Question

The metal oxide which decomposes on heating is:
A.ZnO
B.HgO
C .$A{l_2}{O_3}$
D.CuO

Answer 1

When metal oxide decomposes by heat, it gives the metal and oxygen. As we know that metals are very useful materials and found uncombined in the earth’s crust. Decomposition of metal oxide by heating forms as a product of oxygen and metal so here we find the metal oxide.

Complete step by step answer:
Here first of all we see the four metal oxides in options, but we find the metal oxide decomposes on heating at normal temperature. Some metal oxides are decomposed at high temperature and some metal oxides are decomposed at normal temperature.
Metal oxides decompose on heating at the normal and high temperature and they form metal and oxygen. Here, HgO is decomposed at normal temperature. It decomposes in Hg metal and oxygen. Other metal oxides are decomposed at very high temperatures.
Hence, option (B) is the correct answer.

Additional information:
Metal oxides additives have been made into nonlinear resistors, which are called suppressing function. Metals are protected from further oxidation by forming a hard scale of oxides. While metal oxides nature is basic because it reacts with water to form bases. Metal oxide is used as a catalyst and has spacious applications in medicines.

Note: Metal oxides are decomposed by heating at different temperatures. Metal oxides are heating at high temperature or normal temperature. Here we must remember that given all metal oxides are decomposed by heating, but the one and only difference is temperature.