[" 52.Which amome the following pliefs are linear ( "a-x)" is the "],[" oonsernment of reacturing after time."],[[" (1) "(a-x)" vs "4" stor a first critic reaction "],[" (2) "(a-x)" vs "2" for a refier teaction "],[" (3) "(a-x)" rst for a second order reaction "],[" (4) "1(a-x)" rs "4" for a second erder reaction "],[[" (4) "1/(a-x)" is "4" for a secund erder reaction "]],[[" (a) "1" and "2," (b) "2" and "3],[" (c) "2" and "3," (d) "2" and "4],[" (c) "1" and "4]]]