Sodium nitroprusside when added to an alkaline solution of sulphide ions produces

Sodium nitoprusside when added to an alkaline solution of sulphide ions produce a

What happends when : (a) Aqueous solution of lead acetate and sodium sulphide are mixed with each, (b) A few drops of sodium nitroprusside are added to the aqueous solution containing sodium suphide. (c) An aqueous solution containing sodium iodide is treated with a few drops of CS_(2) followed by excess of chlorine water. (d) Phoshorus is fused with sodium peroxide

When KI is added to an acidified solution of sodium nitrite