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- 1. Multiple Choice
When the scandium reacts with water, the number of produced hydrogen moles is….
1
2
3
4
- 2. Multiple Choice
To produce car springs, vanadium is added to iron in
blast furnace or electric furnace
oxygen converter or blast furnace
medrix furnace or open furnace
Electric furnace or open furnace
- 3. Multiple Choice
which of the following alloys results from replacing an atom with another one of the same size and chemical properties...
Cu-Al / Ni –Al
Ni –Cr /steel
Al - Ni / Al –Cu
Fe-Cr / Au -Cu
- 4. Multiple Choice
The diagram express the progress of chemical reaction without using catalyst.
By using catalyst ….
The level of B and E rises
The level of B decreases
the level of A and D increases
the level of B and D decreases.
- 5. Multiple Choice
If the most suitable particles size for reduction process is 40-100 mm3 so all the following is correct except…
The reduction furnace may contains 15 mm3 particles
The particles which are 15 mm3 so it needs to be sintering
Crushing process produce 40 – 100 mm3 particles
30 mm3 particles need to be crushed
- 6. Multiple Choice
The …. Ionization energy is high for the non transition element which is used in duralumin alloy
First
second
third
forth
- 7. Multiple Choice
To plate an iron hand with brass alloy needs using container have…. Solution
ZnSO4 - FeSO4
Cu2+ - steel
Al+3 –Ni +2
CuSO4 - ZnSO4
- 8. Multiple Choice
If the most abundant element in the earth crust combined with 3d elements so, ………are formed
Alloys
metal carbonate
oxides
interstitial alloy
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