Assertion: the decreasing order of acidic character of `CO_(2),N_(2)O_(5),SiO_(2)` and `SO_(3)` is `SO_(3) gt N_(2)O_(5) gt CO_(2) gt SiO_(2)`.
Reason: Acidic character of oxides increases on moving top of bottom in a group and decreases on moving left to right in a periodic in modern periodic table.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If the assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If assertion is false but reason is true.

Answer

C

Explanation

Assertion: It is correct statement. Across the period the nonmetallic charcter increases, therefore, the acidic character of oxides increses. On the other hand down, the group the metallic character increases, therefore the acidic character of oxides decreases. hence the correct order of acidic character is `SO_(3)gtN_(2)O_(5)gtCO_(2)gtSiO_(2)`
`S-2` : it is incorrect statement: Acidic character of oxides decreases on moving top to bottom in a group and increase on moving left to right in a period in Modern period table.