Calcium decomposes water and liberates
O2
H2
CaO
CaO2
Which of the following gives a green colour to flame?
Barium
Calcium
Strontium
Cerium
When an aqueous solution of magnesium sulphate is treated with ammonium hydroxide, then which of the following is precipitated?
(NH4)2S
Mg3N2
MgOH
Mg(OH)2
Which of the following gas is formed when magnesium reacts with concentrated sulphuric acid?
SO2
MgO
SO3
Both '1' and '3'
