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Water
Water

Water is the most common substance on the earth. The natural sources of water are rain, rivers, lakes, springs, sea, wells, etc. Rainwater is regarded as one of the purest forms of naturally occurring water. Rain is produced by the condensation of the water vapour present in the air. Nearly one-third of the rainwater sweeps into the ground through soft and loose strata of sand, gravel and chalk and then reaches some impermeable stratum of clay and slate. It remains trapped in this layer and tries to escape out through the small cracks of rocks which we call spring. The water in the well is one example of trapped water below the ground. Water from wells has been used from time immemorial for drinking and irrigational purposes.

Physical properties of water

  • Pure water is colourless, tasteless and has no smell.
  • Water can be found in three state solid, liquid and gas.
  • Water is transparent.
  • Melting and boiling point of water is 0oc and 100oC respectively.
  • Water has no definite shape.
  • Water retains heat, so its temperature falls slowly.

Chemical properties of water

  • Water is formed from two atoms of hydrogen and one atom of oxygen (H2O).
  • Water is neutral. It has neither basic or nor acidic properties.
  • Temperatures of 212°F (or 100°C) are required to break the hydrogen bonds and convert liquid water into water vapor.

 

 

  • The natural sources of water are: rain, rivers, lakes, springs, sea, wells, etc.
  • Rainwater is regarded as one of the purest form of naturally occurring water.
  • The evaporated water vapour is taken to the long distances by the wind and it becomes cloud due to condensation of water vapour.
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Very Short Questions

The natural sources of water are rain water, rivers, lakes, springs, sea, wells, etc.

Rainwater is regarded as one of the purest form of naturally occurring water.

The physical properties of water are:

  • Pure water is colourless, tasteless and has no smell.
  • Water can be found in three state solid, liquid and gas.
  • Water is transparent.
  • Melting and boiling point of water is 0oc and 100oC respectively.
  • Water has no definite shape.
  • Water retains heat, so its temperature falls slowly.

The chemical properties of water are:

  • Water is formed from two atoms of hydrogen and one atom of oxygen (H2O).
  • Water is neutral. It has neither basic or nor acidic properties.
  • Temperatures of 212°F (or 100°C) are required to break the hydrogen bonds and convert liquid water into water vapor.

The melting and boiling point of water is 0oC and 100oC.

Water is composed of two atoms of hydrogen and one atom of oxygen (H2O).

0%
  • Which one of the following is not natural sources of water?

    River
    Spring
    Tap
    Rain water
  • Purest form of water resource is ______.

    river


    tap


    spring


    rain water


  • Which of the following is considered as universal solvent?

    Hydrochloric acid
    Sulphuric acid
    Water
    Acetic acid
  • Temperatures of ______ are required to break the hydrogen bonds.

    0oC


    125oC


    100oC


    150oC


  • Water is ______ substances.

    acidic


    neutral


    basic


    salt


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