X is an atom of an element in which 4th shell is the valence shell and the number of electrons are in 1 : 1 ratio in 1st, 4th and 2nd, 3rd shells respectively. Its corresponding oxide Y on hydrolysis gives Z. Explain the changes that take place when phenolphthalein and methyl orange are added to Z separately.

Explanation

As the element burns with a brick red flame, it is calcium with electronic configuration 2, 8, 8, 2.
`underset("(X)")(Ca+O_(2)) to underset("(Y)")(CaO)`
`underset("(Y)")(CaO + H_(2)O) to underset("(Z)")(Ca(OH)_(2))`
As `Ca(OH)_(2)` is basic is nature , it turns phenol phthalein to pink and methyl organe to yellow .