groups — pick any mix to generate a Chemistry paper with step-by-step answer keys.

37
Questions
6
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5
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Sample Questions

MODEL PAPER 10 questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q [1M]1 Mark
Which of the following reactions of glucose can be explained only by its cyclic structure?
  • A
    Glucose is oxidised by nitric acid to gluconic acid.
  • ✓
    Pentaacetate of glucose does not react with hydroxylamine
  • C
    Glucose reacts with hydroxylamine to form an oxime.
  • D
    Glucose forms pentaacetate.

Answer: B.

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Q 2M.C.Q [1M]1 Mark
Aniline does not undergo Friedel - Crafts reaction because:
  • A
    Anilium ion deactivates any further reaction
  • ✓
    Aluminium chloride reacts with Aniline
  • C
    All of these
  • D
    AlCl3 act as a catalyst

Answer: B.

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Q 4M.C.Q [1M]1 Mark
The reduction of ethanenitrile with sodium and alcohol gives:
  • ✓
    1-aminoethane
  • B
    Ethanamide
  • C
    1-aminopropane
  • D
    Ethanoic acid

Answer: A.

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Q 6Assertion (A) & Reason (B) MCQ [1M]1 Mark
Assertion (A): Aldehydes and ketones show condensation reactions.
Reason (R): The hydrogen atoms attached to $\alpha$-carbon of aldehydes and ketones are reactive.
  • ✓
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • D
    A is false but R is true.

Answer: A.

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Q 7Assertion (A) & Reason (B) MCQ [1M]1 Mark
Assertion (A): Ammonolysis of alkyl halides is not a suitable method for the preparation of pure primary amines.
Reason (R): Ammonolysis of alkyl halides yields mainly secondary amines.
  • A
    Both Assertion (A) and Reason (R) are true and Reason (R) is not the correct
  • B
    Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
  • ✓
    Assertion (A) is true, but Reason (R) is false
  • D
    Assertion (A) is false, but Reason (R) is true.

Answer: C.

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Q 8Assertion (A) & Reason (B) MCQ [1M]1 Mark
Assertion (A): Cellulose can be easily converted into fibres.
Reason (R): Cotton contains about 90% cellulose.
  • A
    Both A and R are true and R is the correct explanation of A.
  • ✓
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • D
    A is false but R is true.

Answer: B.

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Q 9Assertion (A) & Reason (B) MCQ [1M]1 Mark
Assertion (A): Dehydration of glycerol with KHSO4 gives acrolein.
Reason (R): Acrolein is an α, β-unsaturated aldehyde.
  • A
    Both A and R are true and R is the correct explanation of A.
  • ✓
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • D
    A is false but R is true.

Answer: B.

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Q 153 Marks Question3 Marks
Zinc rod is dipped in 0.1 M solution of $ZnSO _4$
The salt is $95 \%$ dissociated at is dilution at 298 K . Calculate the electrode potential. Given
$E ^0\left( Zn ^{2+} / Zn \right)=-0.76$
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Q 163 Marks Question3 Marks
Give structures of the products you would except when each of the following alcohols
i. Butan-1-ol
ii. 2-Methylbutan-2-ol react with
a. HCI - ZnCl2
b. HBr and
c. SOCI2
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Q 183 Marks Question3 Marks
The following results have been obtained during the kinetic studies of the reaction.
2A + BC → D
Experiment[A]/mol L-1[B]/mol L-1Initial rate of formation of D/mol L-1 min-1
I0.10.16.0 x 10-3
II0.30.27.2 x 10-2
III0.30.42.88 × 10-1
IV0.40.12.40 x 10-2

