Class XI

 A mixture
  1. Is not a pure substance
  2. Is not formed through chemical reaction
  3. Is a pure substance
  4. Both A and B
 Exothermic reactions are
  1. Making of chemical bond
  2. More common reactions
  3. Burning of carbon
  4. All of these
Ions are held together through
  1. Physical attraction among electrons
  2. High kinetic energies of electrons
  3. Electro-static attraction between ions
  4. Static attraction between ions
Fuels like petrol and natural gas are examples of
  1. Ionic compounds
  2. Covalent bonds
  3. Metallic bonds
  4. Dative bond
Vinegar has a pH of
  1. 1
  2. 2
  3. 3
  4. 4
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