railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) General Science Chemistry Chemical Reaction
Silver ornaments become black after some time when exposed to air because:
1
Silver reacts with carbon in the air to form silver carbide.
2
Silver reacts with sulphur in the air to form silver sulphide.
3
Silver reacts with nitrogen in the air to form silver nitride.
4
Silver reacts with hydrogen in the air to form silver hydride.