Which of the following compounds has the lowest melting point? 

• CaBr₂

• CaI₂

• CaF₂

• CaF₂

In the replacement reaction

The reaction will be most favourable if M happens to be

• Na

• K

• Rb

• Rb

Which one of the following is present as an active ingredient in bleaching powder for bleaching action?

• Ca(OCl)₂

• CaO₂Cl

• CaCl₂

• CaCl₂

What is the value of electron gain enthalpy of Na⁺ if IE₁ of Na = 5.1 eV?

• -5.1 eV

• -10.2 eV

• +2.55 eV

• +2.55 eV

On heating which of the following releases CO₂ most easily?

• K₂CO₃

• Na₂CO₃

• MgCO₃

• MgCO₃