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Redox Reactions - 02
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Q1. When a strip of metallic zinc is placed in an aqueous solution of copper nitrate the blue colour of the solution disappear due to formation of
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1 point
ZnS
Zn+2
Cu+2
CuS
Q2. The correct order of electron releasing tendency of the metals Cu, Zn and Ag is in the order
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1 point
Zn > Cu > Ag
Cu > Zn > Ag
Zn > Ag > Cu
Ag > Zn > Cu
Q3. What is the oxidation number of elements in the free or in the uncombined state ?
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1 point
-1
+1
+2
0
Q4. In which of the following compounds oxygen has highest oxidation state and in which it has lowest oxidation state? OF2, H2O2, KO2, O2F2
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1 point
Highest = KO2 , lowest = H2O2
Highest = OF2 , lowest = K2O2
Highest = OF2 , lowest = KO2
Highest = KO2 , lowest H2O2
Q5. ‘Oxidation number of H in NaH, CaH2 and LiH, respectively is
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1 point
+1, +1, –1
–1, +1, + 1
+1, + 1, + 1
–1,–1, –1
Q6. Which of the following is the correct representative of stock notation for auric chloride?
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1 point
Au(III)Cl3
Au(II)Cl3
Au(I)Cl3
None
Q7. Oxidation number of N in HNO3 is
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1 point
-3.5
-5
+3
+5
Q8. In which of the following reactions, there is no change invalency ?
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1 point
b
d
a
c
Q9. The oxidation number of chromium in potassium dichromate is
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1 point
-2
+4
+6
+2
Q10. The oxidation number of sulphur in S8, S2F2, H2S respectively, are
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1 point
0, +1 and +2
+2, +1 and –2
–2, +1 and –2
0, +1 and –2
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