Inorganic Chemistry

CSIR NET Chemical Science — Analytical and Instrumental Methods previous year questions

20 questions · 2011–2019 · all with verified answer · last checked 2026-11-06

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Analytical and Instrumental Methods full PYQ deck (PDF, 2026 edition)

Q1 · Dec 2019 · 2 marks

In spectrofluorimetric determination in solution

(a) absorbance of analyte solution is kept near to 0.05
(b) oxygen is eradicated from solution
(c) pH of solution is controlled
(d) wavelength of incident light is always above 400 nm Correct from the above is (1)A, B and D (2)B, C and D (3)A, B and C (4)A, C and D

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Answer: (c)

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Q2 · Dec 2019 · 2 marks

The pair of light source and atomizer resulting highest sensitivity to atomic absorption spectrometric measurement is:

(a) Hg lamp, nitric oxide flame
(b) Hg lamp, graphite furnace
(c) Hollow cathode lamp, graphite furnace
(d) Hollow cathode lamp; acetylene-nitric oxide flame

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Answer: (c)

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Q3 · Dec 2019 · 2 marks

Inspectrofluorimetric determination in solution

(a) absorbance of analyte solution is kept near to 0.05 A, B and D
(b) oxygen is eradicated from solution B, C and D
(c) pH of solution is controlled A, B and C
(d) wavelength of incident light is always above 400 nm 1 A, C and D

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Answer: (c)

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Q4 · June 2019 · 2 marks

Incorrect statement for amperometric titration is

(a) it is based on measurement of diffusion current.
(b) its sensitivity is always higher than those of spectrophotometric titrations
(c) it does not generally require an indicator
(d) it requires inert atmosphere \left(\mathrm{N}_{2} / \mathrm{Ar}\right)

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Answer: (d)

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Q5 · June 2018 · 2 marks

Height equivalent to theoretical plate (HETP) in gas liquid chromatography depends Significantly on which of the following?

(a) Temperature of column A, B and C
(b) Velocity of carrier gas C and D
(c) Packing of column B, C and D
(d) Column material A and C

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Answer: (a)

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Q6 · Dec 2017 · 2 marks

To determine the bond parameters at 25°C, electron diffraction is generally unsuitable for both

(a) \mathrm{O}_{3} and \mathrm{NO}_{2}
(b) Sulfur and dry ice
(c) \mathrm{NO}_{2} and sulphur
(d) \mathrm{O}_{3} and dry ice

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Answer: (b)

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Q7 · Dec 2017 · 2 marks

The peak area of differential thermal analysis curve is proportional to one or more of the following

(a) mass loss
(b) mass of the sample
(c) heat of decomposition / phase change

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Answer: (d)

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Q8 · June 2017 · 2 marks

Identify the correct statement(s) for phosphorimetric measurement from the following:

(a) It is done after a time delay when fluorescence, if present becomes negligible A only
(b) Immobilization of analyte increases phosphorescence. A and B
(c) Phosphorescence decreases in the presence of heavy atoms A and C
(d) Band C

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Answer: (b)

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Q9 · June 2017 · 2 marks

Identify correct statements from the following:

(a) Area of differential thermal analysis peak is proportional to amount of sample. A, B and C
(b) Area of differential thermogravimetric analysis curve is proportional to mass loss. A, B and D
(c) Phase transition cannot be studied , with differential scanning calorimetry. B, C and D
(d) Simultaneous determination of two metal ions is possible with thermogravimetric analysis. A, C and D

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Answer: (b)

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Q10 · Dec 2016 · 2 marks

The primary analytical method (not using a reference) is:

(a) inductively coupled plasma emission spectrometry 3
(c) anodic stripping voltammetry
(d) isotopic dilution mass spectrometry

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Answer: (d)

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Q11 · June 2016 · 2 marks

Decomposition temperature of \mathrm{CaCO}_{3} in thermogravimetric analysis will be highest in dynamic atmosphere of:

(a) nitrogen
(b) synthesis gas
(c) 1: 1 mixture of \mathrm{O}_{2} and CO
(d) water gas.

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Answer: (c)

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Q12 · June 2015 · 2 marks

The pair of light source and atomizer resulting highest sensitivity to atomic absorption spectrometric measurement is: (1) Hg lamp, nitric oxide flame (2) Hg lamp, graphite furnace (3) Hollow cathode lamp, graphite furnace (4)Hollow cathode lamp; acetylene-nitric oxide flame

(a) 1 and 2
(b) 2 and 3
(c) 1 and 3
(d) 3 only

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Answer: (c)

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Q13 · Dec 2015 · 2 marks

Correct statement for coulometry is

(a) it is based on Faraday's law of electrolysis
(b) It is a type of voltammetry
(c) it is based on Ohm's law
(d) it uses ion selective electrode

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Answer: (a)

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Q14 · Dec 2015 · 2 marks

The calibration curve in spectrofluorimetric analysis becomes non-linear when

(a) molecular weight of analyte is high
(b) intensity of light source is high
(c) concentration of analyte is high
(d) molar absorptivity of analyte is high

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Answer: (a)

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Q15 · Dec 2014 · 2 marks

The gas commonly used in generating plasma in Inductively Coupled Plasma Atomic Emission Spectroscopy (ICPAES) is:

(a) Argon
(b) Carbon dioxide
(c) Nitrous oxide
(d) hydrogen

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Answer: (a)

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Q16 · June 2014 · 2 marks

The use of dynamic inert atmosphere in thermogravimetric analysis (TGA): (1) decreases decomposition temperature (2) decrease weight loss (3) reduces rate of decomposition (4) increases weight loss

(a) decreases decomposition temperature
(b) decrease weight loss
(c) reduces rate of decomposition
(d) increases weight loss

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Answer: (d)

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Q17 · Dec 2014 · 2 marks

The gas commonly used in generating plasma in Inductively Coupled Plasma Atomic Emission Spectroscopy (ICPAES) is:

(a) Argon
(b) Carbon dioxide
(c) Nitrous oxide
(d) hydrogen

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Answer: (a)

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Q18 · June 2014 · 2 marks

The use of dynamic inert atmosphere in thermogravimetric analysis (TGA):

(a) decreases decomposition temperature
(b) decrease weight loss
(c) reduces rate of decomposition
(d) increases weight loss

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Answer: (d)

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Q19 · June 2014 · 2 marks

The correct statements for hollow cathode lamp (HCL) from the following are:

(a) HCL is suitable for atomic absorption spectroscopy (AAS)
(b) lines emitted from HCL are very narrow
(c) the hardening of lamp makes it unsuitable for AAS
(d) transition elements used in lamps have short life (1) A, B and C (2) B, C and D (3) C, D and A (4) D, A and B

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Answer: (a)

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Q20 · 2011-2020 · 2 marks

Thermometric titration gives best results when

(a) |\Delta H| is high
(b) \boldsymbol{\Delta} \mathbf{G}<\mathbf{0}
(c) Heat of mixing of titrant with titrant is high
(d) Titrant is used as dilute solution The answer is

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Answer: (a)

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