Answer:
A simple example of decomposition reaction is hydrolysis of water where a water molecule is broken down into hydrogen and oxygen gas.
 
        
             
        
        
        
It depends on the substance,but for most substance it is in the gaseous state.
        
                    
             
        
        
        
  The liters in   3.25 g   of  ammonia  4.28 L
   <u><em>calculation</em></u>
  Step 1: find moles of ammonia
  moles = mass÷ molar  mass
  From  periodic    table  the molar mass  of ammonia (NH₃)  =  14 +(1×3 ) = 17  g/mol
 3.25 g÷ 17 g/mol = 0.191   moles
 Step 2: find the number of liters of ammonia
  that is at STP  1  moles = 22.4 L
                         0.191 moles = ? L
 <em>by cross  multiplication</em>
  ={( 0.191   moles  ×22.4 L) / 1 mole}  = 4.28 L
 
        
                    
             
        
        
        
The correct answer is option 2. When Pt2+ is reduced it loses electrons, oxidizing it. The oxidation number is the charge of the atom. Adding an electron, decreases the net charge consequently the oxidation number.
        
                    
             
        
        
        
Any of the Halogens (second to last vertical column going down)