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.

X is an atom of an element in which 4th shell is the valence shell and

1.	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.
Answer» Solution :As the element burns with a brick red flame, it is calcium with electronic configuration 2, 8, 8, 2 `underset(("X"))(Ca) + O_(2) RARR underset(("Y"))(CAO)` `underset(("Y"))(CaO) + H_(2)O rarr underset(("Z"))(Ca(OH)_(2))` As `Ca(OH)_(2)` is basic in NATURE it turns phenolphthalein PINK and methyl orange yellow.