Class XI

Formula Al(NO3)3 indicates that
  1. Three molecules of aluminum are combined with three molecules of Nitrogen oxide
  2. Three molecules of aluminum are combined with three molecules of Nitrate ion
  3. One molecules of aluminum is combined with three molecules of Nitrate ion one molecules of aluminum is combined with three molecules of Nitrate ion
  4. Al is a non-metal
 Proton number of Fluorine (F) is 9, electron number is
  1. 2,5
  2. 2,7
  3. 2,9
  4. 2,6
PH of soil can be controlled through
  1. Acid rains
  2. Hydrolases
  3. Reversible reactions
  4. Neutralization
Sublimation, dissolving and filtration can only be carried out in
  1. Soluble-substances in solution
  2. Insoluble substances in liquids
  3. Liquid-liquid mixtures
  4. Solid-solid mixtures
Crystals refers to
  1. A solid that can be dissolved in liquids
  2. A solid that re appears from other substances
  3. A solid that reappears from solution
  4. Can be obtained through sublimation
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