Question

Limestone under excessive heat and pressure changes into​

Answer 1

Answer:

Marble is the right answer.

Explanation:

Marble is a metamorphic rock that forms when limestone is subjected to the heat and pressure of metamorphism. It is composed primarily of the mineral calcite (CaCO3) and usually contains other minerals, such as clay minerals, micas, quartz, pyrite, iron oxides, and graphite. Under the conditions of metamorphism, the calcite in the limestone recrystallizes to form a rock that is a mass of interlocking calcite crystals. A related rock, dolomitic marble, is produced when dolostone is subjected to heat and pressure.

I hope you can understand this.

Answer 2

Answer:

limestone is calcium carbonate (CaCO3).

when calcium carbonate (limestone ) is heated it decomposes to form lime (CaO) and carbon dioxide (CO2).

it is a decomposition reaction.

CaCO3(s) + heat ------- CaO(s) + CO2 (g)

Explanation:

1. In this reaction one substance bos breaking into two similar substance , so it is a decomposition reaction . this reaction is very useful in various industries. this is because lime formed by the decomposition of lime stone has many uses in industries. for example it is used in large scale in the manufacture of cement and glass.
2. hope it is helpful for you.