Class XI

In Na2CO3.10H2O, percentage of Carbon is
  1. 0.4201
  2. 0.0422
  3. 0.042
  4. 0.46
Upon dissolving ionic substances or melting them,
  1. They become good conductor of electricity
  2. Crystal lattice gets destroyed
  3. They loose electrical conductivity
  4. Both A and B
Ability of dissolving animal fats is found in
  1. Solid carbon dioxide
  2. Liquid carbon dioxide
  3. Gaseous carbon dioxide
  4. All of these
A brine solution is
  1. Low in salts
  2. Concentrated in salts
  3. Highly concentrated in salts
  4. Contains a lot of water
Most metals react with acids to form
  1. Salt
  2. Hydrogen gas
  3. Alkalis
  4. Both A and B
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