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Industrial Preparation: Contact process

A silver meta...

Question

A silver metal X taken in the form of a ribbon,when ignited,burns in air with a dazzling white flame to form a white powder Y.when water is added to power Y , it dissolves partially to form another substance Z
a. what could metal X be??
b. what is powder Y?
c. with which substances metal X combines to form powder Y?
d. what is substance Z? name one domestic use of this substance?
e. write a balanced chemical equation of the reactions which take place when metal X burns in air to form powder Y .

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Solution

a) The silver metal X is magnesium (Mg).
b) When ignited, Mg is burnt in air to form powde Y that is magnesium oxide (MgO)
c) Mg reacts with oxygen to form MgO
d) When water is added to MgO, it partially dissolve to form magnesium hydroxide (Mg(OH)₂). It is used as antacid to neutralise stomach acid.
e) Balanced chemical equation from X to Y.
2Mg + O₂ $\to$ 2MgO

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Q. 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?
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(e) Write a balanced chemical equation of the reaction which takes place when metal X burns in air to form powder Y.

Q. A substance X burns vigorously in a jar of oxygen with a brick red flame to form its oxide 'Y' which is a white powder. Which substance is X ?

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(b) When a magnesium ribbon burns in air with a dazzling flame and forms a white ash, is magnesium oxidised or reduced? Why?
(c) In the reaction represented by the equation:

{MnO}_{2} + 4 HCl \underset{}{\to} {MnCl}_{2} + 2 H_{2} O + {Cl}_{2}

(i) name the substance oxidised.
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(iii) name the substance reduced.
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