Question

A silvery-white metal X taken in the form of ribbon, when ignited, burns in air with a dazzling white flame to form a white powder Y. When water is added to powder Y, it dissolves partially to form another substance Z.
(a) What could metal X be?
(b) What is powder Y?
(c) With which substance metal X combines to form powder Y?
(d) What is substance Z? Name one domestic use of substance Z.
(e) Write a balanced chemical equation of the reaction which takes place when metal X burns in air to form powder Y.

Answer 1

Answer:

I hope it will help you...

Answer 2

Magnesium is the Metal X

Explanation:

a) Magnesium, Mg. is the white metal in the form of ribbon which on ignition forms white powder.

(b) Magnesium oxide, MgO is the powder being formed.  

(c) Oxygen (of air),$O_2$  is the Substance with which MgO combines.

(d) Magnesium hydroxide, $Mg(OH)_2$is the metal Z & it is used as antacid to relieve indigestion.  

(e) The Balanced chemical reaction is -

$2Mg + O_2 --> 2MgO$

$Magnesium + Oxygen --> Magnesium Oxide$