Which of the following is not an oxidation-reduction reaction?
a. xef6(s) → xef4(s) + f2(g)
b. 2cs(s) + l2(g) → 2csl(s)
c. 2h2so4(aq) + 2ba(oh)2(aq) → 2baso4(s) + 4h2o(i)
d. zn(s) + 2agno3(aq) → zn(no3)2(aq) + ag(s)

Answer : The option (C) is not an oxidation-reduction reaction.

Explanation :

A :

This is an oxidation-reduction reaction. In this reaction, the oxidation state of 'Xe' changes from (+6) to (+4) and the oxidation state of 'F ' changes from (-1) to (0). That means 'Xe' shows reduction and 'F' shows oxidation in the reaction.

B :

This is an oxidation-reduction reaction. In this reaction, the oxidation state of 'Cs' changes from (0) to (+1) and the oxidation state of 'I' changes from (0) to (-1). That means 'I' shows reduction and 'Cs' shows oxidation in the reaction.

D :

This is an oxidation-reduction reaction. In this reaction, the oxidation state of 'Zn' changes from (0) to (+2) and the oxidation state of 'Ag' changes from (+1) to (0). That means 'Ag' shows reduction and 'Zn' shows oxidation in the reaction.

C :

This is not an oxidation-reduction reaction. In this reaction, the oxidation states are not changes.

Hence, the option (C) is not an oxidation-reduction reaction.

B.) 2Cs(s) + I2(g) > 2CsI(s)

Explanation:

edge 2021

10 years is the answer

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3