Analytical Chemistry Mid - II, November - 2014

1.The Complexometric determination of hardness by EDTA involves the colour changes at endpoint from ______ to __________
  • Colourless to clear blue
  • Blue to wine red colour
  • Wine red to clear blue
  • Wine red to colourless
Answer: C
2.Alkalinity in water cannot be due to the presence of
  • OH only
  • CO32 and HCO3
  • OH and CO32
  • OH and HCO3
Answer: D
3.A water sample can be regarded as soft water, if it contains hardness in between
  • 120-180
  • 60-120
  • 0-20
  • 20-60
Answer: C
4.Dissolved Oxygen in water can be determined by
  • Iodometric method
  • Electrometric method
  • both
  • None
Answer: C
5.Electron capture detector is based upon __________
  • Electron affinity
  • Proton affinity
  • Both
  • None
Answer: A
6.Which of the following does not affect the Rf value in TLC
  • Thickness of the adsorbent
  • Thickness of the chromoplate
  • Chamber saturation
  • Quality of adsorbent
Answer: B
7.In partition paper chromatography the stationary phase is ___________.
  • Benzene
  • Water
  • DCM
  • Toluene
Answer: B
8.Thermal analysis is a technique used to measure
  • Specific heat
  • Lartent heat
  • Both
  • None
Answer: C
9.The compounds of the following are used as reference material for the analysis of inorganic compounds in DTA technique
  • Carborundum
  • Alumina
  • Megnesium oxide
  • All
Answer: D
10.ID is mainly based on
  • Electrical conductivity of gas
  • Solubility of the gas
  • Temperature of the gas
  • All
Answer: A
11.The presence of chloride ions in the water can be determined by ____________ method
Answer: Argentometric
12.If the alkalinity is P=M, it indicates the presence of ___________ ions
Answer: Hydroxide
13.The amount of oxygen required by oxidizable matter in the water sample is given by _________ test
Answer: COD
14.Temporary hardness of water can be removed by____________
Answer: Boiling
15.Rf values are calculated immediately after the spots are visualized because of ______________
Answer: Possibility of fading
16.The stationery phase used in HPLC is____________
Answer: Alumin/Silicagel
17.The movement of the substance relative to the solvent front in a given chromatographic system is called _______________________
Answer: Rf
18.The columns preferred for trace analysis are____________
Answer: Supportcoated tubular
19.____________is a technique in which change in the weight of a substance is recorded as a function of temperature or Time
Answer: Thermogravimetry
20.__________ is used for weighing a sample continuously while it is being heated or cooled.
Answer: Thermobalance