Lysine is a basic amino acid because it has an extra amino group (−NH₂) in its R group, making it positively charged at physiological pH. Valine is nonpolar, Tyrosine is polar uncharged, and Glutamic acid is an acidic amino acid.
Q91mcq
Which of the following oxoacids of sulphur has –O–O– linkage?
a.
H₂S₂O₈, peroxodisulphuric acid
Correct Answer
b.
H₂S₂O₇, pyrosulphuric acid
c.
H₂SO₃, sulphurous acid
d.
H₂SO₄, sulphuric acid
Step-by-Step AI Explanation
Verified Method
H₂S₂O₈ (peroxodisulphuric acid / Marshall's acid) contains a peroxide linkage (–O–O–). Its structure is HO–SO₂–O–O–SO₂–OH. H₂S₂O₇ contains a S–O–S bridge (not peroxide), and H₂SO₃ and H₂SO₄ have no peroxide linkage.
Q92mcq
An increase in the concentration of the reactants of a reaction leads to change in
a.
threshold energy
b.
collision frequency
Correct Answer
c.
activation energy
d.
heat of reaction
Step-by-Step AI Explanation
Verified Method
Increasing the concentration of reactants increases the number of molecules per unit volume, thereby increasing the collision frequency. Threshold energy, activation energy, and heat of reaction are intrinsic properties of the reaction and are not affected by concentration changes.
Q93mcq
Identify the incorrect match.
Name — IUPAC Official Name
(a) Unnilunium — Mendelevium
(b) Unniltrium — Lawrencium
(c) Unnilhexium — Seaborgium
(d) Unununnium — Darmstadtium
a.
(c), (iii)
b.
(d), (iv)
Correct Answer
c.
(a), (i)
d.
(b), (ii)
Step-by-Step AI Explanation
Verified Method
Unununnium (Uuu) is the IUPAC systematic name for element 111, whose official name is Roentgenium (Rg), not Darmstadtium. Darmstadtium (Ds) is element 110, whose systematic name is Ununnilium. Hence (d) — Darmstadtium is an incorrect match for Unununnium.
Q95mcq
Reaction between benzaldehyde and acetophenone in presence of dilute NaOH is known as
a.
Cross Cannizzaro's reaction
b.
Cross Aldol condensation
Correct Answer
c.
Aldol condensation
d.
Cannizzaro's reaction
Step-by-Step AI Explanation
Verified Method
When two different carbonyl compounds (here benzaldehyde — no α-H, and acetophenone — has α-H) react in the presence of dilute NaOH, it is called a Cross Aldol condensation. Cannizzaro's reaction involves disproportionation of aldehydes with no α-H, not applicable here since acetophenone has α-hydrogens.
Q96mcq
Which one of the following has maximum number of atoms?
(1) 1 g of O₂(g) [Atomic mass of O = 16]
(2) 1 g of Li(s) [Atomic mass of Li = 7]
(3) 1 g of Ag(s) [Atomic mass of Ag = 108]
(4) 1 g of Mg(s) [Atomic mass of Mg = 24]
a.
1 g of O₂(g) [Atomic mass of O = 16]
b.
1 g of Li(s) [Atomic mass of Li = 7]
Correct Answer
c.
1 g of Ag(s) [Atomic mass of Ag = 108]
d.
1 g of Mg(s) [Atomic mass of Mg = 24]
Step-by-Step AI Explanation
Verified Method
Number of atoms: O₂: (1/32) × 2 × Nₐ = 0.0625 Nₐ; Li: (1/7) × Nₐ ≈ 0.143 Nₐ; Ag: (1/108) × Nₐ ≈ 0.00926 Nₐ; Mg: (1/24) × Nₐ ≈ 0.0417 Nₐ. Li has the maximum number of atoms.
Q97mcq
Anisole on cleavage with HI gives
a.
Phenol + C₂H₅I
b.
Iodobenzene + C₂H₅OH
c.
Phenol + CH₃I
Correct Answer
d.
Iodobenzene + CH₃OH
Step-by-Step AI Explanation
Verified Method
Anisole (methoxybenzene, C₆H₅–O–CH₃) on cleavage with HI undergoes nucleophilic attack preferentially at the methyl group (less hindered alkyl–oxygen bond) rather than at the aryl–oxygen bond (aryl–O bond is stronger). This produces phenol (C₆H₅OH) and methyl iodide (CH₃I).
Q98mcq
Which of the following amine will give the carbylamine test?
The carbylamine (isocyanide) test is given only by primary amines (both aliphatic and aromatic). When heated with chloroform and alcoholic KOH, primary amines form isocyanides (carbylamines) with a foul smell. Aniline is a primary aromatic amine and will give a positive carbylamine test. Secondary and tertiary amines do not give this test.
Q99mcq
Identify the incorrect statement.
a.
Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.
b.
The oxidation states of chromium in CrO₄²⁻ and Cr₂O₇²⁻ are not the same.
Correct Answer
c.
Cr²⁺ (d⁴) is a stronger reducing agent than Fe²⁺ (d⁶) in water.
d.
