Chemistry 1st Paper MCQ-Dinajpur Board-2019

1.

$[L, M, Q$ and $R$ are not real symbol of elements]

Which element of steam can be detected by $\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$ ?

2. What is the wavelength of green light in $n \mathrm{~m}$ ?

3. Which one has the smallest ionic size?

4. Which substance corrodes glass?

5. Which reagent is used to detect $\mathrm{NH}_{4}^{+}$?