All the group 2 elements burn in `O_(2)` to form oxides MO. These oxides can also be obtained by the thermal decomposition of
(i) carbonates , (ii) nitrates
(iii) sulphates, (iv) hydroxides

Options

A. (i),(ii)
B. (i),(iii)
C. (i),(iv)
D. (i),(ii),(iii),(iv)

Answer

D

Explanation

All these oxosalts decompose to the oxide on heating. The oxosalts are les stable to heat than the corresponding group 1 salts because the metals and their hydroxides are less basic than those of group 1.
`MCO_(3)overset(Delta)toMO+CO_(2)`
`M(OH)_(2)overset(Delta)toMO+H_(2)O`
`2MSO_(4)overset(Delta)to2MO+2SO_(2)+O_(2)`
`2m(NO_(3))_(2)overset(Delta)to2MO+4NO_(2)+O_(2)`