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Iron and Its Compounds



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Q1. __________ is a eutectic mixture of ? iron and Fe3C.

(a) Pearlite
(b) Martensite
(c) Ledeburite
(d) Sorbite

Q2. ___________ is a mixture of radial lamellae of ferrite and cementite.

(a) Troostite
(b) Ferrite
(c) Martensite
(d) Sorbite

Q3. Cementite is magnetic up to ________

(a) 100oC
(b) 250oC
(c) 600oC
(d) 850oC

Q4. Which of the following is a nonmagnetic iron?

(a) Ferrite
(b) Austenite
(c) Cementite
(d) Alnico

Q5. Which of the following is applicable to ? iron?

(a) Soft
(b) Ductile
(c) Magnetic
(d) Can be hot worked

Q6. At what temperature range is ? iron stable?

(a) Up to 908oC
(b) 908-1388oC
(c) 1388-1535oC
(d) 1535-1800oC

Q7. What is the crystal structure of ? iron?

(a) Body-centered cubic
(b) Face-centered cubic
(c) Hexagonal closely packed
(d) Body-centered tetrahedral

Q8. Pure iron exists in ________ allotropic forms.

(a) One
(b) Two
(c) Three
(d) Four

Q9. The existence of two or more crystal structures for any substance, depending on temperature, is known as _________

(a) Allotropy
(b) Solidification
(c) Solubility
(d) Interstices

Q10. Alloys containing 2.0-6.7% carbon are considered as __________

(a) Steel
(b) Cast-iron
(c) Aluminum
(d) Brass


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Four Successive Members Of The First Row Transition Elements Are Listed Below With Their Atomic Numbers. Which One Of Them Is Expected To Have The Highest Third Ionization Enthalpy

Modified 250 Year Ago

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250 Year Ago

Four Successive Members Of The First Row Transition Elements Are Listed Below With Their Atomic Numbers. Which One Of Them Is Expected To Have The Highest Third Ionization Enthalpy

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305 views

Highest (+7) Oxidation State Is Shown By

Modified 252 Year Ago

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252 Year Ago

Highest (+7) Oxidation State Is Shown By

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282 views

The Outer Electron Configuration Of Gd (At. No. 64) Is

Modified 321 Year Ago

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321 Year Ago

The Outer Electron Configuration Of Gd (At. No. 64) Is

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272 views

A Metal Gets Coated With A Green Basic Carbonate When Exposed At Atmosphere. Metal Is

Modified 16 Year Ago

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16 Year Ago

A Metal Gets Coated With A Green Basic Carbonate When Exposed At Atmosphere. Metal Is

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247 views

A Transition Element X Has A Configuration [Ar]3d4 In Its + 3 Oxidation State. Its Atomic Number Is

Modified 250 Year Ago

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250 Year Ago

A Transition Element X Has A Configuration [Ar]3d4 In Its + 3 Oxidation State. Its Atomic Number Is

0 votes
0 Answer
243 views

The General Electronic Configuration Of Transition Elements Is

Modified 252 Year Ago

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252 Year Ago

The General Electronic Configuration Of Transition Elements Is

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