GATE CY year:2021 PYQs & Answers — Page 6

Questions 51–60 of 65. Imported answers require independent review unless marked reviewed.

The correct order of Lewis acid strengths of BF₂Cl, BFClBr, BF₂Br and BBr₂ is:

Your answerChoose one option.

BF₂Cl > BFClBr > BF₂Br > BBr₂

BBr₂ > BFClBr > BF₂Br > BF₂Cl

BF₂Cl > BF₂Br > BFClBr > BBr₂

BFClBr > BBr₂ > BF₂Cl > BF₂Br

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The correct order of increasing intensity (molar absorptivity) of the UV-visible absorption bands for the ions [Ti(H₂O)₆]³⁺, [Mn(H₂O)₆]²⁺, [CrO₄]²⁻, and [NiCl₄]²⁻ is:

Your answerChoose one option.

[Ti(H₂O)₆]³⁺ < [Mn(H₂O)₆]²⁺ < [CrO₄]²⁻ < [NiCl₄]²⁻

[Mn(H₂O)₆]²⁺ < [Ti(H₂O)₆]³⁺ < [NiCl₄]²⁻ < [CrO₄]²⁻

[NiCl₄]²⁻ < [Ti(H₂O)₆]³⁺ < [Mn(H₂O)₆]²⁺ < [CrO₄]²⁻

[Ti(H₂O)₆]³⁺ < [NiCl₄]²⁻ < [CrO₄]²⁻ < [Mn(H₂O)₆]²⁺

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The correct statement(s) about the concentration of Na⁺ and K⁺ ions in animal cells is/are:

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

[K⁺] inside the cell > [K⁺] outside the cell

[Na⁺] inside the cell > [Na⁺] outside the cell

[Na⁺] inside the cell < [Na⁺] outside the cell

[K⁺] inside the cell < [K⁺] outside the cell

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The correct statement(s) about actinides is/are:

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

The 5f electrons of actinides are bound less tightly than the 4f electrons.

The trans uranium elements are prepared artificially.

All the actinides are radioactive.

Actinides do not exhibit actinide contraction.

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The number of photons emitted per nanosecond by a deuterium lamp (400 nm) having a power of 1 microwatt (rounded off to the nearest integer) is ______. [h = 6.626 × 10⁻³⁴ kg m² s⁻¹; c = 3.0 × 10⁸ m s⁻¹]

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Given the initial weight of 1 mg of radioactive ⁶⁰₂₇Co (half-life = 5.27 years), the amount disintegrated in 1 year (rounded off to two decimal places) is ______ mg.

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The de Broglie wavelength of an argon atom (mass = 40 amu) traveling at a speed of 250 m s⁻¹ (rounded off to one decimal place) is ________ picometers. [N = 6.022 × 10²³; h = 6.626 × 10⁻³⁴ kg m² s⁻¹]

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The molar absorption coefficient of a substance dissolved in cyclohexane is 170 L mol⁻¹ cm⁻¹ at 500 nm. The reduction in intensity of light of the same wavelength that passes through a cell of 1 cm path length containing a 2 mol L⁻¹ solution (rounded off to one decimal place) is _________%.

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The fundamental vibrational frequency of ¹H¹²⁷I is 2309 cm⁻¹. The force constant for this molecule (rounded off to the nearest integer) is _____ N m⁻¹. [N = 6.022 × 10²³, c = 3.0 × 10⁸ m s⁻¹]

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A laser Raman spectrometer operating at 532 nm is used to record the vibrational spectrum of Cl₂ having its fundamental vibration at 560 cm⁻¹. The Stokes line corresponding to this vibration will be observed at ______ cm⁻¹. (Rounded off to the nearest integer)

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GATE CY year:2021 PYQs

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