Which of the following reactions is a redox reaction? (a) K2CrO4 + BaCl2 BaCrO4 + 2KCl (b) Pb22+ + 2Br- PbBr (c) Cu + S CuS
A) (a) only
B) (b) only
C) (c) only
D) (a) and (c)
E) (b) and (c)
Question 2
Nitrogen is colorless because the minimum energy to excite an electron is in the ultraviolet section of the spectrum.
Indicate whether the statement is true or false