Use of State symbols in Chemical Equations

Use of State symbols in Chemical Equations

Use of state symbols is very key to get marks in IB diploma exams. It is not difficult to use state symbols in chemical equations.
What is state symbols? 
State symbols are symbols used to represent the physical state of reactants and products in a chemical equation.

Example:

White solid magnesium Oxide is formed when Magnesium metal ribbon is burned in air( oxygen gas).

2Mg(s) + O2(g)    à 2 MgO(S) 

Try to write the state symbols of the following equations:

Ag⁺   + X⁻   → AgX(s)

Na₂O + H₂O → 2NaOH

 MgO + H₂O → Mg(OH)₂

Li₂O(s) + 2HCl → 2LiCl  + H₂O

MgO + 2HCl  → MgCl₂ + H₂O

P₄O₁₀+ 6 H₂O→ 4H₃PO₄