Category: S-BLOCK ELEMENTS

A. small size
B. high charge density
C. less electropositivity
D. all of the above

A. Na2CO3
B. Na2CO3.10H2O
C. Na2CO3.H2O
D. NaHCO3

A. Lithium
B. Sodium
C. Potassium
D. Rubidium

A. Base
B. Basic salt
C. Ashes
D. Spirit

A. high first ionization potential
B. high second ioniation potential
C. high ionic radius
D. high electronegativity

A. Smaller electronegativity of alkali metals
B. Smaller ionic radius of these metals
C. De-excitation of electrons from higher energy levels to low energy level
D. Excitation of electrons from low energy levels to higher energy levels

A. N2
B. O2
C. N2 and O2
D. Ne