Question

4. When magnesium is burned in air, a powdery ash X is formed. X dissolving in water forms Y. a. What are (i) X and (ii) Y ? b. What is the action of Y on litmus paper? c. What conclusion do you get on the nature of Y from its action on litmus paper? d. What is the common name of the indigestion relieving medicines which contains Y?

Answer 1

AnswEr:-

• X = Magnesium Oxide.

• Y = Magnesium Hydroxide.

• Y turns litmus to blue.

• Y is basic in nature.

• Antacids.

ExplanaTion:-

a)

i) When Magnesium is burnt in air, a powdery ash X is formed So X is Magnesium Oxide.

$\\ \\ \large\rm\underline {Reaction.}$

$\star\:\:\tt Mg + O_2 \rightarrow 2Mgo.$

ii) When X (Magnesium Oxide) Is disolved in water Y is formed, So Y is Magnesium Hydroxide.

$\\ \\ \large\rm\underline {Reaction.}\\ \\ \star\:\:\tt Mgo + H_2O \rightarrow Mg(OH)_2.$

b)

The action of Y (Magnesium hydroxide) on litmus paper is that it turned litmus paper to blue.

C)

Since y turns litmus paper to blue therefore we can conclude that it is basic in nature.

D)

The common name of the indigestion relieving medicines which contain Y is Antacids.

Answer 2

Answer:

1 = x=magnisium oxide y=madnesium hydroxide

2 = litmus paper blue

3 = y= base and antacid

Explanation: