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.

Lakhmir Singh Chemistry Class 10

Answer 1

X is magnesium
Y is magnesium oxide
Magnesium reacts with oxygen in air
2Mg + O2 gives 2MgO

Answer 2

Hey Dear,

# Reactions explained -

1. Mg + O2 --> MgO
2. Mg + H2O --> Mg(OH)2

● Answers -

(a) Metal X is magnesium (Mg).

(b) Powder Y is magnesium oxide (MgO).

(c) Magnesium combines with oxygen (O2) in the air to form magnesium oxide (MgO).

(d) Use of Z : Mg(OH)2 - laxative, antacid, waste water treatment.

(e) Reaction is as follows -

2Mg + O2 --> 2MgO

Thanks for asking..