Assertion : Cu is stronger reducing agent than H2.
Reason : E° of Cu2+/Cu is negative.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
When KMnO4 reacts with KBr in alkaline medium gives bromate ion. Then oxidation state of Mn changes from +7 to
+6
+4
+3
+2
Assertion : Chlorine undergoes disproportionation reaction in alkaline medium.
Reason : Cl2 is an oxidising agent.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
B.
If both assertion and reason are true but reason is not the correct explanation of assertion
Cl2 + 2NaOH (dil.) NaCl + NaOCl + H2O
3Cl2 + 6NaOH (conc.) 5naCl + NaClO3 + 3H2O
Chlorine undergoes the simultaneous oxidation-reduction. Chlorine is simultaneously reduced to chloride ion (Cl-) and is oxidised to either ClO- or ClO3- ion. Halogens (e.g. Cl) have a strong tendency to accept electrons, so they act as strong oxidising agents.
Assertion : The formal oxidation no. of sulphur in Na2S4O6 is 2.5.
Reason : Two S-atoms are not directly linked with O-atoms.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
The correct order of stability of the superoxides is
KO2 > RbO2 > CsO2
KO2 > CsO2 > RbO2
CsO2 > RbO2 > KO2
RbO2 > CsO2 > KO2
In the balanced chemical reaction
IO3- + aI- + bH+ → cH2O + dI2
a, b, c and d respectively corresponds to
5, 6, 3, 3
5, 3, 6, 3
3, 5, 3, 6
5, 6, 5, 5
Among the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other, in
Tl+, Tl3+
Cu+, Cu2+
Cr2+, Cr3+
V2+, VO2+