Metamerism occurs in ethers (among others) where the alkyl groups attached to the heteroatom vary. C4H10O can exist as diethyl ether (CH3CH2-O-CH2CH3) or methyl propyl ether (CH3-O-CH2CH2CH3).
Q54mcq
Zr (Z=40) and Hf (Z=72) have similar atomic and ionic radii because of:
a.
lanthanoid contraction
Correct Answer
b.
having similar chemical properties
c.
belonging to same group
d.
diagonal relationship
Step-by-Step AI Explanation
Verified Method
The filling of 4f orbitals causes lanthanoid contraction, which offsets the expected increase in size down the group, making Zr and Hf have almost identical radii.
Q55mcq
Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are:
a.
2, 1
b.
12, 6
Correct Answer
c.
8, 4
d.
6, 12
Step-by-Step AI Explanation
Verified Method
In HCP, the number of atoms per unit cell is 6. Octahedral voids = n = 6. Tetrahedral voids = 2n = 12.
Q56mcq
BF3 is planar and electron deficient compound. Hybridization and number of electrons around the central atom, respectively are:
a.
sp2 and 6
Correct Answer
b.
sp2 and 8
c.
sp3 and 4
d.
sp3 and 6
Step-by-Step AI Explanation
Verified Method
Boron in BF3 has 3 valence electrons and forms 3 bonds (6 electrons total), hence it is sp2 hybridized and electron deficient (incomplete octet).
Q56mcq
BF3 is planar and electron deficient compound. Hybridization and number of electrons around the central atom, respectively are :
a.
sp2 and 6
Correct Answer
b.
sp2 and 8
c.
sp3 and 4
d.
sp3 and 6
Step-by-Step AI Explanation
Verified Method
In BF3, Boron has 3 valence electrons and forms 3 single bonds with Fluorine atoms, resulting in 6 electrons in its valence shell. The steric number is 3, leading to sp2 hybridization.
Q57mcq
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 > P3 > P1
b.
P3 > P1 > P2
c.
P2 > P1 > P3
Correct Answer
d.
P1 > P2 > P3
Step-by-Step AI Explanation
Verified Method
Osmotic pressure (pi) is proportional to molarity (M = mass / (Molar mass * Volume)). Molar masses: Urea (60) < Glucose (180) < Sucrose (342). Since mass and volume are equal, osmotic pressure follows inverse order of molar mass: Urea > Glucose > Sucrose.
Q58mcq
Tritium, a radioactive isotope of hydrogen, emits which of the following particles?
a.
Gamma (γ)
b.
Neutron (n)
c.
Beta (β-)
Correct Answer
d.
Alpha (α)
Step-by-Step AI Explanation
Verified Method
Tritium (3H) decays into Helium-3 by emitting a beta-minus particle (electron).
Q59mcq
Ethylene diaminetetraacetate (EDTA) ion is :
a.
Bidentate ligand with two “N” donor atoms
b.
Tridentate ligand with three “N” donor atoms
c.
Hexadentate ligand with four “O” and two “N” donor atoms
Correct Answer
d.
Unidentate ligand
Step-by-Step AI Explanation
Verified Method
EDTA4- is a well-known hexadentate ligand featuring two amine nitrogen atoms and four carboxylate oxygen atoms as donors.
Q59mcq
Ethylene diaminetetraacetate (EDTA) ion is:
a.
Bidentate ligand with two “N” donor atoms
b.
Tridentate ligand with three “N” donor atoms
c.
Hexadentate ligand with four “O” and two “N” donor atoms
Correct Answer
d.
Unidentate ligand
Step-by-Step AI Explanation
Verified Method
EDTA^4- is a hexadentate ligand featuring 4 oxygen atoms (from carboxylate groups) and 2 nitrogen atoms as donors.
Q61mcq
The major product formed in dehydrohalogenation reaction of 2-Bromo pentane is Pent-2-ene. This product formation is based on ?
a.
Hofmann Rule
b.
Huckel’s Rule
c.
Saytzeff’s Rule
Correct Answer
d.
Hund’s Rule
Step-by-Step AI Explanation
Verified Method
According to Saytzeff's rule, the more substituted alkene is the major product in dehydrohalogenation reactions.
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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.
CH3
b.
CH4
c.
CH
d.
CH2
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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.
a.
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
b.
(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
c.
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
d.
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
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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.
Statement I is correct but Statement II is false.
b.
Statement I is incorrect but Statement II is true.
c.
Both Statement I and Statement II are true.
d.
Both Statement I and Statement II are 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.
7.75
b.
6.25
c.
8.50
d.
5.50
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The molar conductance of NaCl, HCl and CH3COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm2 mol−1 respectively. The molar conductance of CH3COOH at infinite dilution is.
a.
698.28 S cm2 mol−1
b.
540.48 S cm2 mol−1
c.
201.28 S cm2 mol−1
d.
390.71 S cm2 mol−1
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The molar conductance of NaCl, HCl and CH3COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm2 mol−1 respectively. The molar conductance of CH3COOH at infinite dilution is.
a.
698.28 S cm2 mol−1
b.
540.48 S cm2 mol−1
c.
201.28 S cm2 mol−1
d.
390.71 S cm2 mol−1
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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 correct but Statement II is false.
b.
Statement I is incorrect but Statement II is true.
c.
Both Statement I and Statement II are true.
d.
Both Statement I and Statement II are 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.
336 mm of Hg
b.
350 mm of Hg
c.
160 mm of Hg
d.
168 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.
336 mm of Hg
b.
350 mm of Hg
c.
160 mm of Hg
d.
168 mm of Hg
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The molar conductivity of 0.007 M acetic acid is 20 S cm² mol⁻¹. What is the dissociation constant of acetic acid? Given: Λ°(H+) = 350 S cm² mol⁻¹, Λ°(CH3COO-) = 50 S cm² mol⁻¹.
a.
1.75×10⁻⁵ mol L⁻¹
b.
2.50×10⁻⁵ mol L⁻¹
c.
1.75×10⁻⁴ mol L⁻¹
d.
2.50×10⁻⁴ mol L⁻¹
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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.
a.
(1)(ii)(i)(iv)(iii)
b.
(2)(iv)(iii)(i)(ii)
c.
(3)(iv)(i)(ii)(iii)
d.
(4)(i)(iv)(iii)(ii)
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