railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) General Science Chemistry Chemical Reaction
Which of the following statements is correct?
1
Metals react with acids and produce metal salts and hydrogen gas.
2
Non-metals react with oxygen to produce non- metallic oxides which are basic in nature.
3
On burning, metals react with oxygen to produce metal oxides which are acidic in nature.
4
Less reactive metals displace more reactive metals from their compounds in aqueous solutions.