WorksheetspH Electrode
Total questions: 20
Worksheet time: 10mins
pH meters can be considered as voltage sources with which of the following internal resistances?
a)Very low resistance
b) Moderate resistance
c) Very high resistance
d) No resistance
Which of the following is not a failure in pH meters?
a) Defective electrodes
b) Defective input circuitry
c) Defective electronic circuitry
d) Defective calibration
Which of the following is the simplest of pH meters?
a) Null-detector type pH meter
b) Direct reading type pH meter
c) Digital pH meter
d) Modern pH meter
Pure water is known to be which of the following?
a) Weak electrolyte
b) Strong electrolyte
c) Neither weak nor strong
d) Not an electrolyte
Which of the following is the formula for pH calculation?
a) log10[H+]
b) -log10[H+]
c) log2[H+]
d) -log2[H+]
The Nernst equation is given by which of the following statements?
a) E=Eo + 2.303 RT/F log CH
b) E=Eo – 2.303 RT/F log CH
c) E=Eo + 2.303 RT×F log CH
d) E=Eo – 2.303 RT×F log CH
Why is Standard hydrogen electrode called as the primary reference electrode?
a) It has a known output potential
b) It has a constant output potential
c) Its output potential is independent of the composition of the solution
d) Its output potential is zero volts
In Hydrogen electrode, the electrode is placed in a solution of ____ M Hcl. Fill in the blank.
0.5
1
2
3
Given below is a diagram of hydrogen electrode. Identify the unmarked component.
a)Hydrogen at 1 atm
b) Hydrogen at 10 atm
c) Helium at 1 atm
d) Helium at 10 atm
In liquid membrane electrode, the liquid ion exchanger is held in a porous disc of _____________
a) Solid material
b) Semi-permeable membrane
c) Hydrophobic material
d) Water absorbing material
In glass membrane electrode, the glass containing 11% Na2O, 18% Al2O3, 71% SiO2 is highly sensitive to which of the following ions?
a) Sodium
b) Hydrogen
c) Chlorine
d) Nitrogen
In solid state membranes, the body of the electrodes are made of which of the following?
a) Polyvinyl chloride
b) Plastic
c) Polythene
d) Teflon
Given below is the diagram of liquid membrane electrode. Identify the unmarked component
a) Solid material
b) Semi-permeable membrane
c) Water absorbing material
d) Hydrophobic material
Which of the following principles are used in silica analyser?
a) Amperometric principle
b) Colorimetric principle
c) Coulometric principle
d) Magnetic principle
Which of the following is not added to the sample during analysis during silica analysis?
a) Ammonium Molybdate
b) Sulphuric acid
c) Reducing solution
d) Iodine solution
Which of the following are added for pH adjustment in sodium analyser?
a) Acid Solution
b) Basic Solution
c) Hydrazine
d) Ammonia Buffer
Which of the following indicate leakages in a condenser?
a) The concentration of sodium in steam and condensate are very high
b) The concentration of sodium in steam and condensate are equal
c) The concentration of sodium in steam and condensate are very low
d) The concentration of sodium in steam and condensate are not equal
Which of the following are used to free bound ions or liberate bound ions?
a) Colouring agents
b) Ammonia Buffer
c) Reagents
d) Iodine solution
In dissolved oxygen analyser, the electrometer consists of which of the following solutions?
a) Calcium hydroxide solution
b) Magnesium hydroxide solution
c) Potassium hydroxide solution
d) Calcium oxide solution
Oxygen content can be controlled by adding which of the following materials with water?
a)amino acid
b) KOH
c) Iodine Solution
d) Hydrazine
