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25. What is the oxidation number of the indicated element in each of the following species?...

25. What is the oxidation number of the indicated element in each of the following species?

A. ClinCl2is+2
Cr in K2Cr2O7 is +2 NinNO3-is+3

B. Cl in Cl2 is 0
Cr in K2Cr2O7 is +6 N in NO3- is +6

C.ClinCl2 is+7
Cr in K2Cr2O7 is +3 NinNO3-is-2

D. ClinCl2 is0
Cr in K2Cr2O7 is +6 NinNO3-is+5

E. ClinCl2is-1
Cr in K2Cr2O7 is +2 N in NO3- is -3

26. Which of the following statements is correct about the reaction shown below:

3Mg(s) + 2Au3+(aq)  3Mg2+(aq) + 2Au(s)

A. Mg is being reduced, and Au3+ is the oxidizing agent. B. Mg is being reduced, and Au3+ is the reducing agent. C. Au3+ is being reduced, and Mg is the oxidizing agent. D. Au3+ is being oxidized, and Mg is the reducing agent. E. Mg is being oxidized, and Au3+ is the oxidizing agent.

27. Which of the following are oxidation reduction reactions?

W. CaCl2(aq) + Na2CO3(aq)  CaCO3(s) + 2NaCl(aq) X. Na(s) + H2O(l)  NaOH(aq) + H2(g)
Y. Sn(s) + 4HNO3(aq)  SnO2(s) + 4NO2(g) + 2H2O(l) Z. HCl(aq) + NaOH(aq)  NaCl(aq) + H2O(l)

  1. W and Z

  2. W only

  3. XandY

  4. W, X, and Z

  5. X only

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25) 25) Oxidatim ole of can cl2 = 0. In uncombined state, oxidation no at element If zero. K₂ Cr 2 og let cue oxidation no ofI loxidation no otN) + 3( Oxidatim uo of s -1 I(X) + 3(-2) = -1 7 x-6= -1 => x=+5) oxidation no ct Niu Noix +5. Option7 Redox reaction. The reaction in coluich both oxidation and reduction Make place simultaneously it Called Redox reaction, Re

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