GATE CY year:2020 PYQs & Answers — Page 3

Questions 21–30 of 65. Imported answers require independent review unless marked reviewed.

Topic practice 65 questionsPage 3 of 7

Among the following species, the one that has pentagonal shape is:

(Given: atomic numbers of O, F, S, I and Xe are 8, 9, 16, 53 and 54, respectively)

Your answerChoose one option.

XeOF₄

IF₅

[SF₅]⁻

[XeF₅]⁻

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A solution containing a metal complex absorbs at 480 nm with molar extinction coefficient of 15,000 L mol⁻¹ cm⁻¹. If the path length of the cell is 1.0 cm and transmittance is 20.5%, the concentration (in mol L⁻¹) of the metal complex is:

Your answerChoose one option.

1.37 × 10⁻⁵

2.29 × 10⁻⁵

4.59 × 10⁻⁵

8.75 × 10⁻⁵

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Among the following linear combination of atomic orbitals, the CORRECT representation of the lowest unoccupied π-molecular orbital of butadiene is:

Your answerChoose one option.

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The activity of ‘m’ molal CuSO₄ solution can be expressed in terms of its mean activity coefficient (γ±) as:

Your answerChoose one option.

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The character table for a pyramidal AB₃ molecule of C₃ᵥ point group is given below:

C₃ᵥ | E | 2C₃ | 3σᵥ | A₁ | 1 | 1 | 1 | z | x² + y², z² A₂ | 1 | 1 | −1 | Rz | E | 2 | −1 | 0 | (x,y) (Rx,Ry) | (x²−y², xy) (xz, yz)

The reducible representation of pyramidal AB₃ is

C₃ᵥ | E | 2C₃ | 3σᵥ Γ | 12 | 0 | 2

The CORRECT option representing all the normal Raman active modes of pyramidal AB₃ is:

Your answerChoose one option.

A₁ + A₂ + 2E

3A₁ + A₂ + E

2A₁ + 2E

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In the following reaction,

the number of peaks exhibited by the major product P in its broadband proton decoupled ¹³C NMR spectrum is ______

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Among the following,

the total number of aromatic species is ______

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The maximum number of microstates for

electronic configuration is ______

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In a uranium recovery process, an aqueous solution of uranyl ion is evaporated, dried in air at 400 °C and subsequently reduced with hydrogen at 700 °C to obtain a uranium compound (X). The oxidation state of uranium in X is ______

(Given: atomic number of U is 92)

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For a cubic crystal system, the powder X-ray diffraction pattern recorded using Cu K

source (

= 1.54 Å) shows a peak at 33.60° (

) for (111) plane. The lattice parameter ‘a’ (in Å, rounded off to two decimal places) is ______

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GATE CY year:2020 PYQs

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