Determine the rate law and the rate constant for the reaction.
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Q 193 Marks Question3 Marks
Calculate the emf of the following cell at 298 K .
$
2 Cr(s)+3 Fe^{2+}(0.1 M) \rightarrow 2 Cr^{3+}(0.01 M)+3 Fe(s)
$
Given, $E_{c r^{3+} / c r}^o=-0.74 V, E_{F e^{2+} / F e}^o=-0.44 V$
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Q 20Long Answer Type Questions [5M]5 Marks
Attempt any five of the following:
(a) Which sugar is present in milk?
(b) Why must vitamin C be supplied regularly in diet?
(c) What type of substance is phenylanine hydroxylate? Write its importance.
(d) Define denaturation of protein. What is the effect of denaturation on the structure of protein?
(e) Name the linkage connecting monosaccharide units in polysaccharides.
(f) How do you explain the presence of all six carbon atoms in glucose in a straight chain?
(g) Write the reactions showing the presence of following in the open structure of glucose:
i. a carbonyl group
ii. chain with six carbon atoms
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Q 21Long Answer Type Questions [5M]5 Marks
FeSO4 solution mixed with $\left( NH _4\right)_2 SO _4$ solution in 1:1 molar ratio gives the test of $Fe ^{2+}$ ion but $CuSO _4$ solution mixed with aqueous ammonia in $1: 4$ molar ratio does not give the test of $Cu ^{2+}$ ion. Explain why?
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Q 24Long Answer Type Questions [5M]5 Marks
a. Amongst the following, the most stable complex is:
i. $\left[ Fe \left( H _2 O \right)_6\right]^{3+}$
ii. $\left[ Fe \left( NH _3\right)_6\right]^{3+}$
iii. $\left[ Fe \left( C _2 O _4\right)_3\right]^{3-}$
iv. $\left[ FeCl _6\right]^{3+}$
b. What will be the correct order for the wavelength of absorption in the visible region for the following:
$
\left[Ni\left(NO_2\right)_6\right]^{4-},\left[Ni\left(NH_3\right)_6\right]^{2+},\left[Ni\left(H_2 O\right)_6\right]^{2+}
$
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Q 254 Marks Questions4 Marks
The unique behaviour of Cu , having a positive $E ^{\circ}$ accounts for its inability to liberate $H _2$ from acids. Only oxidising acids (nitric and hot concentrated sulphuric) react with Cu , the acids being reduced. The stability of the half-filled d sub-shell in $Mn ^{2+}$ and the completely filled $d ^{10}$ configuration in $Zn ^{2+}$ are related to their $E ^{\circ}$ values, whereas $E ^{\circ}$ for Ni is related to the highest negative $\Delta_{h y d} H ^{\circ}$. An examination of the $E_{\left(M^{3+} / M^{2+}\right)}^o$ values the low value for Sc reflects the stability of $Sc ^{3+}$ which has a noble gas configuration. The comparatively high value for Mn shows that $Mn ^{2+}\left( d ^5\right)$ is particularly stable, whereas a comparatively low value for Fe shows the extra stability of $Fe ^{3+}\left( d ^5\right)$. The comparatively low value for V is related to the stability of $V ^{2+}$ (half-filled $t _{2 g}$ level).
Image
i. Why Zn has high value for $M ^{3+} / M ^{2+}$ Standard Electrode Potentials?
ii. Transition metals, despite high $E^{\circ}$ oxidation, are poor reducing agents. Justify.
iii. Why is $Cr ^{2+}$ reducing and $Mn ^{3+}$ oxidising when both Cr and Mn have $d ^4$ configuration?
OR
iii. Why Cu<sup>2+</sup> is more stable than Cu<sup>+</sup>?
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Q 264 Marks Questions4 Marks
Vapour pressure of a liquid or a solution is the pressure exerted by the vapour in equilibrium with the liquid or solution at a particular temperature. It depends upon the nature of the liquid and temperature. The non-volatile solute in solution reduces the escaping tendency of the solvent molecules in the vapour phase because some of the solute particles occupy the positions of the solvent molecules on the liquid surface. The relative lowering of the vapour pressure of a solution containing a non-volatile solute is equal to the mole fraction of the solute in the solution. This is also known as Raoult's law. However, for solutions of volatile solutes, the vapour pressure of a component in a solution at a given temperature is equal to the mole fraction of that component in the solution multiplied by the vapour pressure of that pure component. The solutions in which each component obeys Raoult's law is called an ideal solution. For ideal solutions $\Delta H_{\text {mixing }}$ and $\Delta V_{\text {mixing }}$ are also zero. Practically no solution is ideal. A non-ideal solution is that solution in which solute and solvent molecules interact with one another with a different force than the forces of interaction between the molecules of the pure components. There are two types of non-ideal solutions, showing positive deviations and negative deviations from ideal behaviour. If for the two components A and B , the forces of interaction between A and B molecules are less than the A-A and B-B interactions, the non-ideal solutions have positive deviations. On the other hand, if the forces of interaction between A and B molecules are more than the A-A and B-B interactions, the non-ideal solutions have negative deviations.
i. What is the mole fraction of A in solution obeying result's low if the vapour pressure of a pure liquid A is 40 mm of Hg at 300 K . The vapour pressure of this liquid in solution with liquid B is 32 mm of Hg ?
ii. Vapour pressure of a solution of heptane \& octane is given by the equation: (1) $P ( sol ).( mm Hg )=35+65 x$, where x is the mole fraction of heptane. Calculate the vapour pressure of pure octane.
iii. What is the value of $\Delta V _{\text {mixing }}$ and $\Delta H _{\text {mixing }}$ for non-ideal solution showing negative deviation?
OR
iii. Acetic acid + pyridine, the mixture is an example of which type of solution?
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