Three elements form their respective oxides A, B and C. A and C are gases and 'B' is a solid which on dissolution in water turns red litmus to blue. In presence of moisture, 'A' turns blue litmus red and 'C' is neutral to litmus. Then, A,B and C may be respectively

Options

A. `SO_(3), MgO, NO`
B. `SO_(2), CaO, CO_(2)`
C. `CO,Na_(2)O, SO_(3)`
D. `SO_(2), Ca(OH)_(2), NO_(2)`

Answer

A

Explanation

`SO_(3)` in presence of moisture turns blue litmus to red. NO is a neutral oxide and does not respond to litmus test. MgO is basic and turns red litmus to blue.