Chemical Engineering Answers

A German fuel blend called Reichkraftskoff is made up of 50% motor benzole (75% benzene, 15% toluene, 10% xylene), 25% tetralin (C10H12) and 25% industrial alcohol (80% ethanol, 20% methanol). After combustion in excess air, a stack gas containing 9.13% CO2 and 1.83% CO is obtained.

The % exess air is about

The % O2 in the dry stack gas is about

The value of the second ionisation energy of calcium is 1150KJ.mol-1
Which equation correctly represent this statement?
A. Ca^+(g) = Ca^2+(g) + e^-
Delta = +1150KJ.mol-1
B. Ca(g) = Ca^2+(g) + 2^e^-
Delta = +1150KJ.mol-1
C. Ca^+(g) = Ca^2+(g) + e^-
Delta = -1150KJ.mol-1
D. Ca(g) = Ca^2+(g) + 2e^-
Delta = -1150KJ.mol-1

When copper os extracted from its ore, the metal is not pure enough for electrical uses. The impure copper, which contains small amount of silver and gold, is purified by electrolysis. During this process, a "sludge" forms beneath the anode, which is found to contain silver and traces of Gold. Why is the silver found in this sludge?
A. Silver reacts with electrolyte to form an insoluble sulphate salt.
B. Silver is more dense than copper and falls off the cathode
C. Silver reacts with electrolyte to form an insoluble chloride salt
D. Silver is less electropositive than copper

Cuprammonium ion [Cu(NH3)4]^2+ is?
A. Square planar
B. Tetrahedral
C. Octahedral
D. Triangular bipyramidal

Which one of the following has square planar geometry?
A. [Ag(NH3)2]^+
B. [Cu(en)2]^2+
C. [MnCl4]^2-
D. [Ni(CO)4]

In the complex compound K4[Ni(CN)4], what is the oxidation state of nickel?
A. -1
B. 0
C. +1
D. +2

What is the IUPAC name of [Co(NH3)3(NO2)3]
A. Trinitrotriamminecobalt(iii)
B. Trinitrotriamminecobalt(iii) ion
C. Trinitrotriamminecobaltate(iii)
D. Trinitrotriamminecobalt(ii)

What is the correct formula of diamminesilver chloride?
A. Ag(NH2)Cl
B. Ag(NH3)Cl
C. [Ag(NH2)2]Cl
D. [Ag(NH3)2]Cl

Potassium ferrocyanide is an example of;
A. Linear
B. Square planar
C. Tetrahedral
D. Octahedral

Ethylene diamine is an example of;
A. Monodentate ligand
B. Bidentate ligand
C. Tridentate ligand
D. Hexadentate ligand