Question

It is advisable not to cover egg yolk or mustard with silver cutlery because:

• A. Silver reacts with the water of egg yolk to form $AgOH$
• B. Silver reacts with the sulphur of the egg yolk forming black $A{g}_{2}S$
• C. Silver reacts with the egg yolk forming $A{g}_{2}S{O}_4$ which is a poisonous substance
• D. Silver attracts UV light of the atmosphere, thereby spoiling the food

Answer 1

The correct option is B Silver reacts with the sulphur of the egg yolk forming black $A{g}_{2}S$

Both egg yolk and mustard contain a large quantity of sulphur, which on reaction with $Ag$ forms $A{g}_{2}S$.
$2Ag+S\to A{g}_{2}S$ (black colour)