This set of Applied Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Corrosion”.
1. In corrosion, as a result of decay, the metals are not converted into __________
Explanation: In corrosion, as a result of decay the metals are not converted into peroxide. They are converted into the oxides, hydroxides, carbonates and sulphides.
2. The metals except ________ exist in nature in the form of their minerals or ores.
Explanation: Most of the metals except gold and platinum exist in nature in the form of their minerals or ores, in the stable combine forms as oxide, chlorides etc.
3. Iron undergoes corrosion to produce __________ coloured hydrated ferric oxide.
Explanation: Iron undergoes corrosion to produce the brown coloured hydrated ferric oxide which is nothing but rust on the surface of the metal.
4. The corrosion is the reverse process of ____________
a) Metal extraction
b) Metal production
c) Metal heating
d) Metal moulding
Explanation: The corrosion is the reverse process of the metal extraction. In the pure form, metal possess the engineering properties like malleability, ductility etc.
5. Which of the following is not lost during corrosion?
6. The amount of iron wasted by corrosion each year is estimated about _________ of its annual production.
Explanation: The amount of the iron wasted yearly is about 1/4 of its annual production. The iron is lost by forming its compounds in the process of corrosion.
7. Nickel metal hydrated batteries having the low cell voltage of __________
Explanation: Nickel metal hydrated batteries are having very low cell voltages. It is having the voltage of 1.2V.
8. The advantages of the nickel metal hydrated batteries are having _________ more energy than the nickel cadmium batteries.
Explanation: The advantages of the nickel metal hydrated batteries are having 50% more energy than the nickel cadmium batteries.
9. In zinc-air cells are composed of three parts of zinc used as ___________
c) Based on the half cell
d) Can’t be said
Explanation: Zinc-air cells are composed of three parts of zinc used as anode, an air electrode is used as the cathode.
10. The drawback of this battery is the working voltage of battery is _________ due to the internal losses.
d) Not considerable
Explanation: The drawback of this battery is the working voltage of battery is lower due to the internal losses in the zinc-air batteries.
11. The emf of the anode in zinc-air batteries is ___________
Explanation: The electromotive force of the anode in zinc-air batteries is -1.25. The anode is having negative potential.
12. The emf of the cathode in the zinc-air batteries is __________
Explanation: The electromotive force of the cathode of the zinc-air batteries is 0.4V. The cathode has the positive potential and the oxygen acts as the cathode.
Sanfoundry Global Education & Learning Series – Applied Chemistry.
To practice all areas of Applied Chemistry, here is complete set of 1000+ Multiple Choice Questions and Answers.