Give the n factors for the following changes: -
(i) Na2CO3→NaHCO3

(ii) Al2(SO4)3→Al(OH)3

(iii) Na2S2O3→S4O2−6

(A) 1,3,2

(B) 1,3,1

(C) 1,6,1

(D) 2,6,1

To determine the factors for the given changes, let's analyze each reaction:

(i) Na2CO3 → NaHCO3

The change involves the conversion of sodium carbonate (Na2CO3) to sodium bicarbonate (NaHCO3). The factors for this change would be:

1 factor: Sodium (Na)
3 factors: Carbon (C), Oxygen (O), Hydrogen (H)

So, for this change, the factors are 1, 3.

(ii) Al2(SO4)3 → Al(OH)3

The change involves the conversion of aluminum sulfate (Al2(SO4)3) to aluminum hydroxide (Al(OH)3). The factors for this change would be:

1 factor: Aluminum (Al)
6 factors: Sulfur (S), Oxygen (O), Hydrogen (H)

So, for this change, the factors are 1, 6.

(iii) Na2S2O3 → S4O2−6

The change involves the conversion of sodium thiosulfate (Na2S2O3) to thiosulfate ion (S4O2−6). The factors for this change would be:

1 factor: Sodium (Na)
1 factor: Sulfur (S)
6 factors: Oxygen (O)

So, for this change, the factors are 1, 1, 6.

Now, comparing with the options given:

(A) 1,3,2
(B) 1,3,1
(C) 1,6,1
(D) 2,6,1

The correct factors for the changes are 1,3,1. So, the correct option is (B).