Question # 1

Which of the following statements is not correct with respect to errors in flame photometry.

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Errors rising form the phenomena developed in the Hollow cathode lamp

Background effect

Errors arising from test element itself

Spectral interference

Which of the following technique is used to separate substance of high molecular weight of different charges.

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Dialysis

Electrophoresis

Solvent

None of the abvoe

Cobalt salt imparts which colour to the borax bead

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Blue

Green

Red

Yellow

Which of the following mixture is used as most popular flame in AAS.

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Acetylene air

Acetylene O2

Hydrogen air

Hydrogen O2

Yellow green flame is observed with

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Calcium salt

Barium salt

Strontium salt

Sodium salt

When HCl is titrated against NaOH , the pH at the equivalence point is.

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zero

> 7

< 7

14

The property measured in TGA is

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Change in weight

Rate of change in weight

Heat envolved and absorbed

Change of temperature.

Which of the following interaction is involved in solid phase extraction technique.

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Van der Waals forces

Dipolar attraction

H bonding

All of above

Which of the following detector is used in GC analysis

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Thermal conductivity detector

Flame ionization detector

Mass spectrometer

All above

The proper number of significant figures in the number 0.0780 is.

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3

1

4

2

Yellow colour of the flame is observed with

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Calcium salt

Barium salt

Sodium salt

Potassium salt

Which of the following is not an adsorption indicator.

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Eosin

Bromocrsol green

Fluorescein

Phenolphthalein

The number of significant figures in the number 0.216 is

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1

2

3

4

In TGA, the width loss curve depends on the which instrumental factors.

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Furance heating rate

Recording or chart speed

Furnace atmosphere

All

Which of the following methods is used in qualitativ eanalysis.

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Physical method

Chemical method

Instrumental method

All above

Which of the following method of analysis is based on diffraction of radiation.

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Mass spectrometry

Polarography

Potentiometry

Raman scattering

In normal mode of operations of liquid liquid partition, a polar stationary phase is used with a non polar mobile phase Which of the following solvent is used as mobile phase.

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Ethanol

Propanol

Butanol

Hexane

In reverse phase chromatography which of the analyte will be eluted more readily.

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Polar

Non polar

Semi polar

All above

In second group of inorganic qualitative analysis, the S^2-ions does not form precipitate with which of the following ions.

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^Hg2+

Cu²⁺

Ai³⁺

Cd³⁺

Which of the following acid radical is not interfering.

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Phosphate

Borate

Flouride

Sulphate

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