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GATE CY 2020 Question Paper (01-Feb-2020) (Shift 2)

Medium 65 Questions 180 min 100 marks

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Question No: 21Difficulty: mediumMarks: 1mcq

Among the following species, the one that has pentagonal shape is: (Given: atomic numbers of O, F, S, and Xe are 8, 9, 16, 53 and 54, respectively)

Question No: 22Difficulty: mediumMarks: 1mcq

A solution containing a metal complex absorbs at 480 nm with a 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:

Question No: 23Difficulty: mediumMarks: 1mcq

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

Question No: 24Difficulty: mediumMarks: 1mcq

The activity of ‘m’ molal CuSO₄, solution can be expressed in terms of its mean activity coefficient (γ_{\pm}) as:

Question No: 25Difficulty: mediumMarks: 1mcq

The character table for a pyramidal AB₃ molecule of C₃ᵥ point group is given below: C₃ᵥ E 2C₃ 3σᵥ A₁ 111 z x² + y² + z² A₂ 11 -1 R_{z} E 2 -1 0 (x, y)(Rₓ, R_{y}) (x² - y², xy)(xz, yz) The reducible representation of pyramidal AB₃ is C₃ᵥ E 2C₃ 3σᵥ Γ 1202 The CORRECT option representing all the normal Raman active modes of pyramidal AB₃ is:

C₃ᵥ	E	2C₃	3σᵥ
Γ	12	0	2

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