P' is a solid substance which is very hard. It is used in the construction industry as a
building material. Because of weathering mainly caused by acid rain, it is no longer used
for building purposes on its own, but only as a raw primary substance for building materials.
It is used in the purification of iron from iron ore in a blast furnace It is used as a raw
material in the refining of sugar from sugar beet. When substance P is heated strongly, it
decomposes to form another solid 'Q' and a gas 'R' is given out. Substance 'Q' is a, key
ingredient for the process of making cement. It is also used in the basic oxygen steel
making (BOS) process Solid 'Q' reacts with water with the release of a lot of heat to form
a substance 'S'. When gas 'R' is passed into a clear solution of substance 'S', then a
white precipitate of substance 'T' is formed. The substance 'T' has the same chemical
composition as starting substance 'P'.
(a) What is the substance 'P'? Write its common name as well as chemical formula
b) What is the substance 'Q' and gas 'R'?
c) What is the substance 'S'? What is its clear solution known as?
d) What is the substance 'T'? Name any two natural forms in which substance 'Tocours
in nature.
Answers
a). 'P' is calcium carbonate common name limestone. Chemical formula is CaCO3
b). 'Q' is calcium oxide and 'R' is carbon dioxide gas.
c). 'S' is calcium hydroxide, the clear solution is known as slaked lime.
d). Calcium hydroxide as white precipitate is formed. Limestone and chalk are two naturally occurring forms of calcium hydroxide.
Explanation:
a) CaCO3 when heated or undergoes thermal decomposition it forms CaO+CO2
Calcium oxide is solid, when reacts with water
CaO+H20 gives Ca(OH)2+heat (exothermic reaction)
The clear solution of calcium hydroxide is also called as slaked lime.
When carbon dioxide gas is passed to Calcium hydroxide it turns milky as calcium carbonate is formed. The starting chemical is same as the substance 'T' is also calcium carbonate. It occurs in nature as limestone and chalk. The lime present in it reacts with sulphur during acid rain hence it is not used in building as such.
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Answer: P- calcium carbonate
Explanation:
It is a solid substance which is used for construction purposes