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.
Hexadentate ligand with four “O” and two “N” donor atoms
Correct Answer
Step-by-Step AI Explanation
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EDTA4- is a hexadentate ligand with four oxygen atoms from carboxylate groups and two nitrogen atoms as donor sites.
Q54mcq
The RBC deficiency is deficiency disease of :
a.
Vitamin B6
b.
Vitamin B1
c.
Vitamin B2
d.
Vitamin B12
Correct Answer
Step-by-Step AI Explanation
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Deficiency of Vitamin B12 (cyanocobalamin) causes pernicious anemia (RBC deficiency).
Q55mcq
BF3 is planar and electron deficient compound. Hybridization and number of electrons around the central atom, respectively are :
a.
sp^3 and 6
b.
sp^2 and 6
Correct Answer
c.
sp^2 and 8
d.
sp^3 and 4
Step-by-Step AI Explanation
Verified Method
Boron in BF3 has 3 bond pairs (3*2 = 6 electrons), hence electron deficient and sp2 hybridized.
Q55mcq
BF3 is planar and electron deficient compound. Hybridization and number of electrons around the central atom, respectively are :
a.
sp3 and 6
b.
sp2 and 6
Correct Answer
c.
sp2 and 8
d.
sp3 and 4
Step-by-Step AI Explanation
Verified Method
Boron in BF3 has 3 bond pairs (no lone pairs), so it is sp2 hybridized. It has 6 valence electrons around the central B atom, making it electron-deficient.
Q57mcq
The incorrect statement among the following is :
a.
Most of the trivalent Lanthanoid ions are colorless in the solid state.
Correct Answer
b.
Lanthanoids are good conductors of heat and electricity.
c.
Actinoids are highly reactive metals, especially when finely divided.
d.
Actinoid contraction is greater for element to element than Lanthanoid contraction.
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Most trivalent lanthanoid ions are colored due to f-f transitions. Statement (a) is incorrect.
Q57mcq
The incorrect statement among the following is :
a.
Most of the trivalent Lanthanoid ions are colorless in the solid state.
Correct Answer
b.
Lanthanoids are good conductors of heat and electricity.
c.
Actinoids are highly reactive metals, especially when finely divided.
d.
Actinoid contraction is greater for element to element than Lanthanoid contraction.
Step-by-Step AI Explanation
Verified Method
Trivalent lanthanoid ions are mostly colored due to f-f transitions.
Q58mcq
Tritium, a radioactive isotope of hydrogen, emits which of the following particles ?
a.
Alpha (α)
b.
Gamma (γ)
c.
Neutron (n)
d.
Beta (β−)
Correct Answer
Step-by-Step AI Explanation
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Tritium (3H) is a low-energy beta emitter, decaying into Helium-3.
Q61mcq
The compound which shows metamerism is :
a.
C3H8O
b.
C3H6O
c.
C4H10O
Correct Answer
d.
C5H12
Step-by-Step AI Explanation
Verified Method
Metamerism requires a polyvalent functional group like ether (-O-). C4H10O (diethyl ether vs. methyl propyl ether) shows metamerism.
Q64mcq
Match List - I with List - II.
List - I List - II
(a) PCl5 (i) Square pyramidal
(b) SF6 (ii) Trigonal planar
(c) BrF5 (iii) Octahedral
(d) BF3 (iv) Trigonal bipyramidal
Choose the correct answer from the options given below.
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.
5.50
b.
7.75
c.
6.25
d.
8.50
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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.
P1 > P2 > P3
b.
P2 > P3 > P1
c.
P3 > P1 > P2
d.
P2 > P1 > P3
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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 false.
b.
Statement I is correct but Statement II is false.
c.
Statement I is incorrect but Statement II is true.
d.
Both Statement I and Statement II are true.
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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.
CH2
b.
CH3
c.
CH4
d.
CH
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The slope of Arrhenius Plot ln k v/s 1/T of first order reaction is -5×10^3 K. The value of Ea of the reaction is. Choose the correct option for your answer. [Given R=8.314 JK^-1mol^-1]
a.
83.0 kJ mol^-1
b.
166 kJ mol^-1
c.
-83 kJ mol^-1
d.
41.5 kJ mol^-1
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Match List - I with List - II.
List - I: Complexes
(a) [Fe(CN)6]3-
(b) [Fe(H2O)6]3+
(c) [Fe(CN)6]4-
(d) [Fe(H2O)6]2+
List - II: Magnetic Moment
(i) 5.92 BM
(ii) 0 BM
(iii) 4.90 BM
(iv) 1.73 BM
Choose the correct answer from the options given below.
a.
(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
b.
(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)
c.
(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
d.
(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
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Match List - I with List - II.
(a) R-COOH + R'OH/H+ → Ester
(b) R-CH3 + X2/Red P → R-CH2COOH (Hell-Volhard-Zelinsky)
(c) R-CH2-OH + [O] → RCOOH
(d) R-CO-CH3 + X2/NaOH → R-COONa + CHX3 (Haloform)
Choose the correct answer from the options given below.
a.
(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
b.
(a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)
c.
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
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.
168 mm of Hg
b.
336 mm of Hg
c.
350 mm of Hg
d.
160 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°(H+) = 350 S cm^2 mol^-1, Λ°(CH3COO-) = 50 S cm^2 mol^-1)
a.
2.50×10^-4 mol L^-1
b.
1.75×10^-5 mol L^-1
c.
2.50×10^-5 mol L^-1
d.
1.75×10^-4 mol L^-1
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