Dihedral angle of least stable conformer of ethane is:
a.
0°
Correct Answer
b.
120°
c.
180°
d.
60°
Step-by-Step AI Explanation
Verified Method
The eclipsed conformer of ethane has the highest potential energy due to torsional strain and is thus the least stable. The dihedral angle for the eclipsed conformer is 0°.
Q52mcq
The structures of beryllium chloride in solid state and vapour phase, are:
a.
Chain in both
b.
Chain and dimer, respectively
Correct Answer
c.
Linear in both
d.
Dimer and Linear, respectively
Step-by-Step AI Explanation
Verified Method
Beryllium chloride exists as a polymeric chain structure in the solid state to satisfy the octet, and as a dimer (or sometimes monomer at high temperature) in the vapor phase.
Q54mcq
The molar conductance of NaCl, HCl and CH3COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm^2 mol^-1 respectively. The molar conductance of CH3COOH at infinite dilution is.
a.
540.48 S cm^2 mol^-1
b.
201.28 S cm^2 mol^-1
c.
390.71 S cm^2 mol^-1
Correct Answer
d.
698.28 S cm^2 mol^-1
Step-by-Step AI Explanation
Verified Method
According to Kohlrausch's law: lambda(CH3COOH) = lambda(CH3COONa) + lambda(HCl) - lambda(NaCl) = 91.0 + 426.16 - 126.45 = 390.71 S cm^2 mol^-1.
Q55mcq
Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are:
a.
12, 6
Correct Answer
b.
8, 4
c.
6, 12
d.
2, 1
Step-by-Step AI Explanation
Verified Method
In HCP, the number of atoms (N) = 6. Octahedral voids = N = 6. Tetrahedral voids = 2N = 12.
Q56mcq
Tritium, a radioactive isotope of hydrogen, emits which of the following particles?
a.
Neutron (n)
b.
Beta (β-)
Correct Answer
c.
Alpha (α)
d.
Gamma (γ)
Step-by-Step AI Explanation
Verified Method
Tritium (3H) is a radioactive isotope that undergoes beta decay to form Helium-3: 3H -> 3He + e- + anti-neutrino.
Q56mcq
Tritium, a radioactive isotope of hydrogen, emits which of the following particles ?
a.
Neutron (n)
b.
Beta (β-)
Correct Answer
c.
Alpha (α)
d.
Gamma (γ)
Step-by-Step AI Explanation
Verified Method
Tritium (3H) is a radioactive isotope that decays by emitting a beta particle (electron) to form Helium-3 (3He).
Q57mcq
An organic compound contains 78% (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is : [Atomic wt. of C is 12, H is 1]
a.
CH4
b.
CH
c.
CH2
d.
CH3
Correct Answer
Step-by-Step AI Explanation
Verified Method
Carbon = 78%, Hydrogen = 22%. Moles of C = 78/12 = 6.5. Moles of H = 22/1 = 22. Ratio H:C = 22/6.5 ≈ 3.38, which corresponds to the empirical formula CH3.
Q57mcq
An organic compound contains 78% (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is: [Atomic wt. of C is 12, H is 1]
a.
CH4
b.
CH
c.
CH2
d.
CH3
Correct Answer
Step-by-Step AI Explanation
Verified Method
Carbon: 78/12 = 6.5. Hydrogen: 22/1 = 22. Ratio = 22/6.5 = 3.38. Checking options: CH3 is C:H = 12:3 = 4:1. Wait, recalculating: C=78, H=22. 78/12 = 6.5 moles, 22/1 = 22 moles. Ratio H/C = 22/6.5 ≈ 3.38. Empirical formula closest is CH3 (ratio 3).
Q58mcq
What is the IUPAC name of the organic compound formed in the following chemical reaction ? Acetone + C2H5MgBr (dry Ether) followed by H3O+
a.
2-methyl butan-2-ol
Correct Answer
b.
2-methyl propan-2-ol
c.
pentan-2-ol
d.
pentan-3-ol
Step-by-Step AI Explanation
Verified Method
Acetone (propanone) reacting with ethyl magnesium bromide (Grignard reagent) produces 2-methylbutan-2-ol after acidic hydrolysis.
Q61mcq
Match List - I with List - II. List-I: (a) PCl5, (b) SF6, (c) BrF5, (d) BF3. List-II: (i) Square pyramidal, (ii) Trigonal planar, (iii) Octahedral, (iv) Trigonal bipyramidal.
Statement I: Acid strength increases in the order given as HF << HCl << HBr << HI. Statement II: As the size of the elements F, Cl, Br, I increases down the group, the bond strength of HF, HCl, HBr and HI decreases and so the acid strength increases.
a.
Statement I is incorrect but Statement II is true.
b.
Both Statement I and Statement II are true.
c.
Both Statement I and Statement II are false.
d.
Statement I is correct but Statement II is false.
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The pKb of dimethylamine and pKa of acetic acid are 3.27 and 4.77 respectively at T (K). The correct option for the pH of dimethylammonium acetate solution is :
a.
6.25
b.
8.50
c.
5.50
d.
7.75
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The following solutions were prepared by dissolving 10 g of glucose, urea, and sucrose in 250 ml of water. The right option for the decreasing order of osmotic pressure of these solutions is :
a.
P3 > P1 > P2
b.
P2 > P1 > P3
c.
P1 > P2 > P3
d.
P2 > P3 > P1
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Given below are two statements: Statement I: Aspirin and Paracetamol belong to the class of narcotic analgesics. Statement II: Morphine and Heroin are non-narcotic analgesics. In the light of the above statements, choose the correct answer from the options given below.
a.
Statement I is incorrect but Statement II is true.
b.
Both Statement I and Statement II are true.
c.
Both Statement I and Statement II are false.
d.
Statement I is correct but Statement II is false.
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The correct option for the value of vapour pressure of a solution at 45°C with benzene to octane in molar ratio 3 : 2 is : [At 45°C vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg. Assume Ideal gas]
a.
350 mm of Hg
b.
160 mm of Hg
c.
168 mm of Hg
d.
336 mm of Hg
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Choose the correct option for the total pressure (in atm.) in a mixture of 4 g O2 and 2 g H2 confined in a total volume of one litre at 0°C is : [Given R=0.082 L atm mol^-1 K^-1, T=273 K]
a.
26.02
b.
2.518
c.
2.602
d.
25.18
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The molar conductivity of 0.007 M acetic acid is 20 S cm^2 mol^-1. Given Lambda infinity (H+) = 350 and Lambda infinity (CH3COO-) = 50. What is the dissociation constant?
a.
2.50×10^-5 mol L^-1
b.
1.75×10^-4 mol L^-1
c.
2.50×10^-4 mol L^-1
d.
1.75×10^-5 mol L^-1
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