Question # 1

Which of the following technique is based on deposition of the analyte at appropriate electrode by the passage of the electric current.

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Chromatography

Dialysis

Electrodeposition

Solvent extraction

The most widely used method of extracting metal ions is the formation of a chelate molecule with an organic chelating agent The chelating agents are.

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Strong acids

Strong bases

Weak bases

Weak acids

Which of the following quantity is correct for micro analysis.

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1 -10 mg or < 50 ml

10-20 mg or > 50 mL

50-100 mg or < 100 mL

None of above

It has been observed that if one goes on adding KNO3 solution to a precipitate of AgCl the solubility of these precipitates goes on increasing with increasing concentration of K+ and NO3= ions which are not common to AgCl This is due to which effect.

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Divers ion effect

Uncommon ion effect

Activity effect

All above

Which of the following technique is most sanative one.

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Photomerty

AAS

Flame photometry

Flourimetry

Yellow colour of the flame is observed with

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Calcium salt

Barium salt

Sodium salt

Potassium salt

Solid phase micro extraction is a solvent less extraction technique This technique is used for preparation of samples for analysis by which of the following technique.

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HPLC

GC

TLC

Electrophoreals

Which of the following anionic species is not separated by gravimetric analysis.

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Cl-

SO4

CH3COO-

PO4

Which of the following statements is not related with flame photometric analysis.

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Vaporization of the solvent leaving back the residue

Conversion of solid slat to the gaseous state

Dissociation of gaseous molecules into free atoms

Measurement of the intensity of absorbed tradition

Volta metric technique using a dropping mercury electrode is called.

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Amperometry

Coulometry

Polarography

Potentiometry

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

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< 10%

< 010%

< 1.0%

< 0.01 %

The process of determining amounts of each of the components in a sample of matter is termed as.

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Gravimetric analysis

Coulometric analysis

Quantitative analysis

Qualitative analysis

Which of the following is the best indicator for titration of NH4OH with HCl.

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Methyl red

Methyl orange

Eosin

Phenolphthalein

Which of the following factor is involved in band boarding that occur in column chromatography.

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Number of theoretical plates

Eddy diffusion

In phase mass transfer

All above

Which of the following devoice is used to measure potential difference between celctrodes.

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Polarimetre

Conductometer

Voltmeter

Photometer

Which of the following salt is green in colour

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Mn salt

Cr salt

Co salt

Ba salt

The term accuracy refers to how near the observed value is to.

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Mean value

Low value

True value

Standard value

Both C and D

Which of the following acid radical is not interfering.

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Phosphate

Borate

Flouride

Sulphate

The number 7.65 is rounded to.

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7.6

7.7

7.5

7.8

The plate height is the length of the column divide by

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Length of the column

Width of the column

Number of theoretical plates

Number of components of the mixture.

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