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Question

Describe the importance of the following : (i) limestone (ii) cement (iii) plaster of paris.

Solution
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(i) Limestone is used
(a) as a building material in the form of marble.
(b) in the preparation of quicklime.
(c) as a raw material in ammonia soda process for the manufacture of sodium carbonate.
(d) as a constituent of toothpaste.
(e) as a filler in cosmetics.
(ii) Cement is used in
(a) concrete and reinforced concrete.
(b) plastering.
(c) the construction of buildings, bridges , dams, etc.
(iii) Plaster of paris is used
(a) in building industry.
(b) in plasters.
(c) for making statues, models and other decorative materials.
(d) in surgical bandages (plasters) for immobilizing the fractured base in the body.

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Similar Questions
Q1
Choose the correct answer form the alternatives given.
Match the column I with column II and mark the appropriate choice.

Column I
Column II
(A)Quick lime (i)Setting fractured bones
(B)Plaster of Paris(ii)A constituent of chewing gum
(C)Slaked lime (iii)Manufacture of bleaching powder
(D)Limestone(iv)Manufacture of dyestuffs

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Q2

Importance of plaster of Paris with definition and with marks.

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Q3

(a) What is plaster of Paris? Write the chemical formula of plaster of Paris.

(b) How is plaster of Paris prepared? Write the chemical equation of the reaction involved.

(c) Explain why plaster of Paris should be stored in a moisture-proof container.

(d) State two important uses of plaster of Paris.

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Q4
Match the following columns.
Column (I) Column(II)
(1) Plaster of Paris(i) Ca(OH)2
(2) Gypsum (ii) CaSO4.12H2O
(3) Bleaching powder(iii) CaSO4.2H2O
(4) Slaked lime(iv) CaOCl2

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Q5
Match List - I with List - II for the compositions of substances and select the correct answer using the code given below the list:
List - I List - II
Substances Composition
(A) Plaster of paris (i) CaSO42H2O
(B) Epsomite (ii) CasO412H2O
(C) Kieserite (iii) MaSO47H2O
(D) Gypsum (iv) MgSO4H2O
(v) CaSO4
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