Silver metal in ore is dissolved by potassium cyanide solution in the presence of air by the reaction
$4 Ag + 8 KCN + 0_{2} + 2 H 20$ $- \to 4 K [Ag (CN) +] 4 K 0 H$

see full answer

21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!

An Intiative by Sri Chaitanya

The amount of oxygen used in this process is $0.742 g$ (for $100 g m$ pure $A g$ ).

The amount of KCN required to dissolve $100 g$ of pure Ag is $120 g$ .

The volume of oxygen used at STP is $5.25$ liters.

The amount of oxygen used in this process is $7.40 g$ (for $100 g m$ pure Ag).

answer is A, C, D.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

Number of moles of $A g$ in $100 g m$ sample $= \frac{100}{108} = 0.925$

4 moles of $A g$ reacts with 8 moles of KCN, hence $0.925 m o l e s o f A g$ will react with $\frac{8 \times 925}{4} \times 65 = 120.25 l of KcN$

4 moles of $A g$ reacts with 1 mole of oxygen, thus $0.925$ moles will react with $\frac{1 \times 925}{4} \times 32 = 7.40 g$

Oxygen volume used in the same procedure $= \frac{1 \times 0.925}{4} \times 22.4 = 5.18 L \approx 5.20 L$

Hence, options A, C and D are correct.

Watch 3-min video & get full concept clarity