BAKLIWAL TUTORIALS

C25 BTEST-11 CHEMISTRY

SINGLE OPTION CORRECT

Q.1 Keto-enol tautomerism does not observe in:

(A) (B)

(C) (D)

Solution: (A)

Q.2 The hydrolysis of dimethyl dichloro silane followed by polymerization gives

(A) Silicones (B) Silicates (C) SiO2 (D) Silicic acid

Solution: (A)

Q.3 List-I contains some chemical reaction and List-II contains information about xenon containing
chemical species formed. Choose the correct match.

List-I List-II

(P) XeF2 + H2 O ⟶ (1) Cation has bent 𝑇 shape

(Q) XeF4 + SbF5 ⟶ (2) Oxidation state is zero
(R) 2XeF6 + 3SiO2 ⟶ (3) Anion formed undergoes disproportionation in basic medium
(S) XeO3 + OH − ⟶ (4) Hybridization of Xe is 𝑠𝑝3

(A) P → (2), Q → (1), R → (3), S → (4) (B) P → (4), Q → (3), R → (2), S → (1)
(C) P → (2), Q → (1), R → (4), S → (3) (D) P → (1), Q → (2), R → (3), S → (4)

Solution: (C)

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The correct stability order among these canonical structures is

(A) I > II > III (B) II > I > III
(C) I > III > II (D) III > I > II

Solution: (C)
Stability order of negative charge O⊖ > N⊖ > C ⊖

MULTIPLE OPTION CORRECT

Q.5 In rate law for the reaction

2H2 (g) + 2NO(g) ⟶ N2 (g) + 2H2 O(g)

is rate = k[H2 ][NO]2 which of the following mechanisms can be expressed by this rate law.

(A) 2NO ⇌ N2 O2 (fast equilibrium)

N2 O2 + H2 ⟶ N2 O + H2 O (Slow)
N2 O + H2 ⟶ N2 + H2 O (Fast)

1
H2 + NO ⟶ H2 O + 2 N2 (Slow)
1 1
(B) N2 + NO ⟶ N2 + 2 O2 (fast)
2
1
O2 + H2 ⟶ H2 O (fast)
2

H2 + 2NO ⟶ N2 O + H2 O (Slow)
(C)
N2 O + H2 ⟶ N2 + H2 O (fast)

H2 + 2NO ⇌ H2 O + N2 O (fast)
(D)
N2 O + H2 ⟶ N2 + H2 O (slow)

Solution: (AC)

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Q.6 Which of the following statement(s) regarding the reaction given below is/are correct?

Ca 2 B6 O11 + Na 2 CO3 ⎯⎯ → CaCO3 + ( A ) + ( B )
( A ) + CO2 → ( B )
(A) Compound (B) contains 5 B-O-B linkages
(B) Compound (A) is obtained on thermal decomposition of compound (B)
(C) Aqueous solution (B) is used as an acidic buffer
(D) In compound B, two boron atoms have four B—O bonds whereas the other two have three B—O
bonds.

Solution: (ABCD)

Q.7 In which of the following all the atoms are in sp3 hybridisation?
(A) Carborundum (B) Fullerene (C) Diamond (D) Quartz

Solution: (ACD)
Carborundum (SiC), Diamond and Quartz are the substances in which each one has all the atoms in
𝑠𝑝3 hybridisation. Fullerene on the other hand has all the C-atoms in 𝑠𝑝2 hybridisation.

Q.8 Which of the following statements is/are true for hydrophilic sols?
(A) They usually do not require stabilizer and emulsifier for stability
(B) large amount of electrolyte is required for coagulation
(C) They are reversible in nature
(D) The greater extent of Tyndall effect is observed

Solution: (ABC)

Factual

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Q.9 Which of the following is/are correct order of basic strength?

(A) ( CH3 )3 C−  ( CH3 )2 CH−  ( CH3 )2 N−  CH3 NH−  CH3O−

Solution: (ABC)

Q.10 Taking the reaction, A + 2 B ⟶ Products, to be of second order, which of the following may be the
correct rate law expression(s)?
dx dx
(A) = k[A]2 (B) dt = k[A][B]2
dt
dx dx
(C) dt = k[A][B] (D) = k1 [ A] + k 2 [ B]2
dt

Solution: (AC)

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Q.11 Which of the following reactions is/are feasible:

Solution: (ACD)

Q.12 Following are the curves for nucleophilic substitution reaction?

The correct statement (s) is/(are)

(A) 'I' is potential energy diagram for SN 2 reaction that takes place with a negative potential energy

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change.
(B) 'Il' is potential energy diagram for 𝑆𝑁 2 reaction with a positive potential energy change.
(C) 'III' shows potential energy diagram for SN 1 reaction with large energy of activation for first
step.
(D) 'Ill' shows potential energy diagram for 𝑆𝑁 1 reaction and first step is RDS for forward reaction.

Solution: (ABCD)

NUMERICAL TYPE

Q.13 The number of isomers possible for disubstituted borazine, B3 N3 H4 X2 is

Solution: (4)

Q.14 How many given carbocation can show rearrangement to get stability?

Solution: (5)

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Q.15 How many of the following statements are incorrect?

(1) 2-D sheet-silicates has (Si2 O5 )2n−
n repeating unit in their structures
(2) Mg 2 [(SiO3 )2 ] is a pyro silicate
(3) BaTi[Si3 O9 ] cannot be a cyclic silicate
(4) In ortho silicates SiO4−4 unit is the basic unit

(5) Structure of pyro silicate

(6) Silicate can be prepared by fusing an alkali metal carbonate with sand

Solution: (2)

Q.16 Among the following, the number of aromatic species is ______

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Solution: (5)

Naphthalene, Pyridine, Anilines aromatic Thiophene and Pyrrole are aromatic species

Q.17 Two substances 𝐴 and 𝐵 are present such that [𝐴0 ] = 4[𝐵0 ] and half-life of 𝐴 is 5 minute and that of
𝐵 is 15 minute. If they start decaying at the same time following first order kinetics how much time
(minutes) later will the concentration of both of them would be same

Solution: (15)

Q.18 In given pairs no. of pairs in which I compound is more stable than II.

Solution: (4)

I, II, IV, V

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