Class XI

In Copper Oxide (CuO) and Carbon Monoxide (CO) reaction, reducing agent is
  1. CuO
  2. CO
  3. Cu
  4. CO2
Chromatography can be used to
  1. Form mixtures
  2. Change mixture compositions
  3. Separate mixtures into pure substances
  4. All of these
 All are examples of radicals except
  1. Hydroxide
  2. Sulphate
  3. Ammonium
  4. Aluminum
 In Universal indicators, weak alkalis are indicated through
  1. Turquoise color
  2. Blue color
  3. Light violet color
  4. All of these
Phase that never gains in sublimation is
  1. Solid
  2. Liquid
  3. Gas
  4. Vapors
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