Which element is oxidized in the following reaction? Cu + HNO3—> CuNO3+H2 -Cu -N
ID: 574301 • Letter: W
Question
Which element is oxidized in the following reaction? Cu + HNO3—> CuNO3+H2 -Cu -N -O -HZn lies above Pb in the activity series of metals. Which of the following statements is correct? -Pb will react with Zn2+ -Pb2+ will react with Zn2+ -Zn2+ will react with Pb
Fill in the blank: In the course of the reaction each magnesium atom looses (blank) electrons to become Mg2+ ion 2Mg+O2—>2MgO
Which element has been oxidized and which one has been reduced? 2 Na + FeCl2 2NaCl + Fe
Which element has been reduced? AgNO3 + Cu —> CuNO3 + Ag -Cu -Ag -N
Which element has been reduced? 2 H2 + O2 —> 2 H2O Which element is oxidized in the following reaction? Cu + HNO3—> CuNO3+H2 -Cu -N -O -H
Zn lies above Pb in the activity series of metals. Which of the following statements is correct? -Pb will react with Zn2+ -Pb2+ will react with Zn2+ -Zn2+ will react with Pb
Fill in the blank: In the course of the reaction each magnesium atom looses (blank) electrons to become Mg2+ ion 2Mg+O2—>2MgO
Which element has been oxidized and which one has been reduced? 2 Na + FeCl2 2NaCl + Fe
Which element has been reduced? AgNO3 + Cu —> CuNO3 + Ag -Cu -Ag -N
Which element has been reduced? 2 H2 + O2 —> 2 H2O Cu + HNO3—> CuNO3+H2 -Cu -N -O -H
Zn lies above Pb in the activity series of metals. Which of the following statements is correct? -Pb will react with Zn2+ -Pb2+ will react with Zn2+ -Zn2+ will react with Pb
Fill in the blank: In the course of the reaction each magnesium atom looses (blank) electrons to become Mg2+ ion 2Mg+O2—>2MgO
Which element has been oxidized and which one has been reduced? 2 Na + FeCl2 2NaCl + Fe
Which element has been reduced? AgNO3 + Cu —> CuNO3 + Ag -Cu -Ag -N
Which element has been reduced? 2 H2 + O2 —> 2 H2O
Explanation / Answer
Increasing oxidation number is oxidation and decrease in oxidation number is reduction
Which element is oxidized in the following reaction?
Cu + HNO3—> CuNO3+H2 Oxidation states : elemental Cu=0 Cu in CuNO3 = +2
H in HNO3 =+1 H in H2 (elemental state)=0
Cu get oxidized as it oxidation number increases from 0 to +2
Zn lies above Pb in the activity series of metals. Which of the following statements is correct?
-Pb will react with Zn2+ -wrong
-Pb2+ will react with Zn2+ -wrong
-Zn2+ will react with Pb -wrong
A metal can displace metal ions listed below it in the activity series, but not above.
Zn is more active than Pb and is able to displace Pb2+ from solution
Hence, Pb2+ will react with Zn
Fill in the blank:
In the course of the reaction each magnesium atom looses (two electrons) electrons to become Mg2+ ion
2Mg+O2—>2MgO
Which element has been oxidized and which one has been reduced?
2 Na + FeCl2 -----> 2NaCl + Fe
Na oxidation state increased from 0 to +1 (Oxidized)
Fe oxidation state decreased from +2 to 0 (Reduced)
Which element has been reduced?
AgNO3 + Cu —> CuNO3 + Ag
Ag oxidation state decreased from +1 to 0 (Reduced)
Cu oxidation state increased from 0 to +2 (Oxidized)
Oxidation state of N remains unchanged
Which element has been reduced?
2 H2 + O2 —> 2 H2O
'O' oxidation state decreased from 0 to -2 (Reduced)
'H' oxidation state increased from 0 to +1 (Oxidized)
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