state gov Bihar Police Constable (सिपाही) Mock Test Series 2025 General Science Chemistry Chemical Reaction
Which metals produce hydrogen gas when treated with very dilute nitric acid?
1
Copper (Cu) and cobalt (Co)
2
Magnesium (Mg) and manganese (Mn)
3
Magnesium (Mg) and copper (Cu)
4
Manganese (Mn) and cobalt (Co)