The Composition Of A Sample Of Wustite Is Fe0.93 O. What Percentage Of The Iron Is Present In The Form Of  Fe III?

Why Kaysons ?

Video lectures

Access over 500+ hours of video lectures 24*7, covering complete syllabus for JEE preparation.

Online Support

Practice over 30000+ questions starting from basic level to JEE advance level.

Live Doubt Clearing Session

Ask your doubts live everyday Join our live doubt clearing session conducted by our experts.

National Mock Tests

Give tests to analyze your progress and evaluate where you stand in terms of your JEE preparation.

Organized Learning

Proper planning to complete syllabus is the key to get a decent rank in JEE.

Test Series/Daily assignments

Give tests to analyze your progress and evaluate where you stand in terms of your JEE preparation.

SPEAK TO COUNSELLOR ? CLICK HERE

Question

The composition of a sample of wustite is Fe0.93 O. What percentage of the iron is present in the form of  Fe III?

Solution

Correct option is

15.05%

 

From the valency of Fe (II) and Fe (III), it is clear that three Fe (II) ions will be replaced by two Fe (III) causing a loss of one iron ion. Total loss of iron from one molecule of FeO = 1 – 0.93 = 0.07

Hence, total Fe(III) present in one molecule of  

                  FeO = 2 × 0.07 = 0.14

Total number of Fe (II) and Fe (III) present in one molecule of

                  FeO = 0.93

Hence, percentage of Fe (III) = 

SIMILAR QUESTIONS

Q1

In a crystalline solid, having formula AB2O4, oxide ions are arranged in cubic close packed lattice while cations A are present in tetrahedral voids and cations B are present in octahedral voids. The percentage of tetrahedral voids occupied by A is     

Q2

Ag metal crystallises in a cubic closest packed arrangement with the edge of the unit cell having a length a = 407 pm. The radius of the similar atom is 

Q3

The density of solid argon is 1.65 g/mL at –233oC. If the argon atom is assumed to be sphere of radius 1.54 × 10–8 cm, what percentage of solid argon is apparently empty space?(At wt of Ar = 40).

Q4

A compound CuCl has fcc structure. Its density is 3.4 g cm–3, what is the length of unit cell?

Q5

A metal crystallizes into two cubic phases fcc and bcc whose unit cell lengths are 3.5 and 3.0 Å respectively. What is the ratio of densities of fcc and bcc?

Q6

The radius of a divalent cation M2+ is 94 pm and that of divalent anion X2–is 146 pm. Thus, M2+ X2– has

Q7

MgO has a structure of NaCl, the coordination number of O2– in MgO is

Q8

If NaCl is doped with 10–3 mol% of SrCl2, calculate the concentration of cation vacancies

Q9

The first order reflection of a beam of  X – rays of wavelength  from the (210) plane of a crystal of the simple cubic type, occurs at an angle of 11.290, the length of the unit cell is

Q10

A solid AB has the NaCI structure. If radius of cation A+ is 120 pm, the maximum possible value of the radius of the anion B- is