14 The equation for the effect of heat on hydrated sodium carbonate is as shown. Na2CO3. 10H2O(s) → Na2CO3(s) + 10H2O(g)
Statements made by four students about the reaction are given.
P
Anhydrous sodium carbonate is formed.
Steam is formed.
Q
R
There is a colour change from blue to white.
S
The reaction is reversible.
Which students' statements are correct?
A
P, Q and R only
B
P, Q and S only
Q, R and S only
С
D
P Q R and S

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The answer to your question would be c. mineral oil  

Answerthe half-reaction having the greatest tendency to occur at the anode:     i₂(aq) + 2e⁻  ⇄ 2i⁻  ;   e = +0.53 v======oxidation occurs at the anode. we must therefore find the half-reaction with the greatest tendency to oxidize.the given values of e are reduction potentials (the form of the half-reactions are of reduction).the lower the reduction potential, the higher the potential to oxidize. the half-cell with the lowest reduction potential will have the greatest tendency to oxidize at the anode.the half-reaction having the greatest tendency must be    i₂(aq) + 2e⁻  ⇄ 2i⁻    e = +0.53 vbecause its reduction potential is the lowest out of the three.

50? i have no !