GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Zinc oxide
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Zinc oxygen
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Either A or B
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None of the above
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Detailed explanation-1: -During combustion, a substance reacts with oxygen to form its oxide producing heat and light. Metals on reaction with oxygen from metal oxides. Zinc undergoes combustion producing zinc oxide as shown below: 2Zn+O2→2ZnO.
Detailed explanation-2: -Zinc reacts with oxygen to form zinc oxide.
Detailed explanation-3: -In the indirect (French) process, metallic zinc is melted in a furnace and vaporized at ca. 910 °C. The immediate reaction of the zinc vapour with oxygen from the air produces ZnO. The particles of zinc oxide are transported via a cooling duct and are collected at a bag filter station.
Detailed explanation-4: -It is a white powder that occurs in the form of zincite. As mentioned, the zinc oxide is thermo-chromic, it means there is a change in colour on heating the compound. Thus, when zinc oxide is heated in air, there is a change in colour from white to yellow, and when we cool it, it reverts back.