GATE CY topic:instrumental-methods-analysis PYQs & Answers — Page 2

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Questions 11–17 of 17. Imported answers require independent review unless marked reviewed.

Topic practice 17 questionsPage 2 of 2

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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The CORRECT ‘voltage (E) versus time’ excitation signal used in cyclic voltammetry is

Your answerChoose one option.

Diagram for Chemistry question 40 (figure 2)

Diagram for Chemistry question 40 (figure 3)

Diagram for Chemistry question 40 (figure 4)

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The total number of

lines expected in the EPR spectrum of a solution of bis(salicylaldimine) copper(II) having pure

Cu and

N at 77 K is ______

(Given: I values of

Cu,

N and

H are

, 1 and

, respectively)

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On heating a sample of 25 mg hydrated compound (molecular weight = 250 g/mol) in thermogravimetric analysis, 16 mg of dehydrated compound remains. The number of water molecules lost per molecule of hydrated compound is ____________. (Molecular weight of water = 18 g/mol)

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In the EPR spectrum of a methyl radical, the number of lines and their relative intensities, respectively, are

Your answerChoose one option.

1 and 1

3 and 1:2:1

4 and 1:2:2:1

4 and 1:3:3:1

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The characteristic feature of an electron spin resonance (ESR) spectrum of frozen aqueous solution of CuSO

·5H

O at 77 K is

Your answerChoose one option.

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The diffusion limiting current (

) at a dropping mercury electrode for an aqueous Mg(II) solution of concentration ‘c’ (mol L

) is 300 μA. If ‘c’ is increased by 0.1 mol L

increases to 900 μA. The value of ‘c’ (in mol L

) is ______ (up to two decimal places).

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GATE CY topic:instrumental-methods-analysis PYQs

Question 12

Question 40

Question 47

Question 18

Question 29

Question 16

Question 45