Question # 1

The concentration required to give a signal equal to three times the standard deviation of the baseline is called.

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Sensitivity

Detection limit

Signal to noise ratio

None of the above

The exchange equilibrium in gas chromatography depends on.

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Solubility or absorbability of he sample

The polarity of he stationary phase and analyte

The degree of H bonding

All above factors

The number 8.47 is rounded to

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8.5

8.4

8.7

8.6

The absorbance is directly proportional to the path length in the flame and to the concentration of atomic vapor in flame is a statement of.

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Lambert's law

Beer's law

Honery's law

Starke law

Amino acids are are important in biochemistry which of the following statements is not correct regarding amino acids.

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These are amphoteric substances tend to undergo internal protein transfer

In aqueous solutions these substances tend to undergo internal proton transfer

These for zwitter ion in aqueous medium

These always contain two amino groups.

Which of the following methods is the most common method for separation of liquid components from a mixture.

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Dialysis

Solvent extraction

Precipitation

Distillation

A trace constituent is one whose amount in the sample is.

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< 10%

< 010%

< 1.0%

< 0.01 %

Which of the following methods is used in qualitativ eanalysis.

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Physical method

Chemical method

Instrumental method

All above

Deviation in a particular measurement is the difference between the measured value and the average value The arithmetic mean of the different deviations observed in several measurements of the same quantity is known as.

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The standard deviation

The average deviation

Relative mean deviation

variance

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

Which of the following technique is the application of voltammetry at a fixed potential to detect changes int he currents as a function of the concentrating of the analyte

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Amperometry

Coulometry

Polarography

Potentiomertry

Which of the following analytical technique is based on the emission of light radiation.

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Flame photometry

Atomic absorption spectrophotometry

Raman spectroscopy

Conductometry

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

Yellow colour of the flame is observed with

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Calcium salt

Barium salt

Sodium salt

Potassium salt

Which of the following technique is used for separation of volatile components.

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GC

HPLC

FPLC

TLC

Which of the following technique describes titrations in which a standard iodine solution is need.

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Iodometry

Iodimetry

potentiometry

Argentometry

The oxidation number of Mn in KMnO4

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+5

+7

+4

+3

Which of the following technique is used to separate substance based on their charge to mass ratio.

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HPLC

HPTLC

GC

Electrophoresis

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