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Q1.Write the chemical equation for Phosphorus burns in chlorine to form phosphorus pentachloride.
Q2. How you will indicate the following effects in the chemical equation:
(i) Formation of a precipitate
(ii) Evolution of a gas.
Q.3 When solid mercury oxide is heated, liquid mercury and oxygen gas are produced. Represent it with chemical equation.

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  1. P4+10CL2 =4PCI5
  2. precipitation is the creation of a solid from a solution .when reaction occurs in a liquid solution, the solid form is called precipitation.
  • evolution of gas is a chemical reaction in which one of the end products is a gas  such as oxygen or CO2.
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