Chemistry-29 Redox reaction

What are the coefficients when the equation is balanced?

• 2 + 3 --> 2 + 3 + 4
• 1 + 3 --> 1 + 3 + 2
• 2 + 4 --> 2 + 3 + 2
• 1 + 1 --> 1 + 1 + 1

Tags

NGSS.HS-PS1-7

What is oxidation number of Cr in Cr₂O_7^2-?

• -2
• +2
• +6
• +12

What is oxidation number of H in CaH₂?

• +1
• -1
• 0
• +2

If in a reaction, copper is reduced; its number of electrons has:

• Increased
• Decreased
• Remained Constant
• Varies Randomly

Tags

NGSS.HS-PS1-2

In the reaction
2Ca(s) + O₂(g) --> 2CaO(s), calcium is __________

• Reduced
• Synthesized
• Oxidized
• None of the above

     In the reaction Zn + H₂O --> ZnO₂ + H₂
 which element, if any, is oxidized? 

• Zinc
• Hydrogen
• Oxygen
• None

Tags

NGSS.HS-PS1-2

Al (s) + FeSO₄ (aq) → Al₂(SO₄)₃ (aq) + Fe (s)

Which statements are true about this reaction?

I. Al (s) loses electrons

II. Al (s) is the oxidizing agent.

III. FeSO₄ is the reducing agent.

• I and II

• I only

• II and III

• I, II and III

Tags

NGSS.HS-PS1-2

What is the oxidation number of iodine in KIO₃?

• 0

• -1

• +5

• +1

Which of the following half reactions correctly represents a reduction half reaction?

• Fe →Fe²⁺ + 2e^-

• Pb⁴⁺ + 2e^- →Pb²⁺

• 2O^-2 →O₂ + 4e^-

• Fe + 3e^- →Fe³⁺

Which change does nitrogen undergo oxidation?

• A
• B
• C
• D

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1