Interview question based on skill :
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Total Questions: 20
1. The process of deterioration of a metal due to unwanted chemical or electrochemical interaction of the metal with its environment is called
Correct Answer is : Corrosion
2. Which of the following is an example of corrosion?
Correct Answer is : Rusting of iron and tarnishing of silver
3. How many rust will be formed when 100kg of iron have completely rusted away?
Correct Answer is : 190 kg
4. Metals does not exist in nature in the form of
Correct Answer is : Nitrates
5. Which of the following is the most stable state of metal?
Correct Answer is : Ore of metal
6. In corrosion, as a result of decay, the metals are not converted into __________
Correct Answer is : Peroxides
7. The metals except ________ exist in nature in the form of their minerals or ores.
Correct Answer is : Gold
8. Iron undergoes corrosion to produce __________ coloured hydrated ferric oxide.
Correct Answer is : Brown
9. The corrosion is the reverse process of ____________
Correct Answer is : Metal extraction
10. The amount of iron wasted by corrosion each year is estimated about _________ of its annual production.
Correct Answer is : 45295
11. Nickel metal hydrated batteries having the low cell voltage of __________
Correct Answer is : 1.2V
12. The advantages of the nickel metal hydrated batteries are having _________ more energy than the nickel cadmium batteries.
Correct Answer is : 0.75
13. In zinc-air cells are composed of three parts of zinc used as ___________
Correct Answer is : Anode
14. The drawback of this battery is the working voltage of battery is _________ due to the internal losses.
Correct Answer is : Lower
15. The emf of the anode in zinc-air batteries is ___________
Correct Answer is : -1.25V
16. The emf of the cathode in the zinc-air batteries is __________
Correct Answer is : 0.4V
17. Dry corrosion is also called as_________
Correct Answer is : Chemical corrosion
18. Anhydrous inorganic liquid metal surface in absence of moisture undergoes ___________
Correct Answer is : Dry corrosion
19. The rusting iron is the __________
Correct Answer is : Oxidation corrosion
20. Chemical action of flowing liquid metal at high temperatures is __________
Correct Answer is : Liquid metal corrosion
