Question # 1

Which of the following technique is based on the absorption of light radiation.

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Spectrophotomerty

Colorimetry

NMR

All the above technique

If the values of standrd deviations for the first and second method differ, then which of the following test helps one to know whether this difference is significant.

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Student's test

F-Test

Chi square test

Standard deviation

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 acid radical is not interfering.

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Phosphate

Borate

Flouride

Sulphate

Which of the following radical is a member of VI group.

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Mg²⁺

Na+

K+

NH₄⁺

All above

Which of the following functional groups is not involved in ion exchange chromatography.

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Weak acids

Strong acids

Strong bases

Carbohydrates

The titration involving oxidation reduction reactions is called.

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Complex titration

Simplex titration

Redox titration

Acid base titration

Which of the following method is used to separate small molecules form the larges molecules from the larger molecules in diffusing through a membrane.

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Dialysis

HPLC

FPLC

TLC

Potentiometry is based on the measurement of which physical property.

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Electrical conductance

Electrical potential

Thermal conductance

Current

Which of the following steps is involved in quantitative analysis.

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Sampling

Conversion of the desired constituent into a suitable form per analysis.

Measurement of some physical or chemicals property, on which the determination is based.

All above steps

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

When to a solution of weak electrolyte a strong electrolyte with a common ion is added, the dissociation of weak electrolytes is suppressed . This is known as.

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Stark effect

Salt effect

Common ion effect

Zeman effect

Which of the following steps is not involved in chemical analysis.

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Separation of sample in pure form

Separation of the sample in the mixture form

Preparation of sample for the analyisis

Validity of experimental results

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 property is used in volumetric methods of analysis.

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Density

Viscosity

Volume

Molar volume

Which of the following techniques involve gas as the mobile phase.

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HPLC

GLC

TLC

Paper chromatography

Which of the following substance is not weak electrolyte.

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CH3COOH

NH4OH

Oxalic Acid

NaCl

Which of the following element is usually determined by flame photometry.

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Li

Na

K

All above elements

Which of the following electrode is normally used as reference electrode for a potentiometer.

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Platinum electrode

Calomel electrrode

Silver electrode

Copper electrode

The process of identifying the component present in a sample is called.

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Quantitative analysis

Qualitative analysis

Volumetric analysis

Gravimetric analysis

Thermogravimetic analysis has application is which of the following fields

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Gravimetric analysis

Discovery of new methods ofseparation

Determination of purity and thermal stability

All above

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