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Home » A magnesium ribbon is burnt in oxygen to give a white compound X accompanied by the emission of light. If the burning ribbon is now placed in an atmosphere of nitrogen, it continues to burn and forms a compound Y. (a) Write the chemical formulae of X and Y. (b) Write a balanced chemical equation, when X is dissolved in water.
A magnesium ribbon is burnt in oxygen to give a white compound X accompanied by the emission of light. If the burning ribbon is now placed in an atmosphere of nitrogen, it continues to burn and forms a compound Y.
(a) Write the chemical formulae of X and Y.
(b) Write a balanced chemical equation, when X is dissolved in water.
CBSE | Chemical Reactions and Equations | Class 10 | NCERT Exemplar | Science
A magnesium ribbon is burnt in oxygen to give a white compound X accompanied by the emission of light. If the burning ribbon is now placed in an atmosphere of nitrogen, it continues to burn and forms a compound Y.
(a) Write the chemical formulae of X and Y.
(b) Write a balanced chemical equation, when X is dissolved in water.

Solution: a)

It is formed when magnesium ribbon is burned in oxygen with the emission of light and heat energy that magnesium oxide is formed.
X is a compound with the chemical formula MgO. After being placed in a nitrogen gas chamber for a period of time, magnesium reacts with the nitrogen to form magnesium nitride.

2Mg + O₂ →2MgO

Compound X→ MgO  [ Magnesium Oxide ]

Compound Y →Mg₃N₂  [ Magnesium Nitride ]

b) If Magnesium Oxide is dissolved in water, the product is Magnesium Hydroxide

MgO  + H₂O → Mg(OH)₂

i

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