Class XI

First element in periodic table to have 8 valence electrons is
  1. Nitrogen
  2. Oxygen
  3. Fluorine
  4. Neon
Soda water (H2CO3(aq)) has a pH of
  1. 1
  2. 2
  3. 3
  4. 4
Chromatography is especially useful for
  1. Foods
  2. Drugs
  3. Salt solutions
  4. Both A and B
While plotting decrease in mass against time, a flat curve shows
  1. Fastest reaction
  2. Reaction is slower
  3. That reaction is over
  4. That reaction is endless
Consider equation Al2O3 + NaOH + H2O →NaAl(OH)4. Balancing of equation requires how many moles of NaOH?
  1. 1
  2. 2
  3. 3
  4. 4
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