Dihedral angle of least stable conformer of ethane is :
a.
120°
b.
180°
c.
60°
d.
0°
Correct Answer
Step-by-Step AI Explanation
Verified Method
Ethane exists in staggered and eclipsed conformations. The eclipsed conformation (dihedral angle 0°) has maximum torsional strain due to repulsive interactions between bonding electrons, making it the least stable.
Q52mcq
Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them.
a.
Noble gases are sparingly soluble in water
b.
Noble gases have very high melting and boiling points
Correct Answer
c.
Noble gases have weak dispersion forces
d.
Noble gases have large positive values of electron gain enthalpy
Step-by-Step AI Explanation
Verified Method
Noble gases consist of monoatomic atoms held together by weak London dispersion forces. Consequently, they have very low melting and boiling points, not high ones.
Q53mcq
The major product of the following chemical reaction is : (CH3)2CH-CH=CH2 + HBr (in presence of (C6H5CO)2O2)
a.
(CH3)2CH-CH2-CH2Br
Correct Answer
b.
Image not provided
c.
(CH3)2CH-CHBr-CH3
d.
(CH3)2CBr-CH2-CH3
Step-by-Step AI Explanation
Verified Method
The reaction proceeds via the Kharasch effect (peroxide effect), which follows anti-Markovnikov addition. The bromine radical attacks the terminal carbon to form the more stable secondary free radical intermediate, resulting in 1-bromo-3-methylbutane.
Q55mcq
The incorrect statement among the following is:
a.
Actinoid contraction is greater for element to element than lanthanoid contraction
b.
Most of the trivalent Lanthanoid ions are colorless in the solid state
Correct Answer
c.
Lanthanoids are good conductors of heat and electricity
d.
Actinoids are highly reactive metals, especially when finely divided.
Step-by-Step AI Explanation
Verified Method
Many trivalent lanthanoid ions are colored both in the solid state and in aqueous solutions due to f-f transitions, making the statement that most are colorless incorrect.
Q55mcq
The incorrect statement among the following is :
a.
Actinoid contraction is greater for element to element than lanthanoid contraction
b.
Most of the trivalent Lanthanoid ions are colorless in the solid state
Correct Answer
c.
Lanthanoids are good conductors of heat and electricity
d.
Actinoids are highly reactive metals, especially when finely divided.
Step-by-Step AI Explanation
Verified Method
Most trivalent lanthanoid ions are colored in the solid state due to f-f transitions; claiming they are colorless is incorrect.
Q57mcq
Identify the compound that will react with Hinsberg's reagent to give a solid which dissolves in alkali.
a.
CH3CH2NO2
b.
CH3CH2NHCH3
c.
CH3CH2NH2
Correct Answer
d.
CH3CH2CH2CH2CH3
Step-by-Step AI Explanation
Verified Method
Primary amines (like CH3CH2NH2) react with Hinsberg's reagent (benzenesulphonyl chloride) to form N-alkylbenzenesulphonamide, which contains an acidic hydrogen attached to nitrogen and is therefore soluble in alkali.
Q58mcq
Which of the following reactions is the metal displacement reaction? Choose the right option.
a.
2KClO3 → 2KCl + 3O2
b.
Cr2O3 + 2Al → Al2O3 + 2Cr
Correct Answer
c.
Fe + 2HCl → FeCl2 + H2
d.
2Pb(NO3)2 → 2PbO + 4NO2 + O2
Step-by-Step AI Explanation
Verified Method
A metal displacement reaction involves a more reactive metal displacing a less reactive metal from its salt solution or oxide. Reaction Cr2O3 + 2Al → Al2O3 + 2Cr is a metal displacement (aluminothermic process).
Q59mcq
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.
a.
Both Statement I and Statement II are true
b.
Both Statement I and Statement II are false
Correct Answer
c.
Statement I is correct but Statement II is false
d.
Statement I is incorrect but Statement II is true.
Step-by-Step AI Explanation
Verified Method
Aspirin and Paracetamol are non-narcotic analgesics. Morphine and Heroin are narcotic analgesics. Thus, both statements are false.
Q60mcq
What is the IUPAC name of the organic compound formed in the following chemical reaction? Acetone + (i) C2H5MgBr, dry Ether; (ii) H2O, H+
a.
2-methylpropan-2-ol
b.
pentan-2-ol
c.
pentan-3-ol
d.
