1) Which is true about redox a) no net change of the number of electrons b) reduction loses electrons c) a single element cannot undergo both oxidation and reduction 2) What is the Oxidation state of Ca2+ a) 2+ b) +2 c) 0 3) H's oxidation state in MgH2 is _____ and O's oxidation state in MgO is ___ a) -1,-2 b) +1,2  c) -2, 2 d) -1, +2 4) The colour of KI solution a) clear b) yellow c) colourless d) black 5) Colour of KMNO4 a) green b) rusty c) yellow d) colourless e) purple

Redox

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