Class X

Water which forms scum with soap is called
  1. hard water
  2. soft water
  3. distilled water
  4. un distilled water
Hard water can block radiators due to formation of
  1. insoluble calcium and magnesium salts
  2. insoluble sodium salts
  3. in soluble phosphate salts
  4. insoluble potassium salts
During thunderstorms, water dissolves
  1. dust particles
  2. HCl
  3. nitric acid
  4. clouds
Addition of washing soda removes
  1. softness of water
  2. temporary hardness of water
  3. permanent hardness of water
  4. hydrogen from water
Density of water becomes maximum at
  1. 10°C
  2. 4°C
  3. 5°C
  4. 12°C
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