Which of the following is a redox?

[nothing123]

Which of the following is a redox reaction?
A. TiCl4(g) + 2 Mg(l) D Ti(s) + 2 MgCl2(l)
B. NH3(g) + CO2(g) + H2O(l) NH4HCO3(aq)
C. NaCl(s) + NaHSO4(s) D HCl(g) + Na2SO4(s)
D. NaOH(aq) + H3PO4(aq) NaH2PO4(aq) + H2O(l)
E. None of the above

Also another q.
The primary reason for the nonexistence of NaCl2 is that:
A. Cl has a low electron affinity.
B. the Cl2
– ion has been observed only as a ligand in coordination complexes of transition metal ions.
C. NaCl2 would have very high lattice energy.
D. the expected repulsion between the Cl atoms is strong.
E. Na has a high second ionization energy.

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[bjb305]

Which of the following is a redox reaction?
A. TiCl4(g) + 2 Mg(l) D Ti(s) + 2 MgCl2(l)
B. NH3(g) + CO2(g) + H2O(l) NH4HCO3(aq)
C. NaCl(s) + NaHSO4(s) D HCl(g) + Na2SO4(s)
D. NaOH(aq) + H3PO4(aq) NaH2PO4(aq) + H2O(l)
E. None of the above

Also another q.
The primary reason for the nonexistence of NaCl2 is that:
A. Cl has a low electron affinity.
B. the Cl2
– ion has been observed only as a ligand in coordination complexes of transition metal ions.
C. NaCl2 would have very high lattice energy.
D. the expected repulsion between the Cl atoms is strong.
E. Na has a high second ionization energy.

first question...
A) reason being that Mg on the left side is at oxidation state of 0 and on the right it is +2.. redox reactions are usually easy to find when you have an element in its standard state on one side, and combined in a molecule on the other side

second question...
my guess is E. in order for NaCl2 to exist, that means 2 electrons must be stripped from Na. after the first is stripped (Na+) the sodium cation has a full octet in its valence shell, so pulling another electron away will ruin that stability

 

[Lotus89]

Which of the following is a redox reaction?
A. TiCl4(g) + 2 Mg(l) D Ti(s) + 2 MgCl2(l)
B. NH3(g) + CO2(g) + H2O(l) NH4HCO3(aq)
C. NaCl(s) + NaHSO4(s) D HCl(g) + Na2SO4(s)
D. NaOH(aq) + H3PO4(aq) NaH2PO4(aq) + H2O(l)
E. None of the above

Also another q.
The primary reason for the nonexistence of NaCl2 is that:
A. Cl has a low electron affinity.
B. the Cl2
– ion has been observed only as a ligand in coordination complexes of transition metal ions.
C. NaCl2 would have very high lattice energy.
D. the expected repulsion between the Cl atoms is strong.
E. Na has a high second ionization energy.

1) is A because the Mg was oxidized and lost electrons, and I dont know about q 2

 

[BerkReviewTeach]

Which of the following is a redox reaction?
A. TiCl4(g) + 2 Mg(l) D Ti(s) + 2 MgCl2(l)
B. NH3(g) + CO2(g) + H2O(l) NH4HCO3(aq)
C. NaCl(s) + NaHSO4(s) D HCl(g) + Na2SO4(s)
D. NaOH(aq) + H3PO4(aq) NaH2PO4(aq) + H2O(l)
E. None of the above

Also another q.
The primary reason for the nonexistence of NaCl2 is that:
A. Cl has a low electron affinity.
B. the Cl2
– ion has been observed only as a ligand in coordination complexes of transition metal ions.
C. NaCl2 would have very high lattice energy.
D. the expected repulsion between the Cl atoms is strong.
E. Na has a high second ionization energy.

why do your questions have five answer choices?

 

[ProteinChemist]

2nd Question:

I think whoever said E is correct because you'd have to ionize Na to +2 to get a decent probability of forming NaCl2 and the sodium probably doesn't want to be 2+ since it's outer valence shell is full at +1.

 

[Bernoull]

2nd question is definitely E.

Remember ions want to be "like noble gases". When Na is oxidized to Na+, it's isoelectronic with Ne and it's stabilized. Na2+ will have a prohibitively high 2nd ionization energy as stated by bjb305 and ProteinChemist.