Question

Give reason
A.Aluminium oxide is considered as amphoteric oxide
B.magnesium start floating on the surface of water

Answer 1

◆ ANSWER A) .Aluminium oxide is considered as amphoteric oxide.

● Metal oxides which react with both acids as well as bases to produce salt and water are known as Atmospheric Oxides.

● Aluminum oxide is also react with both acids as well as bases and produce salt and water.

● EXAMPLE -

♀ When aluminum oxide react with acids.

equation - Al2O3 + 6HCl --- 2AlCl3 + H2O

♀ When aluminum oxide react with bases

equation - Al2O3 + 2NaOH --- 2NaAlO2 + H2O

◆ ANSWER B).magnesium start floating on the surface of water

● Magnesium react very slowly with cold water but react rapidly with hot water to form Magnesium hydroxide and hydrogen.

● Magnesium starts floating because the bubbles of hydrogen gas formed stick to the surface of the metal.

● Equation - Mg + H2O --- Mg(OH)2 + H2

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Answer 2

Answer:

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