The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.
Step-by-Step AI Explanation
Verified Method
In CrO₄²⁻: let Cr = x; x + 4(–2) = –2 → x = +6. In Cr₂O₇²⁻: 2x + 7(–2) = –2 → x = +6. Both have Cr in +6 oxidation state. So the statement that they are 'not the same' is INCORRECT. All other statements are correct.
Q100mcq
Which of the following is a basic amino acid?
a.
Tyrosine
b.
Lysine
Correct Answer
c.
Serine
d.
Alanine
Step-by-Step AI Explanation
Verified Method
Lysine contains two amino groups (–NH2) and one carboxyl group, making it a basic amino acid. Tyrosine and Serine are polar neutral amino acids, and Alanine is a non-polar neutral amino acid.
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Match the following and identify the correct option.
(a) CO(g) + H₂(g)
(b) Temporary hardness of water
(c) B₂H₆
(d) H₂O₂
(i) Mg(HCO₃)₂ + Ca(HCO₃)₂
(ii) An electron deficient hydride
(iii) Synthesis gas
(iv) Non-planar structure
a.
(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
b.
(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
c.
(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)
d.
(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
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Match the following and identify the correct option.
(a) CO(g) + H₂(g)
(b) Temporary hardness of water
(c) B₂H₆
(d) H₂O₂
(i) Mg(HCO₃)₂ + Ca(HCO₃)₂
(ii) An electron deficient hydride
(iii) Synthesis gas
(iv) Non-planar structure
a.
(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
b.
(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
c.
(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)
d.
(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
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The freezing point depression constant (Kf) of benzene is 5.12 K kg mol⁻¹. The freezing point depression for the solution of molality 0.078 m containing a non-electrolyte solute in benzene is (rounded off up to two decimal places):
a.
0.40 K
b.
0.60 K
c.
0.20 K
d.
0.80 K
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Hydrolysis of sucrose is given by the following reaction:
Sucrose + H₂O ⇌ Glucose + Fructose
If the equilibrium constant (Kc) is 2 × 10¹³ at 300 K, the value of ΔrG° at the same temperature will be:
a.
8.314 J mol⁻¹ K⁻¹ × 300 K × ln(3 × 10¹³)
b.
–8.314 J mol⁻¹ K⁻¹ × 300 K × ln(4 × 10¹³)
c.
–8.314 J mol⁻¹ K⁻¹ × 300 K × ln(2 × 10¹³)
d.
8.314 J mol⁻¹ K⁻¹ × 300 K × ln(2 × 10¹³)
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Hydrolysis of sucrose is given by the following reaction.
Sucrose + H₂O → Glucose + Fructose
If the equilibrium constant (K_C) is 2 × 10¹³ at 300 K, the value of ΔrG° at the same temperature will be:
a.
8.314 J mol⁻¹ K⁻¹ × 300 K × ln(3 × 10¹³)
b.
–8.314 J mol⁻¹ K⁻¹ × 300 K × ln(4 × 10¹³)
c.
–8.314 J mol⁻¹ K⁻¹ × 300 K × ln(2 × 10¹³)
d.
8.314 J mol⁻¹ K⁻¹ × 300 K × ln(2 × 10¹³)
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Match the following:
Oxide — Nature
(a) CO — (i) Basic
(b) BaO — (ii) Neutral
(c) Al₂O₃ — (iii) Acidic
(d) Cl₂O₇ — (iv) Amphoteric
Which of the following is the correct option?
a.
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
b.
(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
c.
(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
d.
(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
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Match the following:
Oxide — Nature
(a) CO — (i) Basic
(b) BaO — (ii) Neutral
(c) Al₂O₃ — (iii) Acidic
(d) Cl₂O₇ — (iv) Amphoteric
Which of the following is the correct option?
(a) (b) (c) (d)
a.
(iii) (iv) (i) (ii)
b.
(iv) (iii) (ii) (i)
c.
(i) (ii) (iii) (iv)
d.
(ii) (i) (iv) (iii)
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Urea reacts with water to form A which will decompose to form B. B when passed through Cu²⁺ (aq), deep blue colour solution C is formed. What is the formula of C from the following?
a.
Cu(OH)₂
b.
CuCO₃·Cu(OH)₂
c.
CuSO₄
d.
[Cu(NH₃)₄]²⁺
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Identify the correct statements from the following:
(a) CO₂(g) is used as refrigerant for ice-cream and frozen food.
(b) The structure of C₆₀ contains twelve six carbon rings and twenty five carbon rings.
(c) ZSM-5, a type of zeolite, is used to convert alcohols into gasoline.
(d) CO is colourless and odourless gas.
a.
(b) and (c) only
b.
(c) and (d) only
c.
(a), (b) and (c) only
d.
(a) and (c) only
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The following metal ion activates many enzymes, participates in the oxidation of glucose to produce ATP and with Na, is responsible for the transmission of nerve signals.
a.
Calcium
b.
Potassium
c.
Iron
d.
Copper
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