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Chapter 8: Problem 27

"Alclad" is perfectly resistant to corrosion by sea water. The alloy is (a) magnalium coated with aluminium (b) duralumin coated with aluminium (c) r-alloy duralumin (d) a mixture of magnalium and duralumin

Short Answer

Expert verified
Answer: Alclad is duralumin coated with aluminum, which provides the strength of duralumin and the corrosion resistance of pure aluminum, making it highly resistant to corrosion in environments with sea water.

Step by step solution

01

Research Alclad

To find the correct answer, we need to research and understand what Alclad is. Alclad is an aluminum alloy that is specifically designed to be highly resistant to corrosion in environments with sea water. It is created by bonding a pure aluminum layer to an aluminum alloy substrate (base material).
02

Analyze Option (a) - Magnalium coated with Aluminum

Magnalium is an alloy made from magnesium and aluminum. While it has several useful properties, it is not used for providing corrosion resistance against sea water. Option (a) is not the correct answer.
03

Analyze Option (b) - Duralumin coated with Aluminum

Duralumin is an aluminum alloy that contains copper, manganese, and magnesium. It is known for its high strength and light weight. By coating duralumin with a layer of pure aluminum, we obtain Alclad, which has the strength of duralumin and the corrosion resistance of pure aluminum. Option (b) is the correct answer.
04

Analyze Option (c) - r-alloy Duralumin

r-alloy duralumin refers to a specific type of duralumin. However, it does not specifically denote an alloy with corrosion resistance against sea water, so option (c) cannot be the correct answer.
05

Analyze Option (d) - Mixture of Magnalium and Duralumin

Mixing magnalium and duralumin combines the properties of both alloys, but does not create a material that is specifically resistant to corrosion by sea water. Option (d) is not the correct answer.
06

Choose the correct description

After analyzing all the options, we can conclude that option (b), duralumin coated with aluminum is indeed the best description of Alclad. This is because Alclad is known for its corrosion resistance against sea water, which is obtained by coating duralumin with a layer of pure aluminum.

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Most popular questions from this chapter

A quantity of \(10 \mathrm{~g}\) of a mixture of \(\mathrm{C}_{2} \mathrm{H}_{6}\) and \(\mathrm{C}_{5} \mathrm{H}_{10}\) occupy \(4480 \mathrm{ml}\) at \(1 \mathrm{~atm}\) and \(273 \mathrm{~K}\). The percentage of \(\mathrm{C}_{2} \mathrm{H}_{6}\) by mass, in the mixture is (a) \(30 \%\) (b) \(70 \%\) (c) \(50 \%\) (d) \(60 \%\)

A gaseous mixture contains \(40 \% \mathrm{H}_{2}\) and \(60 \% \mathrm{He}\), by volume. What is the total number of moles of gases present in \(10 \mathrm{~g}\) of such mixture? (a) 5 (b) \(2.5\) (c) \(3.33\) (d) \(3.125\)

The empirical formula of an organic gaseous compound containing carbon and hydrogen is \(\mathrm{CH}_{2}\). The volume occupied by certain mass of this gas is exactly half of the volume occupied by the same mass of nitrogen gas under identical conditions. The molecular formula of the organic gas is (a) \(\mathrm{C}_{2} \mathrm{H}_{4}\) (b) \(\mathrm{CH}_{2}\) (c) \(\mathrm{C}_{6} \mathrm{H}_{12}\) (d) \(\mathrm{C}_{4} \mathrm{H}_{8}\)

A mixture of methane and ethylene in the ratio of a:b by volume occupies \(30 \mathrm{ml}\). On complete combustion, the mixture yield \(40 \mathrm{ml}\) of \(\mathrm{CO}_{2} .\) What volume of \(\mathrm{CO}_{2}\) would have been obtained if the ratio would have been b:a? (a) \(50 \mathrm{ml}\) (b) \(30 \mathrm{ml}\) (c) \(40 \mathrm{ml}\) (d) \(60 \mathrm{ml}\)

Hydrogen cyanide, HCN, is prepared from ammonia, air and natural gas \(\left(\mathrm{CH}_{4}\right)\) by the following process. \(2 \mathrm{NH}_{3}(\mathrm{~g})+3 \mathrm{O}_{2}(\mathrm{~g})+2 \mathrm{CH}_{4}(\mathrm{~g}) \stackrel{\mathrm{Pt}}{\longrightarrow}\) \(2 \mathrm{HCN}(\mathrm{g})+6 \mathrm{H}_{2} \mathrm{O}(\mathrm{g})\) If a reaction vessel contains \(11.5 \mathrm{~g} \mathrm{NH}_{3}\), \(10.0 \mathrm{~g} \mathrm{O}_{2}\), and \(10.5 \mathrm{~g} \mathrm{CH}_{4}\), what is the maximum mass, in grams, of hydrogen cyanide that could be made, assuming the reaction goes to completion? (a) \(18.26 \mathrm{~g}\) (b) \(5.625 \mathrm{~g}\) (c) \(17.72 \mathrm{~g}\) (d) \(16.875 \mathrm{~g}\)
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