In the following reaction, Cl_2 is. Cl_2(g)+ H-2O(l) (HCI(aq) + HCIO(aq) a. the

Question

In the following reaction, Cl_2 is. Cl_2(g)+ H-2O(l) (HCI(aq) + HCIO(aq) a. the oxidizing agent. b. the reducing agent. c. both the oxidizing agent and the reducing agent d. neither an oxidizing agent e. none of the above. Which metal will NOT displace hydorgen from either water or HCl? a. Ag b. Pb c. Zn d. Al e. Na Which of the following reactions is NOT spontaneous? a. 2KCl(aq) + f_2(g) rightarrow 2KF(aq) + cl_2(g) b. 2KCl(aq) + 2H_2O(l) rightarrow 2KI(aq) + cl_2(g) c. 2Na(s) + 2H_2O(l)rightarrow K_2SO_4 (aq) + Zn(s) e. 2Nal(aq) + Br_2(l rightarrow 2NaBr(aq) + I_2(s)

Explanation / Answer

Ans-1)

Given chemical equation,

Cl2 (g) + H2O (l) -----------> HCl (aq.) + ClOH (aq.)

O.S. of Cl in various species involved in above chemical equation are,

i) Cl2. Molecular state hence O.S. of Cl is 0 (Zero)

ii) HCl: Cl is more electronegative than H and hence in HCl O.S. of Cl is -1.

iii) HOCl or HClO:

O.S. of H is +1 in all it's acids and oxyacids. O.S. of O is -2 in oxyacids. Charge on HClO is 0. Using this we can calculate O.S. of Cl as,

O.S. of H + O.S. of Cl + O.S. of O = 0

(+1) + O.S. of Cl + (-2) = 0

O.S. of Cl - 1 = 0

O.S. of Cl = 0 +1

O.S. of Cl = +1

Hence in HOCl O.S. of Cl is +1.

It's clear that,

Cl is reduced as it goes from Cl2 (0 O.S.) to HCl (-1 O.S.). Here Cl2 act self oxidant.

And

Cl is oxidized as it goes from Cl2 (0 O.S.) to HClO i.e. Cl-OH (+1 O.S.). Here Cl2 act as self reductant.

There in given chemical transformation,

Cl2 is both the oxidizing agent and the reducing agent. (Option-C).

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Ans-1b)

Ag i.e. silver is most unreactive metal among the given and will not displace H+ from Water H-OH or acid H-Cl.

Metals like Ag, Au, Pt, are termed as Coinage metals.

Answer option-a).

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Most reactive element displace less reactive metal.

Reactivity order must be

Cl > Br > I.
it meas F2 displaces Cl/Br/I from KCl/KBr/KI respectively.

Cl2 displace Br/I from KBr/KI. But Cl cant displace F fro KF.

Br2 displaces I from KI or NaI. But Br2 cannot dislace F/Cl from KF/KCl.

I2 cannot displace F/Cl/Br from respective salts KF/KCl/KBr.

Hence

Non-spontaneous reaction is 2KCl + I2 (s) ----------> 2KI (aq.) + Cl2 (g)

Answer option-b)

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