Predict the correct intermediate and product in the following reaction: CH3C≡CH + H2O, H2SO4 / HgSO4 → intermediate product
a.
A: CH3COCH3 ; B: CH3C≡CH
b.
A: CH3CH2OH ; B: CH3COCH3
Correct Answer
c.
A: CH3CH2SO4H ; B: CH3COCH3
d.
A: CH3CH2OH ; B: CH3CH2SO4H
Step-by-Step AI Explanation
Verified Method
Hydration of propyne under HgSO4/H2SO4 gives the enol CH3C(OH)=CH2 as the intermediate, which tautomerises to acetone (CH3COCH3). The option text is OCR-corrupted; the intended correct choice is the one with enol intermediate and acetone product.
Q139mcq
It is because of inability of ns^2 electrons of the valence shell to participate in bonding that
a.
Sn2+ and Pb2+ are both oxidising and reducing
b.
Sn4+ is reducing while Pb4+ is oxidising
c.
Sn2+ is reducing while Pb4+ is oxidising
Correct Answer
d.
Sn2+ is oxidising while Pb4+ is reducing
Step-by-Step AI Explanation
Verified Method
Due to inert pair effect, Pb(II) is more stable than Pb(IV), so Pb4+ is a strong oxidising agent. Sn(II) is less stable than Sn(IV), so Sn2+ acts as a reducing agent.
Q140mcq
Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts is put under an electric field?
a.
Rb
b.
Li
Correct Answer
c.
Na
d.
K
Step-by-Step AI Explanation
Verified Method
Li+ is most strongly hydrated due to its small size and therefore has the largest effective hydrated radius, so it moves slowest and has the lowest ionic mobility.
Q141mcq
Match the interhalogen compounds of Column I with the geometry in Column II and assign the correct code.
Interhalogens have standard geometries: XX′ is linear, XX′3 is T-shaped, XX′5 is square-pyramidal, and XX′7 is pentagonal bipyramidal.
Q141mcq
Match the interhalogen compounds of column I with the geometry in column II and assign the correct code.
Column I: (a) XX', (b) XX'3, (c) XX'5, (d) XX'7
Column II: (i) T-shape, (ii) Pentagonal bipyramidal, (iii) Linear, (iv) Square-pyramidal, (v) Tetrahedral
a.
(v) (iv) (iii) (ii)
b.
(iv) (iii) (ii) (i)
c.
(iii) (iv) (i) (ii)
d.
(iii) (i) (iv) (ii)
Correct Answer
Step-by-Step AI Explanation
Verified Method
XX' is linear, XX'3 is T-shaped, XX'5 is square-pyramidal, and XX'7 is pentagonal bipyramidal.
Q142mcq
Which of the following statements is incorrect?
a.
NaCl(s) is an insulator, silicon is a semiconductor, silver is a conductor, quartz is a piezoelectric crystal
b.
Frenkel defect is favoured in those ionic compounds in which sizes of cation and anion are almost equal
Correct Answer
c.
FeO0.98 has non-stoichiometric metal deficiency defect
d.
Density decreases in case of crystals with Schottky's defect
Step-by-Step AI Explanation
Verified Method
Frenkel defect is favoured when there is a large difference in cation and anion sizes; it is not favoured when sizes are almost equal.
Q143mcq
Which one of the following statements is not correct?
a.
Enzymes catalyse mainly biochemical reactions
b.
Coenzymes increase the catalytic activity of enzyme
c.
Catalyst does not initiate any reaction
d.
The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium
Correct Answer
Step-by-Step AI Explanation
Verified Method
A catalyst changes the rate of attainment of equilibrium but does not change the equilibrium constant at a given temperature.
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In the electrochemical cell Zn|ZnSO4 (0.01 M)||CuSO4 (1.0 M)|Cu, the emf of this Daniell cell is E1. When the concentration of ZnSO4 is changed to 1.0 M and that of CuSO4 is changed to 0.01 M, the emf changes to E2. From the following, which one is the relationship between E1 and E2? Given RT/F = 0.059.
a.
E1 > E2
b.
E2 = 0 ≠ E1
c.
E1 = E2
d.
E1 < E2
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The correct order of the stoichiometries of AgCl formed when AgNO3 in excess is treated with the complexes CoCl3·6NH3, CoCl3·5NH3, and CoCl3·4NH3 respectively is:
a.
3 AgCl, 2 AgCl, 1 AgCl
b.
2 AgCl, 3 AgCl, 1 AgCl
c.
1 AgCl, 3 AgCl, 2 AgCl
d.
3 AgCl, 1 AgCl, 2 AgCl
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The equilibrium constants of the following are: N2 + 3H2 ⇌ 2NH3, K1; N2 + O2 ⇌ 2NO, K2; 2H2 + O2 ⇌ 2H2O, K3. The equilibrium constant K of the reaction 2NH3 + 5/2 O2 ⇌ 2NO + 3H2O will be:
a.
K2K3/K1
b.
K3/(K2^3 K1)
c.
K3/(K1 K2^3)
d.
K2K3/(K1^3)
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The equilibrium constants of the following are:
N2 + 3H2 ⇌ 2NH3, K1
N2 + O2 ⇌ 2NO, K2
2H2 + O2 ⇌ 2H2O, K3
The equilibrium constant K of the reaction 2NH3 + 2NO → N2 + 3H2O will be
a.
K2K3 / K1
b.
K3^2 / (K2K1)
c.
K3 / (K1K2)
d.
K3^2K1 / K2
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Mechanism of a hypothetical reaction X2 + Y2 → 2XY is given below:
(i) X2 → X + X (fast)
(ii) X + Y2 → XY + Y (slow)
(iii) X + Y → XY (fast)
The overall order of the reaction will be
a.
0
b.
1.5
c.
1
d.
2
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For a given reaction, ΔH = 35.5 kJ mol−1 and ΔS = 83.6 J K−1 mol−1. The reaction is spontaneous at: (Assume that ΔH and ΔS do not vary with temperature)
a.
All temperatures
b.
T > 298 K
c.
T < 425 K
d.
T > 425 K
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For a given reaction, ΔH = 35.5 kJ mol−1 and ΔS = 83.6 J K−1 mol−1. The reaction is spontaneous at: (Assume that ΔH and ΔS do not vary with temperature)
a.
All temperatures
b.
T > 298 K
c.
T < 425 K
d.
T > 425 K
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A 20 litre container at 400 K contains CO2(g) at pressure 0.4 atm and an excess of SrO (neglect the volume of solid SrO). The volume of the container is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when pressure of CO2 attains its maximum value, will be: Given that SrCO3(s) ⇌ SrO(s) + CO2(g), Kp = 1.6 atm
a.
4 litre
b.
2 litre
c.
5 litre
d.
10 litre
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A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy ΔU of the gas in joules will be
a.
−505 J
b.
+505 J
c.
1136.25 J
d.
−500 J
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