For the redox reaction,
a
the correct stoichiometric coefficients of the reactants a, b, and c respectively for the balanced equation are:
1. 16, 5, 2
2. 2, 5, 16
3. 2, 16, 5
4. 5, 16, 2
The change in oxidation number of chlorine when Cl2 gas reacts with hot and concentrated sodium hydroxide solution is:
1. Zero to +1 and Zero to –5
2. Zero to –1 and Zero to +5
3. Zero to –1 and Zero to +3
4. Zero to +1 and Zero to –3
The reaction that does not represent auto redox or disproportionation is:
1.
2.
3.
4.
Balance the following equation and choose the quantity that is the sum of the coefficients of reactants and products :
1. 16
2. 13
3. 18
4. 12
The standard electrode potential (E°) values of Al3+/ Al, Ag+ / Ag, K+ / K, and Cr3+ / Cr are –1.66 V, 0.80 V, –2.93 V, & –0.79 V respectively. The correct decreasing order of the reducing power of the metal is:
1. | Ag > Cr > Al > K | 2. | K > Al > Cr > Ag |
3. | K > Al > Ag > Cr | 4. | Al > K > Ag > Cr |
In the given balanced chemical reaction,
\(\mathrm{IO}_3^{-}+\mathrm{aI}^{-}+\mathrm{bH}^{+} \rightarrow \mathrm{cH}_2 \mathrm{O}+\mathrm{dI}_2\)
The values of a, b, c, and d respectively are-
1. 5, 6, 3, 3
2. 5, 3, 6, 3
3. 3, 5, 3, 6
4. 5, 6, 5, 5
Oxidation number of oxygen in potassium super oxide (KO2) is-
1. – 2
2. – 1
3. – 1/2
4. – 1/4
The strongest oxidising agent among the following is :
1.
2.
3.
4.
The oxidation number of S in H2S2O8 is:
1. + 2
2. + 4
3. + 6
4. + 7
In the following reaction
Al + Fe3O4 Al2O3 + Fe
The total number of electrons transferred will be-
1. 6
2. 8
3. 8/3
4. 24