Chemical Engineering - Chemical Engineering Basics - Discussion

5. 

All of the following alloying elements of steel increases hardness but sacrifice ductility, except

[A]. nickel
[B]. vanadium
[C]. molybdenum
[D]. chromium

Answer: Option A

Explanation:

No answer description available for this question.

Dhananjay Singh said: (Feb 1, 2014)  
Nickel is silvery-white. Hard, malleable, and ductile metal. It is of the iron group and it takes on a high polish. It is a fairly good conductor of heat and electricity. In its familiar compounds nickel is bivalent, although it assumes other valences. It also forms a number of complex compounds. Most nickel compounds are blue or green. Nickel dissolves slowly in dilute acids but, like iron, becomes passive when treated with nitric acid. Finely divided nickel adsorbs hydrogen.

Chromium metal lacks ductility and is susceptible to nitrogen embrittlement, and is not used as a structural metal.

Manikandan said: (Jul 20, 2014)  
Nickel is a hard metal. Chromium metal is used for cement industry.

Nadeem said: (Dec 18, 2015)  
But nickle is known for its ductility. I think answer should be Cr as it provide hardness when alloyed.

Irfan said: (Nov 29, 2016)  
Nickel is silver-white, hard metal. Chromium metal lack ductility.

Labdhi said: (Mar 31, 2017)  
Nickel is hard and ductile. While Chromium is hard and brittle.

Abhinanadan Salagar said: (May 1, 2017)  
Here cr is used in steel to anti-corrosive element.

Ni is specific for ductility simple answer.

Pranayn said: (Aug 16, 2017)  
Nickel is silvery-white, Hard, malleable, and ductile metal. And It is of the iron group and it takes on a high polish. It is a fairly good conductor of heat and electricity. In its familiar compounds nickel is bivalent, although it assumes other valences. It also forms a number of complex compounds. Most nickel compounds are blue or green. Nickel dissolves slowly in dilute acids but, like iron, becomes passive when treated with nitric acid. Finely divided nickel adsorbs hydrogen.

Chromium metal lacks ductility and is susceptible to nitrogen embrittlement, and is not used as a structural metal.

Shah said: (Jul 22, 2018)  
Please explain the right answer.

Yahya said: (Aug 15, 2018)  
There are two things to discuss;

1)hardness 2) ductile.

Nickel alloy is the best option in comparison to others, nickel belongs to the transition metal and it is hard and ductile and its atomic number is 28.

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