JEE Main 2016 Chemistry question

Not in JEE Main or NEET syllabus

The main oxides formed on combustion of Li, Na and K in excess of air are respectively:

(1), and
(2), and Correct
(3), and
(4), and

Answer: (2)

Solution

The product depends on how well the cation can stabilise the increasingly large oxide anions. The small, highly polarising stabilises only the small ion, so lithium burns to the normal oxide . The larger can stabilise the peroxide ion ,

See the full step-by-step solution

Create a free account to read the complete working, and practise questions like this in a timed test.

Create a free account

Question ID VK-115442