Class XI

In the process of obtaining pure de-mineralised water is passed initially through cation exchange, This makes the water
  1. remain unchanged
  2. neutral
  3. basic
  4. acidic
Presence of extensive hydrogen bonding between water molecules is responsible for
  1. solid and vapour states
  2. vapour states
  3. liquid and solid states
  4. liquid and vapour states
An ice cube floats on water because
  1. Density of ice is zero
  2. Density of ice is more than that of water
  3. Density of ice is less than that of water
  4. Density of ice is equal to that of water
The three isotopes of hydrogen in terms of chemical properties show one of the following properties
  1. difference is in their rates of reactions
  2. same rates of reactions because of the same enthalpy of bond dissociation
  3. same rates of reactions because of the same electronic configuration
  4. same rates of reactions because of the same mass
Hydrogen is unique in behaviour because of its
  1. extremely small atomic size
  2. low reactivity
  3. high ionization enthalpy
  4. nonmetallic characteristic
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