Malachite is a copper carbonate hydroxide mineral with the chemical formula Cu2CO3(OH)2, commonly written as CuCO3.Cu(OH)2.
Q137mcq
Enzymes that utilize ATP in phosphate transfer require an alkaline earth metal (M) as the cofactor. M is :
a.
Sr
b.
Be
c.
Mg
Correct Answer
d.
Ca
Step-by-Step AI Explanation
Verified Method
Magnesium (Mg2+) acts as a vital cofactor for many enzymes involved in ATP-dependent phosphate transfer reactions.
Q138mcq
For an ideal solution, the correct option is :
a.
Δmix G = 0 at constant T and P
b.
Δmix S = 0 at constant T and P
c.
Δmix V ≠ 0 at constant T and P
d.
Δmix H = 0 at constant T and P
Correct Answer
Step-by-Step AI Explanation
Verified Method
For an ideal solution, the enthalpy of mixing (ΔmixH) is zero, and the volume of mixing (ΔmixV) is zero.
Q139mcq
What is the correct electronic configuration of the central atom in K4[Fe(CN)6] based on crystal field theory?
a.
t2g^4 eg^2
b.
t2g^2 eg^4
c.
t2g^6 eg^0
Correct Answer
d.
t2g^3 eg^3
Step-by-Step AI Explanation
Verified Method
Fe in K4[Fe(CN)6] is Fe2+ (3d6). CN- is a strong field ligand, causing pairing of electrons in the t2g orbitals, resulting in a t2g^6 eg^0 configuration.
Q140mcq
The number of sigma (σ) and pi (π) bonds in pent-2-en-4-yne is
a.
13σ bonds and no π bonds
b.
10σ bonds and 3π bonds
Correct Answer
c.
8σ bonds and 5π bonds
d.
11σ bonds and 2π bonds
Step-by-Step AI Explanation
Verified Method
Structure is CH3-CH=CH-C≡CH. Counting the bonds: there are 10 sigma bonds and 3 pi bonds (one in double bond, two in triple bond).
Q142mcq
The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is :
a.
40
b.
10
c.
20
d.
30
Correct Answer
Step-by-Step AI Explanation
Verified Method
Reaction: N2 + 3H2 → 2NH3. 2 moles of NH3 require 3 moles of H2. 20 moles of NH3 require (3/2) × 20 = 30 moles of H2.
Q143mcq
Which of the following is incorrect statement?
a.
SnF4 is ionic in nature
b.
PbF4 is covalent in nature
Correct Answer
c.
SiCl4 is easily hydrolysed
d.
GeX4 (X = F, Cl, Br, I) is more stable than GeX2
Step-by-Step AI Explanation
Verified Method
PbF4 and SnF4 are ionic in nature.
Q143mcq
Which of the following is incorrect statement?
a.
SnF4 is ionic in nature
b.
PbF4 is covalent in nature
Correct Answer
c.
SiCl4 is easily hydrolysed
d.
GeX4 (X = F, Cl, Br, I) is more stable than GeX2
Step-by-Step AI Explanation
Verified Method
Both PbF4 and SnF4 are primarily ionic in nature. Statement b is incorrect.
Q144mcq
Which of the following is an amphoteric hydroxide?
a.
Be(OH)2
Correct Answer
b.
Sr(OH)2
c.
Ca(OH)2
d.
Mg(OH)2
Step-by-Step AI Explanation
Verified Method
Be(OH)2 is amphoteric in nature, since it can react both with acid and base: Be(OH)2 + 2HCl -> BeCl2 + 2H2O; Be(OH)2 + 2NaOH -> Na2[Be(OH)4].
Q144mcq
Which of the following is an amphoteric hydroxide?
a.
Be(OH)2
Correct Answer
b.
Sr(OH)2
c.
Ca(OH)2
d.
Mg(OH)2
Step-by-Step AI Explanation
Verified Method
Beryllium hydroxide, Be(OH)2, is amphoteric as it reacts with both acids and bases.
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Match the Xenon compounds in Column-I with its structure in Column-II and assign the correct code: Column-I: (a) XeF4, (b) XeF6, (c) XeOF4, (d) XeO3. Column-II: (i) Pyramidal, (ii) Square planar, (iii) Distorted octahedral, (iv) Square pyramidal.
a.
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
b.
(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
c.
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
d.
(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
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An alkene "A" on reaction with O3 and Zn-H2O gives propanone and ethanal in equimolar ratio. Addition of HCl to alkene "A" gives "B" as the major product. The structure of product "B" is:
a.
H3C-CH(Cl)-CH(CH3)2
b.
Cl-CH2-CH2-CH(CH3)2
c.
H3C-CH2-CH(Cl)-CH2-CH3
d.
H3C-CH2-C(Cl)(CH3)2
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Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar. The work done by the gas is (Given that 1 L bar = 100 J)
a.
30 J
b.
-30 J
c.
5 kJ
d.
25 J
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For the cell reaction 2Fe3+(aq) + 2I-(aq) → 2Fe2+(aq) + I2(s), Ecell = 0.24 V at 298 K. The standard Gibbs energy (ΔrG) of the cell reaction is: [Given that Faraday constant F = 96500 C mol–1]
a.
23.16 kJ mol–1
b.
– 46.32 kJ mol–1
c.
– 23.16 kJ mol–1
d.
46.32 kJ mol–1
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