2-methylbutan-2-ol
Correct Answer
Step-by-Step AI Explanation
Verified Method
Grignard reagent C2H5MgBr adding to acetone (CH3COCH3) followed by hydrolysis gives 2-methylbutan-2-ol.
Q61mcq
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.
In the light of the above statements, choose the correct answer from the options given below.
a.
Both statement I and Statement II are true
Correct Answer
b.
Both Statement I and Statement II are false
c.
Statement I is correct but statement II is false
d.
Statement I is incorrect but Statement II is true
Step-by-Step AI Explanation
Verified Method
In the modern periodic table, moving down the group as the size of the halogen atom increases, the H-X bond length increases and bond enthalpy decreases. Hence, acidic strength increases in the order HI > HBr > HCl > HF.
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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.
Both statement I and Statement II are true
b.
Both statement I and Statement II are false
c.
Statement I is correct but statement II is false
d.
Statement I is incorrect but Statement II is true
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The following solutions were prepared by dissolving 10 g of glucose (C6H12O6) in 250 ml of water (P1), 10 g of urea (CH4N2O) in 250 ml of water (P2) and 10 g of sucrose (C12H22O11) in 250 ml of water (P3). The right option for the decreasing order of osmotic pressure of these solutions is:
a.
P2 > P1 > P3
b.
P1 > P2 > P3
c.
P2 > P3 > P1
d.
P3 > P1 > P2
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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.
201.28 S cm^2 mol^–1
b.
390.71 S cm^2 mol^–1
c.
698.28 S cm^2 mol^–1
d.
540.48 S cm^2 mol^–1
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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.
CH
b.
CH2
c.
CH3
d.
CH4
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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.
CH
b.
CH2
c.
CH3
d.
CH4
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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.
8.50
b.
5.50
c.
7.75
d.
6.25
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For a reaction A -> B, enthalpy of reaction is -4.2 kJ mol-1 and enthalpy of activation is 9.6 kJ mol-1. The correct potential energy profile for the reaction is shown in option.
a.
PE profile showing higher product level
b.
PE profile showing lower product level (exothermic) with activation barrier
c.
PE profile showing higher product level
d.
PE profile showing flat level
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Match List-I with List-II.
List-I List-II
(a) [Fe(CN)6]3– (i) 5.92 BM
(b) [Fe(H2O)6]3+ (ii) 0 BM
(c) [Fe(CN)6]4– (iii) 4.90 BM
(d) [Fe(H2O)6]2+ (iv) 1.73 BM
Choose the correct answer from the options given below.
a.
(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
b.
(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
c.
(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)
d.
(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
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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.
160 mm of Hg
b.
168 mm of Hg
c.
336 mm of Hg
d.
350 mm of Hg
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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.
160 mm of Hg
b.
168 mm of Hg
c.
336 mm of Hg
d.
350 mm of Hg
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The molar conductivity of 0.007 M acetic acid is 20 S cm^2 mol^–1. What is the dissociation constant of acetic acid? Given: Λ°_m(H^+) = 350 S cm^2 mol^–1 and Λ°_m(CH3COO^-) = 50 S cm^2 mol^–1.
a.
1.75 * 10^-4 mol L^-1
b.
2.50 * 10^-4 mol L^-1
c.
1.75 * 10^-5 mol L^-1
d.
2.50 * 10^-5 mol L^-1
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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. [Given R = 0.082 L atm mol⁻¹ K⁻¹]
a.
2.518
b.
2.602
c.
25.18
d.
26.02
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Match List-I with List-II.
List-I
(a) Protein
(b) Unsaturated fatty acid
(c) Nucleic acid
(d) Polysaccharide
List-II
(i) C = C double bonds
(ii) Phosphodiester bonds
(iii) Glycosidic bonds
(iv) Peptide bonds
Choose the correct answer from the options given below.
a.
(1) (iv) (i) (ii) (iii)
b.
(2) (i) (iv) (iii) (ii)
c.
(3) (ii) (i) (iv) (iii)
d.
(4) (iv) (iii) (i) (ii)
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Following are the statements with reference to 'lipids'.
(a) Lipids having only single bonds are called unsaturated fatty acids
(b) Lecithin is a phospholipid.
(c) Trihydroxy propane is glycerol.
(d) Palmitic acid has 20 carbon atoms including carboxyl carbon.
(e) Arachidonic acid has 16 carbon atoms.
Choose the correct answer from the options given below:
a.
(a) and (b) only
b.
(c) and (d) only
c.
(b) and (c) only
d.
(b) and (e) only
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