5. Which treatment is frequently used to protect aluminium articles from subsequent erosion? A. Making aluminium the anode during electrolysis. B. Dipping the aluminium in hot aqueous sodium hydroxide. C. Dipping the aluminium in molten cryolite. D. Coating the aluminium with a less reactive metal.
5. Which treatment is frequently used to protect aluminium articles from subsequent erosion? A. Making aluminium the anode during electrolysis. B. Dipping the aluminium in hot aqueous sodium hydroxide. C. Dipping the aluminium in molten cryolite. D. Coating the aluminium with a less reactive metal.
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Science behind corrosion-test
Corrosion is defined as an activity that transforms refined metals into more chemically stable forms such as oxide, hydroxide, carbonate, or sulfide. It refers to the slow decomposition of things (typically metals); thanks to chemical and/or electrochemical reactions with their surroundings. Corrosion engineering is the science of preventing and controlling corrosion.
Corrosion
Corrosion is defined as an activity that transforms refined metals into more chemically stable forms such as oxide, hydroxide, carbonate, or sulfide. It refers to the slow decomposition of things (typically metals); thanks to chemical and/or electrochemical reactions with their surroundings. Corrosion engineering is the science of preventing and controlling corrosion.
Question
Transcribed Image Text:5.
Which treatment is frequently used to protect aluminium articles from subsequent erosion?
A. Making aluminium the anode during electrolysis.
B. Dipping the aluminium in hot aqueous sodium hydroxide.
C. Dipping the aluminium in molten cryolite.
D. Coating the aluminium with a less reactive metal.
Which of the following is not a use of silicones?
A. Waterproofing.
B. Lubricants.
C. Computer chips.
D. Implants.
7.
Which of the following statements, comparing the physical properties of calcium and
nickel is correct?
(i)
The melting point of calcium is lower than that of nickel.
(ii)
Calcium has a much higher density than nickel.
(iii)
Calcium does not behave as a catalyst whereas nickel does.
A. (i), (ii) and (iii) are correct.
B. (ii) and (iii) are correct.
C. (iii) is correct.
D. (i) and (iii) are correct.
8.
Two allotropic forms of sulphur are rhombic and monoclinic. Which of the statements
below is not true?
A. They both dissolve in nonpolar solvents such as benzene.
B. They both react with oxygen gas to form sulphur dioxide gas.
C. They have the same melting and boiling points.
D. They both have simple molecular lattices.
4 }
9.
Which of the following best explains the properties of a transition element?
A. An element which is very hard, dense, and has a high melting point.
B. An element which has a partly filled 'd' subshell and electrons in the 4s subshell.
C. An element which shows more than one oxidation state and forms coloured compounds.
D. A 'd' block element which forms at least one ion with a partially filled 'd' subshell.
10.
The pie chart shown in Figure 1 below represents the use of chlorine and its compounds in
the country Essos. If the sectors shown by the letters A, D and E represent herbicides,
polymers and aerosols respectively, which one of the following would Sector C most likely
not represent?
A. Sterilising drinking water.
B. Food preservatives.
C. Pesticides.
D. Bleaches.
6.
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