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Observe the following diagram carefully. Concentration of solution in each test tube is 0.1 M. The test tube in which a chemical reaction occurs is

(a) P & R 

(b) P & Q 

(c) Q & R 

(d) P & S

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Correct option: (a) P & R

Explanation: 

In case P : 

Al is more reactive than Zn, So reaction will occur 

2Al(s) + 3ZnSO4(aq) → Al2(SO4)3 (aq) + 3Zn (s) 

In case Q : 

Pb is less reactive than Fe, So reaction will not occur. 

Pb(s) + FeSO4(aq) → No reaction 

In case R : 

Fe is more reactive than Pb, So reaction will occur 

Fe(s) + Pb(NO3)2(aq) → Fe(NO3)2(aq) + Pb(s) 

In case S :

Ag is less reactive than Cu, So reaction will not occur 

Ag(s) + CuSO4(aq) → No reaction

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