Question

Which of the following, on thermal decomposition, form both acidic and basic oxides along with O\(_2\)?
(i) NaNO3
(ii) Ca(NO3)2
(iii) Be(NO3)2
(iv) LiNO3

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

Hint:

Group 1 nitrates decompose into nitrites, while Group 2 nitrates form both acidic and basic oxides.

Answer 1

The Correct Option is C

Step 1: Understand Thermal Decomposition of Nitrates When metal nitrates decompose: \[ M(NO_3)_2 \rightarrow MO + NO_2 + O_2 \] For Group 2 (Be, Ca) and Li:
They decompose into basic metal oxides (e.g., CaO, BeO) and acidic oxides (NO\(_2\)). For NaNO\(_3\):
It decomposes into NaNO\(_2\) and O\(_2\), not both acidic and basic oxides.
Step 2: Identify Correct Options
Ca(NO\(_3\))\(_2\) forms CaO (basic) and NO\(_2\) (acidic).
LiNO\(_3\) forms Li\(_2\)O (basic) and NO\(_2\) (acidic).
Thus, the correct answer is \( ii, iv \).