Consider the following chemical equations. Select the equations that represent c

Question

Consider the following chemical equations.  Select the equations that represent chemical reactions, rather than physical changes.
  I. 2NO(g) + O2(g) ? 2NO2(g)
II.  CO2(s) ? CO2(g)
III.  Pb(NO3)2(aq) + 2AgCl(aq) ? PbCl2(s) + 2AgNO3(aq)                 A. I, II, and III                 B. I and II only                 C. I and III only                 D. I only                 E. II and III only Consider the following chemical equations.  Select the equations that represent chemical reactions, rather than physical changes.
  I. 2NO(g) + O2(g) ? 2NO2(g)
II.  CO2(s) ? CO2(g)
III.  Pb(NO3)2(aq) + 2AgCl(aq) ? PbCl2(s) + 2AgNO3(aq)                 A. I, II, and III                 B. I and II only                 C. I and III only                 D. I only                 E. II and III only I, II, and III I and II only I and III only I only II and III only                 A. I, II, and III                 B. I and II only                 C. I and III only                 D. I only                 E. II and III only

Explanation / Answer

Answer is C. I and III only

In reaction I, the NO is getting converted to NO2
through the oxidation.

Reaction II deals with the phase change from solid CO2 to gaseous CO2

Reaction III is a popular chemical reaction, the chemical species are getting changed.

The different states, mentioned in brackets are the states of the different reactants and//or products

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