Class XI

Displacement reaction occurs when
  1. A more reactive non-metal displaces less reactive non-metals
  2. A more reactive metal displaces a less reactive metal
  3. Metal lower in reactivty series is added
  4. Both A and B
 Milk has a pH of
  1. 2
  2. 3
  3. 4
  4. 6
Sodium (Na) is not
  1. Insoluble in water
  2. A salt
  3. Explosive in air
  4. Stable in air
Potassium Hydroxide (KOH), Sodium Hydroxide (NaOH) and Copper Sulfate (CuSO4) solutions are
  1. Strong electrolyte
  2. Non-electrolyte
  3. Weak electrolyte
  4. Acidic
 Less vitamins and valuable nutrients are destroyed if the
  1. Smaller particles are cooked
  2. Larger food particles are cooked
  3. If food is frozen
  4. If food is fried
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