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Spectroscopy Questions - All Grades

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Grade 12 Spectroscopy
In gravimetric analysis, how is the solubility of the precipitate reduced?
  1. By adding excess of precipitating reagent
  2. By adding minimum precipitating agent
  3. By increasing the concentration of analyte
  4. By decreasing the concentration of analyte
Grade 12 Spectroscopy
Which electromagnetic radiation is absorbed to bring about electronic transitions in a molecule?
  1. UV-visible rays
  2. X rays
  3. Gamma rays
  4. Infrared rays
Grade 12 Spectroscopy
Which concentration range defines the sensitivity of UV-Visible spectroscopy when it is used for qualitative and quantitative analysis of compounds?
  1. [math]10^-7 to 10^-2 M[/math]
  2. [math]10^-5 to 10^-3 M[/math]
  3. [math]10^-4 to 10^-1 M[/math]
  4. [math]10^-6 to 10^-5 M[/math]
Grade 12 Spectroscopy
In which of the following temperature ranges is the solubility of AgCl increased by approximately 12 times?
  1. [math]283 K - 373 K[/math]
  2. [math]290 K - 390 K[/math]
  3. [math]300 K - 350 K[/math]
  4. [math]200 K -250 K[/math]
Grade 12 Spectroscopy
What is the temperature range for ignition during gravimetric analysis?
  1. [math]250degC - 1200degC[/math]
  2. [math]200 degC - 1000 degC[/math]
  3. [math]150 degC - 500 degC[/math]
  4. [math]100 degC - 350 deg C[/math]
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