Class X

Ratio of hydrogen (H) and oxygen (O) in water molecule by volume is
  1. 2: 1
  2. 1: 2
  3. 3: 1
  4. 4: 1
Water which forms scum with soap is called
  1. hard water
  2. soft water
  3. distilled water
  4. un distilled water
Hardness which can be removed by boiling is called
  1. permanent hardness
  2. temporary hardness
  3. stiffness
  4. toughness
Addition of washing soda removes
  1. softness of water
  2. temporary hardness of water
  3. permanent hardness of water
  4. hydrogen from water
Water exist in only
  1. one state
  2. two state
  3. three states
  4. 4 states
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