Module 3- Instrumental Method of analysis & Energy Systems

An electrode whose potential depends on the concentration of ions to be determined, is called as_____

• Reference electrode

• Indicator electrode

• Gas electrode

• None of the above

________ wavelength shows maximum absorption for cuprammonium sulfate complex in the colorimetric estimation of Copper.

• 620 nm

• 640 nm

• 680 nm

• 520 nm

Write the unlabeled component of Colorimeter

• Electrode

• Cuvette

• Recorder

Nature of the curve for the conductometric titration of weak acid versus strong base is

• Option A

• Option B

• Option C

• Option D

Photovoltaics cells are _____ devices thar convert sunlight into direct current electricity.

• Metal

• Insulator

• Semiconductor

• None of the above

Addition of base beyond the neutralization point leads to increase in the more mobile___ ions and hence conductance___ in the conductometry titration.

• Na⁺, increases

• Na⁺, decreases

• OH^-, decreases

• OH^-, increases

According to Beer’s law intensity of the _________ light decreases exponentially as the ________ of the media increases arithmetically.

• Absorbing, concentration

• Absorbing, path length

• transmitted, concentration

• transmitted, path length

According to Lambert's law intensity of the transmitted light _________ exponentially as the ________ of the media increases.

• decreases, concentration

• increases, concentration

• decreases, pathlength

• increases, pathlength

Instrument which is used to determine the amount of Iron in a sample is

__________

• Conductometry

• Potentiometry

• Colorimetry

• Calorimetry

Electrodes used in the potentiometry

• Indicator electrode- Platinum electrode(anode) Reference electrode-Calomel electrode (cathode)

• Two platinum electrodes kept at a distance of one centimeter apa

• One platinum electrode

• Two calomel electrodes