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 solubility in water of sulphates down the Be group is:

Be > Mg > Ca > Sr > Ba. This is due to

Which of the following is the correct order of gradually decreasing basic nature of the oxides?

KO₂ (potassium superoxide) is used in oxygen cylinders in space and submarnies because it 

A metal M readily forms water soluble sulphate MSO₄, water insoluble hydroxide M(OH)₂ and oxide MO which becomes inert on heating. The hydroxide is soluble in NaOH. The metal M is

On dissolving moderate amount of sodium metal in liquid NH₃ at low temperature, which one of the following does not occur?

On passing hydrogen over heated palladium, the gas

Which one of the alkaline earth metals shows some anomalous behavior and has same electronegativity as aluminium?

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

The carbonate that will not decompose on heating is

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