Question

4. Write the observation.
1) Zinc oxide is heated strongly
ii) Mercuric oxide is heated strongly
iii) Magnesium ribbon is heated in the non-luminous flame.​

Answer 1

Answer:

i) Zinc oxide (ZnO) forms colorless hexagonal crystals or a white dusty powder. When heated, its color turns into lemon yellow changing into white again when cooled down.

ii)When it is heated to a temperature above 500°C, it easily decomposes into mercury and oxygen gas. The red color of the mercury oxide reactant becomes the silver color of mercury. The color change is the sign that the reaction is occurring. Mercuric oxide.

iii)The ribbon burns with a bright white light. Intense heat is also produced in this reaction. Here, when magnesium burns, it reacts with the oxygen found in air to form a powdery ash called magnesium oxide. Chemical equation: Magnesium plus Oxygen gives Magnesium oxide

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