Which of the following Statements are correct for alkali metal Compounds

i)   Super oxides are paramagnetic in nature 

ii)  The basic strength of hydroxides increases down the group

iii)  Alkali metal carbonates  thermal stability increases  down the group 

iv)  Thermal stability of alkali metal hydrides increase down the group.

• A

  (i),  (ii) only      

• B

  (i),  (ii),  (iii) only

• C

  (ii), (iv) only    

• D

  (ii),  (iii),  (iv)   only