A solid substance P which is very hard is used in the construction of many buildings, especially flooring. when substance P is heated strongly, it decomposes to form another solid Q and a gas R is given out. Solid Q reacts with water water 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 precipitable of substance T is formed . The substance T has the same chemical composition as starting substance P.

(a) What is substance P ? Write its common name as well as chemical formula.

(b) What is substance Q ?

(c) What is gas R ?

(d) What is substance S ? What is its clear solution known as ?

(e) What is bustance T ? Name any two natural forms in which substance T occurs in nature.

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Solution

(a) Calcium carbonate, limestone, $C a C O_{3}$
(b) Calcium oxide, $C a O$
(c) Carbon dioxide, $C O_{2}$
(d) Calcium hydroxide, $C a (O H)_{2}$ ;Lime water
(e) Calcium carbonate ; Limestone and Marble

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(a) Calcium carbonate, limestone, CaCO3 (b) Calcium oxide, CaO (c) Carbon dioxide, CO2 (d) Calcium hydroxide, Ca(OH)2 ;Lime water (e) Calcium carbonate ; Limestone and Marble

(a) Calcium carbonate, limestone, $C a C O_{3}$
(b) Calcium oxide, $C a O$
(c) Carbon dioxide, $C O_{2}$
(d) Calcium hydroxide, $C a (O H)_{2}$ ;Lime water
(e) Calcium carbonate ; Limestone and Marble