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
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Boron in BF3 has 3 bond pairs (3*2 = 6 electrons) and sp2 hybridization.
Q55mcq
The structures of beryllium chloride in solid state and vapour phase, are :
a.
Dimer and Linear, respectively
b.
Chain in both
c.
Chain and dimer, respectively
Correct Answer
d.
Linear in both
Step-by-Step AI Explanation
Verified Method
In the vapour phase, BeCl2 exists as a dimer (Be2Cl4) with a linear structure at very high temperatures, but primarily as a monomer/dimer mixture. However, in the solid state, it exists as a polymeric chain structure to satisfy the octet rule.
Q56mcq
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 similarity in atomic and ionic radii between 4d and 5d transition elements (like Zr and Hf) is due to lanthanoid contraction, which is the steady decrease in atomic and ionic radii as the atomic number increases across the lanthanoid series.
Q56mcq
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 leads to lanthanoid contraction, which offsets the increase in atomic size down the group from Zr to Hf.
Q58mcq
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
Correct Answer
b.
CH4
c.
CH
d.
CH2
Step-by-Step AI Explanation
Verified Method
Moles of C = 78/12 = 6.5. Moles of H = 22/1 = 22. Ratio = 6.5 : 22 ≈ 1 : 3.38. Empirical formula approximates to CH3.
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 with four oxygen atoms from carboxylate groups and two nitrogen atoms from amine groups as donor sites.
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 classic hexadentate ligand with 4 oxygen donor atoms from carboxylate groups and 2 nitrogen donor atoms from amine groups.
Q60mcq
Among the following alkaline earth metal halides, one which is covalent and soluble in organic solvents is :
a.
Magnesium chloride
b.
Beryllium chloride
Correct Answer
c.
Calcium chloride
d.
Strontium chloride
Step-by-Step AI Explanation
Verified Method
Beryllium chloride (BeCl2) is covalent due to the high charge density and small size of Be(2+), making it soluble in organic solvents.
Q62mcq
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. Choose the right option for your answer.
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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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 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
d.
P1 > P2 > P3
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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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Match List - I with List - II regarding magnetic moments of complexes.
List I: (a) [Fe(CN)6]³⁻, (b) [Fe(H2O)6]³⁺, (c) [Fe(CN)6]⁴⁻, (d) [Fe(H2O)6]²⁺
List II: (i) 5.92 BM, (ii) 0 BM, (iii) 4.90 BM, (iv) 1.73 BM
a.
(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)
b.
(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
c.
(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
d.
(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
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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.
(a) Protein (i) C=C double bonds
(b) Unsaturated fatty acid (ii) Phosphodiester bonds
(c) Nucleic acid (iii) Glycosidic bonds
(d) Polysaccharide (iv) Peptide bonds
Choose the correct answer from the options given below.
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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