Which Of The Following Has The Highest Decomposition Temperature?

When magnesium burns in air compounds of magnesium formed are magnesium oxide and

A solid compound ‘X’ on heating gives CO₂ gas and a residue. The residue mixed with water forms ‘Y’. On passing an excess of CO₂ through ‘Y’ in water, a clear solution ‘Z’ is obtained. On boiling ‘Z’, compound ‘X’ is reformed. The compound ‘X’ is 

The carbonate that will not decompose on heating is

The correct order of increasing thermal stability of K₂CO₃, MgCO₃, CaCO₃ and BeCO₃ is: 

In which of the following the hydration energy is higher than the lattice energy?

The solubility of alkali metal hydroxide follows the order:

The label on a bottle of H₂O₂ solution reads as ’10 volume’. The concentration of H₂O₂ in percentage by volume is

Bleaching powder slowly loses its activity when it stands in air. This is due to

Chloride of an element gives natural solution in water. In the periodic table the element belongs to

Among the following compounds of cement which is present in the highest amount?