Q.

(p) Na(q) KOH(r) Na/Pb(s) Cs(i) Photoelectric cell(ii) TEL for petrol(iii) Soft soap(iv) Coolant in fast breeder reactor

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a

p→ (iii); (q)→ (iv); (r)→ (ii); (s)→ (i)

b

p→ (i); (q)→ (ii); (r)→ (iii); (s)→ (iv)

c

p→ (iii); (q)→ (iv); (r)→ (i); (s)→ (ii)

d

p→ (iv); (q)→ (iii); (r)→ (ii); (s)→ (i)

answer is D.

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Detailed Solution

(p) Liquid sodium has been used as a coolant for nuclear reactors.(q) KOH is used in soft soaps(r) Na/Pb is used as TEL for petrol. (s) Cesium is used to make photoelectric cells due to lower ionization enthalpy than that of lithium.
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(p) Na(q) KOH(r) Na/Pb(s) Cs(i) Photoelectric cell(ii) TEL for petrol(iii) Soft soap(iv) Coolant in fast breeder reactor