Question

a metal x reacts with oxygen to form metal oxide y used in cement industry. y dissolves in water producing z with hissing sound which is used for whitewashing.the clear solution of z reacts with co2 to form white precipitate.identify x, y, z and write chemical reactions involved

Answer 1

X is Calcium (Ca).
Ca2 + O2 = 2 CaO

Y is Calcium Oxide (CaO).
CAO + H2O = CA(OH)2

Z is Calcium Hydroxide [Ca(OH)2]
CA(OH)2 + CO2 = CACO3 + H2O