A sample of an iron and oxygen ore has a mass of 35.8 grams. The iron in the compound has a mass of 27.9 grams. What is the percent iron in the ore?
A. 74% Fe
B. 75% Fe
C. 77% Fe
D. 78% Fe
A. 74% Fe
B. 75% Fe
C. 77% Fe
D. 78% Fe
A. C2H6O
B. C6H18O3
C. C6H12O6
D. C2H5O
A. C2H4
B. C3H6
C. C4H8
D. C5H10
A. 1.8 gram of H2O
B. 12 moles of KMnO4
C. 0.6N H2SO4
D. 4.6 gram of C2H5OH
A. 30 KJ
B. 1 KJ
C. 39 KJ
D. 29 KJ
The heat energy produced when the human body metabolises 1 gram of fat is__________? Read More »
Chemistry Mcqs A. Greenhouse effect
B. Fire in coal mines
C. Dry farming
D. Monsoon
Which of the following phenomenon is considered responsible for Global Warming? Read More »
Chemistry Mcqs A. p-electrons in Ne(Z = 10)
B. s-electrons in Mg(Z = 12)
C. d-electrons in Fe(Z = 26)
D. p-electrons in CI(Z = 17)
The number of d-electrons in Fe2+ (Z = 26) is not equal to that of____________? Read More »
Chemistry Mcqs A. smelting
B. roasting
C. calcinations
D. froth floatation
A. H2 at -73oC
B. CH4 at 300 K
C. N2 at 1,027oC
D. O2 at 0oC
The molecules of which gas have highest speed? Read More »
Chemistry Mcqs A. Dalton’s law
B. Gay Lussac’s law
C. Henry’s law
D. Raoult’s law