Page 221 - Chemistry ICSE Class X

Metallurgy 207

Questions from Board Papers

Q 1. Name the main constituent metals in the following alloys : [ICSE 2010]
(i) Duralumin (ii) Brass (iii) Stainless steel
Q 2. Choose from the following list of substances, as to what matches the description given below: [ICSE 2011]
[Acetylene gas, aqua fortis, coke, brass, barium chloride, bronze, platinum].
(i) A black powdery substance used for the reduction of zinc oxide during its extraction.
(ii) The substance is an alloy of zinc, copper and tin.
Q 3. Answer the following questions: [ICSE 2011]
(i) Name a metal which is found abundantly in the earth’s crust.
(ii) What is the difference between calcination and roasting?
(iii) Name the process used for the enrichment of sulphide ore.
(iv) Write the chemical formulae of one main ore of iron and aluminium.
(v) Write the constituents of electrolyte for the extraction of aluminium.
Q 4. Match the properties and uses of alloys in List 1 with the appropriate answer from List 2. [ICSE 2012]
List 1 List 2
1. The alloy contains Cu and Zn, is hard, silvery and is used in decorative articles. A. Duralumin
2. It is stronger than Aluminium, light and is used in making light tools. B. Brass
3. It is lustrous, hard, corrosion resistant and used in surgical instruments. C. Bronze
4. Tin lowers the melting point of the alloy and is used for soldering purpose. D. Stainless steel
5. The alloy is hard, brittle, takes up polish and is used for making statues. E. Solder
Q 5. (a) Name a metal present in cryolite other than sodium. [ICSE 2012]
(b) The following questions are relevant to the extraction of Aluminium:
K 5VCVG VJG TGCUQP HQT CFFKVKQP QH ECWUVKE CNMCNK VQ DCWZKVG QTG FWTKPI RWTKſECVKQP QH DCWZKVG
(ii) Give a balanced chemical equation for the above reaction.
(iii) Along with cryolite and alumina, another substance is added to the electrolyte mixture.
Name the substance and give one reason for the addition.
Q 6. Choose the most appropriate answer from the following options: [ICSE 2013]
The metals zinc and tin are present in the alloy:
(A) Solder (B) Brass (C) Bronze (D) Duralumin
Q 7. The following questions relate to the extraction of aluminium by electrolysis: [ICSE 2013]
(i) 0COG VJG QVJGT CNWOKPKWO EQPVCKPKPI EQORQWPF CFFGF VQ CNWOKPC CPF UVCVG KVU UKIPKſECPEG
(ii) Give the equation for the reaction that takes place at the cathode.
(iii) Explain why is it necessary to renew the anode periodically.
Q 8. Choose the correct answer from the options given below: [ICSE 2014]
(i) The main ore used for the extraction of iron is:
(A) Haematite (B) Calamine (C) Bauxite (D) Cryolite
(ii) Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point
is known as:
(A) smelting (B) ore dressing (C) calcination (D) bessemerisation
Q 9. State the main components of the following alloys: [ICSE 2014]
(i) Brass (ii) Duralumin (iii) Bronze
Q 10. Name the following: [ICSE 2014]
(i) A compound added to lower the fusion temperature of electrolytic bath in the extraction of aluminium.
(ii) The ore of zinc containing its sulphide.
Q 11. Choose the most appropriate answer for the following: [ICSE 2015]
This is not an alloy of copper:
(A) Brass (B) Bronze (C) Solder (D) Duralumin