1. What is meant by standard temperature and pressure ?
2. Name a gas that is formed by the action of ultraviolet rays of the sun on oxygen.
3. Name the substance which causes permanent hardness in water.
4. Name a salt, the solubilty of which increases rapidly with rise of temperature.
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Definition. Standard Temperature and Pressure (STP) is defined as 0 degrees Celsius and 1 atmosphere of pressure.