GATE XL discipline:life-sciences PYQs & Answers — Page 15

Questions 141–150 of 1235. Imported answers require independent review unless marked reviewed.

Consider the two

values of valine as 2.32 and 9.62. The isoelectric point (pI) of this amino acid is _____. (rounded off to two decimal places)

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A few species are given in Column I. Column II contains the hybrid orbitals used by the central atom of the species for bonding.

The CORRECT match for the species to their central atom hybridization is

(Given: Atomic numbers of B: 5; C: 6; O: 8; F: 9; P: 15; Cl: 17; I: 53)

Column I — Species: i. I₃⁻; ii. PCl₃; iii. BF₃; iv. CO₂

Column II — Hybrid orbitals used by the central atom for bonding: a. sp; b. sp²; c. sp³; d. sp³d

Your answerChoose one option.

i–d, ii–c, iii–b, iv–a

i–a, ii–d, iii–b, iv–c

i–d, ii–c, iii–a, iv–b

i–d, ii–b, iii–c, iv–a

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For product formation from only one type of reactant (e.g. A → product), the CORRECT match for the order of the reaction (given in Column I) with the half-life expression (given in Column II) is

([A]₀ is the initial concentration and kᵣ is the rate constant)

Column I: Order	Column II: Half-life expression
i. Zero	P. ln 2 / kᵣ
ii. First	Q. [A]₀ / 2kᵣ
iii. Second	R. 1 / kᵣ[A]₀
	S. 2kᵣ / [A]₀

Your answerChoose one option.

i–R, ii–P, iii–S

i–Q, ii–P, iii–R

i–S, ii–R, iii–Q

i–Q, ii–P, iii–S

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The CORRECT statement(s) for the given reactions is(are)

Reactions:

I) Me–CH(Me)–CHO + i) MeMgBr; ii) H₃O⁺ →

II) MeCHO + i) ⁱPrMgBr; ii) H₃O⁺ →

III) Me–CH(Me)–CO₂Me + i) MeMgBr (excess); ii) H₃O⁺ →

IV) Me₂CO + i) ⁱPrMgBr; ii) H₃O⁺ →

Possible products: P: Me–C(OH)(Me)–CH₂Me Q: Me–C(OH)(Me)–CH(Me)₂ R: Me–CH(Me)–CO₂Me

Your answerSelect all correct options. You can choose more than one.

P is formed as the major product in reaction I.

P is formed as the major product in reaction II.

Q is formed as the major product in reaction IV.

R is formed as the major product in reaction III.

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Addition of a few drops of concentrated HCl to an aqueous solution of CoCl₂ forms a dark blue complex X.

The CORRECT statement(s) for this reaction is(are)

(Given: Atomic number of Co: 27)

Your answerSelect all correct options. You can choose more than one.

X is a centrosymmetric complex.

The oxidation state of cobalt does not change in this reaction.

The number of unpaired electrons on cobalt in X and in CoCl₂ (aqueous solution) are the same.

The spin only magnetic moment value for X is 3.87 BM.

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The CORRECT statement(s) regarding biomolecules is(are)

Your answerSelect all correct options. You can choose more than one.

The N-terminal amino acid of a polypeptide can be identified by Edman’s reagent (phenyl isothiocyanate).

L-Threonine has only one chiral center.

Cytosine is present both in RNA and DNA.

A mixture of different amino acids can be separated by ion-exchange chromatography.

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Energy of the transition from

for hydrogen atom is E × 10³ cm⁻¹.

Given: Rydberg constant for hydrogen: 1.097 × 10⁷ m⁻¹.

Value of E is _____________. (rounded off to two decimal places)

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A non-volatile solute has a molecular weight of 180 g mol⁻¹. Assume that the solute does not associate or dissociate and the boiling-point constant (ebullioscopic constant) of water is 0.51 K kg mol⁻¹.

The amount (in g) of solute added to 500 g of water to elevate the boiling point by 0.153 K is ______ (answer in integer)

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The standard potentials (E⁰) for the Fe³⁺/Fe and Fe³⁺/Fe²⁺ couples are −0.04 V and +0.76 V, respectively.

Given: Faraday constant = 96500 C mol⁻¹.

The value for E⁰ (Fe²⁺/Fe), in V, is _____________. (rounded off to two decimal places)

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Zinc is essential for the function of

Your answerChoose one option.

carboxypeptidase A.

chlorophyll a.

myoglobin.

vitamin B₁₂.

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GATE XL discipline:life-sciences PYQs

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