Among the following, the correct order of acidity is
a.
(1) HClO3 < HClO4 < HClO2 < HClO
b.
(2) HClO < HClO2 < HClO3 < HClO4
Correct Answer
c.
(3) HClO2 < HClO < HClO3 < HClO4
d.
(4) HClO4 < HClO2 < HClO < HClO3
Step-by-Step AI Explanation
Verified Method
Acidic strength of oxoacids of chlorine increases with the oxidation state of the central atom: HClO (+1) < HClO2 (+3) < HClO3 (+5) < HClO4 (+7).
Q49mcq
The rate of a first-order reaction is 0.04 mol L⁻¹ s⁻¹ at 10 seconds and 0.03 mol L⁻¹ s⁻¹ at 20 seconds after initiation of the reaction. The half-life period of the reaction is:
a.
(1) 24.1 s
Correct Answer
b.
(2) 34.1 s
c.
(3) 44.1 s
d.
(4) 54.1 s
Step-by-Step AI Explanation
Verified Method
Using the first-order rate constant formula k = (2.303 / (t2 - t1)) * log(Rate1 / Rate2), we find k. Then t1/2 = 0.693 / k.
Q50mcq
Which one of the following characteristics is associated with adsorption?
a.
(1) ΔG is negative but ΔH and ΔS are positive
b.
(2) ΔG, ΔH and ΔS all are negative
Correct Answer
c.
(3) ΔG and ΔH are negative but ΔS is positive
d.
(4) ΔG and ΔS are negative but ΔH is positive
Step-by-Step AI Explanation
Verified Method
Adsorption is a spontaneous process (ΔG < 0), exothermic (ΔH < 0), and results in decreased entropy (ΔS < 0).
Q52mcq
Which of the following statements is false?
a.
Mg2+ ions form a complex with ATP
b.
Ca2+ ions are important in blood clotting
c.
Ca2+ ions are not important in maintaining the regular beating of the heart.
Correct Answer
d.
Mg2+ ions are important in the green parts of plants.
Step-by-Step AI Explanation
Verified Method
Ca2+ ions play a crucial role in the regulation of heart muscle contraction and maintaining the regular beating of the heart.
Q53mcq
Which of the following statements about hydrogen is incorrect?
a.
hydrogen has three isotopes of which tritium is the most common.
Correct Answer
b.
Hydrogen never acts as cation in ionic salts
c.
Hydronium ion, H3O+ exists freely in solution
d.
Dihydrogen does not act as a reducing agent
Step-by-Step AI Explanation
Verified Method
Protium (1H) is the most abundant isotope of hydrogen, not tritium. Additionally, dihydrogen (H2) acts as a reducing agent in many chemical reactions.
Q54mcq
The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha-carbon, is :-
a.
a carbonyl compound with a hydrogen atom on its alpha-carbon never equilibrates with its corresponding enol.
b.
a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as aldehyde-ketone equilibration.
c.
a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as carbonylation.
d.
a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as keto-enol tautomerism.
Correct Answer
Step-by-Step AI Explanation
Verified Method
Carbonyl compounds having alpha-hydrogen atoms undergo rapid equilibration with their corresponding enol forms, a phenomenon known as keto-enol tautomerism.
Q55mcq
MY and NY3, two nearly insoluble salts, have the same Ksp values of 6.2 × 10^-13 at room temperature. Which statement would be true in regard to MY and NY3?
a.
The molar solubilities of MY and NY3 in water are identical.
b.
The molar solubility of MY in water is less than that of NY3
Correct Answer
c.
The salts MY and NY3 are more soluble in 0.5 M KY than in pure water.
d.
The addition of the salt of KY to solution of MY and NY3 will have no effect on their solubilities.
Step-by-Step AI Explanation
Verified Method
For MY, Ksp = s^2, so s = sqrt(6.2e-13) ≈ 7.87e-7. For NY3, Ksp = 27s^4, so s = (6.2e-13/27)^(1/4) ≈ 3.89e-4. Thus, the solubility of NY3 is significantly higher.
Q56mcq
In a protein molecule various amino acids are linked together by:
a.
α-glycosidic bond
b.
β-glycosidic bond
c.
peptide bond
Correct Answer
d.
dative bond
Step-by-Step AI Explanation
Verified Method
Amino acids in proteins are linked by amide bonds formed between the carboxyl group and the amino group of successive amino acids, known as peptide bonds.
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Lithium has a bcc structure. Its density is 530 kg m^-3 and its atomic mass is 6.94 g mol^-1. Calculate the edge length of a unit cell of Lithium metal. (NA = 6.02 × 10^23 mol^-1)
a.
154 pm
b.
352 pm
c.
527 pm
d.
264 pm
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Match the compounds given in column I with the hybridisation and shape given in column II and mark the correct option. Column I: (a) XeF6, (b) XeO3, (c) XeOF4, (d) XeF4. Column II: (i) Distorted octahedral, (ii) Square planar, (iii) Pyramidal, (iv) Square pyramidal.
a.
(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)
b.
(a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)
c.
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
d.
(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
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Which of the following statement about the composition of the vapour over an ideal 1 : 1 molar mixture of benzene and toluene is correct? Assume that the temperature is constant at 25°C. (Given: Vapour Pressure Data at 25°C, benzene = 12.8 kPa, Toluene = 3.85 kPa)
a.
The vapour will contain a higher percentage of benzene
b.
The vapour will contain a higher percentage of toluene
c.
The vapour will contain equal amounts of benzene and toluene
d.
Not enough information is given to make a prediction
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The correct statement regarding the basicity of arylamines is:
a.
Arylamines are generally less basic than alkylamines because the nitrogen lone-pair electrons are delocalized by interaction with the aromatic ring π electron system.
b.
Arylamines are generally more basic than alkylamines because the nitrogen lone-pair electrons are not delocalized by interaction with the aromatic ring π electron system.
c.
Arylamines are generally more basic than alkylamines because of aryl group.
d.
Arylamines are generally more basic than alkylamines, because the nitrogen atom in arylamines is sp-hybridized.
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