When you saw the penny demo, the penny turned silver before it turned gold. The demo
used zinc, Zn (s), and zinc chloride, ZnCl, (aq).
Do you think the penny was coated with actual silver, Ag?

Ithink is d. physical property

Answer ozone (o3) is made of three atoms of oxygen, it is a molecule;

Reaction involved in present system is :   c12h22o11 + h2o → 2 c6h12o6the reaction system is obeying following rate law:   rate = k[c12h22o11]thus, it is a first order reaction.now, for 1st order reactionrate constant (k) =  given: initial conc. = 3.0 g, final conc. = 2.7 g, t = 2.5 h∴rate constant (k) =  ∴ k = 0.04215 h-1now, for 1st order reaction, half life = 0.693/k = 0.693/0.04215 = 16.4 hthus correct answer is option b