Page 216 - Chemistry ICSE Class X

202 ICSE Chemistry – 10

Illustrative Questions

Q.1. A light and strong alloy is required for making the bodies of aircrafts. Name this alloy. What are its constituents?
Ans. The alloy used for making the bodies of aircrafts is Duralumin (or Duralium). Its composition is Al 95%, Cu 4%,
Mg 0.5%, Mn 0.5%.
Q.2. Name an alloy of
(i) aluminium used in the construction of aircrafts.

(ii) lead used in joining metals for electrical work.
(iii) copper used in household vessels.
Ans. (i) Duralumin is used for the construction of aircrafts.
(ii) Solder is the alloy of lead, which is used for joining metals for electrical
work. Gold is used in making jewellery
(iii) Brass is the alloy of copper that is used for making household vessels.

ASSIGNMENT 6

Alloys
ϭ͘ EĂŵĞ ƚŚĞ ĂůůŽLJ ĨŽƌŵĞĚ ďLJ ĐŽƉƉĞƌ ĂŶĚ njŝŶĐ͘
Ϯ͘ ƵƚĞŶƐŝů ŵĂĚĞ ŽĨ ďƌĂƐƐ ǁĂƐ ŬĞƉƚ ŝŶ Ă ŬŝƚĐŚĞŶ͘ ŌĞƌ ƐŽŵĞ ĚĂLJƐ͕ ƚŚĞ ƵƚĞŶƐŝů ůŽƐƚ ŝƚƐ ůƵƐƚƌĞ ĚƵĞ ƚŽ ƚŚĞ ĨŽƌŵĂƟŽŶ ŽĨ Ă
ŐƌĞĞŶŝƐŚ ůĂLJĞƌ ŽŶ ŝƚ͘ tŚĂƚ ĐŽƵůĚ ďĞ ƚŚĞ ĐĂƵƐĞ ĨŽƌ ƚŚŝƐ͍
ϯ͘ tŚŝĐŚ ĐŚĞŵŝĐĂů ĞůĞŵĞŶƚ ŝƐ ĂůůŽLJĞĚ ǁŝƚŚ ĐŽƉƉĞƌ ƚŽ ŵĂŬĞ ďƌŽŶnjĞ͍
ϰ͘ tŚĂƚ ĂƌĞ ƚŚĞ ĐŽŶƐƟƚƵĞŶƚƐ ŽĨ ĂŶ ĂůůŽLJ ĐĂůůĞĚ ͚ƐƚĂŝŶůĞƐƐ ƐƚĞĞů͍͛
ϱ͘ /Ŷ ƚŚĞ ĨĞĞĚ ĂŶĚ ĚĂŝƌLJ ŝŶĚƵƐƚƌLJ͕ Ă ƐƚƌŽŶŐ ĂůůŽLJ ŝƐ ƵƐĞĚ ĨŽƌ ŵĂŬŝŶŐ ĞƋƵŝƉŵĞŶƚƐ͘ dŚĞ ƐĂŵĞ ĂůůŽLJ ŝƐ ĂůƐŽ ƵƐĞĚ ŝŶ ŵĂŬŝŶŐ
ƵƚĞŶƐŝůƐ͘ EĂŵĞ ƚŚĞ ĂůůŽLJ ĂŶĚ ŐŝǀĞ ŝƚƐ ĐŽŵƉŽƐŝƟŽŶ͘
ϲ͘ Ŷ ĂůůŽLJ ƐŽůĚĞƌ ŝƐ ƵƐĞĚ ŝŶ ƚŚĞ ĞůĞĐƚƌŽŶŝĐ ŝŶĚƵƐƚƌLJ ƚŽ ũŽŝŶ ĚŝīĞƌĞŶƚ ĞůĞĐƚƌŽŶŝĐ ĐŽŵƉŽŶĞŶƚƐ͘ tŚĂƚ ĂƌĞ ƚŚĞ ĐŽŶƐƟƚƵĞŶƚƐ ŽĨ
ƐŽůĚĞƌ͍
ϳ͘ ůŝŐŚƚ ĂŶĚ ƐƚƌŽŶŐ ĂůůŽLJ ŝƐ ƌĞƋƵŝƌĞĚ ĨŽƌ ŵĂŬŝŶŐ ƚŚĞ ďŽĚŝĞƐ ŽĨ ĂŝƌĐƌĂŌƐ͘ tŚĂƚ ƐŚŽƵůĚ ďĞ ŝƚƐ ĐŽŶƐƟƚƵĞŶƚƐ͍
ϴ͘ tŚŝĐŚ ƚǁŽ ŵĂũŽƌ ĐŽŶƐƟƚƵĞŶƚƐ ĨŽƌŵ ƚŚĞ ĂůůŽLJ ĚƵƌĂůƵŵŝŶ͍

Let us Answer Some More Questions

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1. Which of the following is a metal: X or Y?
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9
2. Name one nonmetal and one metal which are in liquid state at room temperature.
3. Name two metals each which are more reactive and less reactive than hydrogen.
4. How does calcination differ from roasting?
5. Name the metals that can be obtained by carbon-reduction process.
6. Describe electrolytic reduction method for obtaining metals.

7. What is the role of lime (or limestone) in the extraction of iron?
8. The reaction of a metal X with Fe O is highly exothermic and is used to join railway tracks.
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(a) Identify metal X. (b) Write the chemical equation of its reaction with Fe O .
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9. Metal M occurs in the earth’s crust as its oxide M O . An alloy of this metal is used in making aircraft.
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(a) Name the ore of this metal containing M O .
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(b) Explain the steps taken to obtain this metal in a pure form from this ore.
(c) Draw a labelled diagram for the process.