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'T'h'e' 'd'i'f'f'e'r'e'n'c'e' 'i'n' 'r'e'v'e'r's'i'b'l'e' 'p'o't'e'n't'i'a'l' 'b'e't'w'e'e'n' 'o'x'y'g'e'n' 'r'e'd'u'c't'i'o'n' 'r'e'a'c't'i'o'n' 'a'n'd' 'h'y'd'r'o'g'e'n' 'e'v'o'l'u't'i'o'n' 'r'e'a'c't'i'o'n' 'o'f' 'a'n'y' 'p'H' 'i'n' 'a'n' 'a'q'u'e'o'u's' 'e'l'e'c't'r'o'l'y't'e' 'i's' '.' '.' '.' '.' '.' '.' '.' '.' 'v'o'l't'.' '['G'i'v'e'n',' 's't'a'n'd'a'r'd' 'r'e'd'u'c't'i'o'n' 'p'o't'e'n't'i'a'l's' 'f'o'r' 'h'y'd'r'o'g'e'n' 'e'v'o'l'u't'i'o'n' 'r'e'a'c't'i'o'n',' '$'$''f'r'a'c'{'{'{'E'^' ''c'i'r'c' '}'2'{'H'^' '+' '}'}'}'{'{'{'H'_'2'}'}'}' '=' 'O'V','S'H'E'$'$' 'a'n'd' 'o'x'y'g'e'n' 'r'e'd'u'c't'i'o'n' 'r'e'a'c't'i'o'n' ':' '$'$''f'r'a'c'{'{'{'E'^' ''c'i'r'c' '}'{'O'_'2'}'}'}'{'{'4'O'H'}'}' '=' '0'.'4'V','S'H'E'.'$'$' 'A'l's'o' 'P'H' '2' '=' 'P'O' '2' '=' '1' 'a't'm']'
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Which of the following is/are the methods for surface preparation for coating application?