Answer:
Solute = 5 mL; solution = 250 mL  
Explanation:
The formula for percent by volume is

If you have 250 mL of a solution that is 2 % v/v,

If there is no change of volume on mixing,
Volume of solution = 250 mL
  -Volume of solute = <u>     </u><u>5</u><u>      </u> 
  Volume of solvent = 245 mL
 
        
             
        
        
        
I believe it’s evaporation?
        
             
        
        
        
These are dissolved in water to form colourless solutions, and then mixed together. This mixing leads to a double displacement reaction, essentially resulting in the metals 'swapping' their places in the two compounds, producing lead (II) iodide, and potassium nitrate.
        
             
        
        
        
Obviously since plant cell contains chloroplasts.