Assertion :Aluminium foils are used in packaging. Reason: Aluminium foil acts as a total barrier to light and oxygen (which causes fats to oxidise or become rancid), odours and flavours, moistness, and germs, and so it is used broadly in food and pharmaceutical packaging.
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Assertion is correct but Reason is incorrect
Both Assertion and Reason are incorrect
A
Assertion is correct but Reason is incorrect
B
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
C
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
D
Both Assertion and Reason are incorrect
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Solution
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Aluminium foil (or aluminum foil) is aluminium prepared in thin metal leaves with a thickness less than 0.2 millimetres (8 mils); thinner gauges down to 6 micrometres (0.24 mils) are also commonly used.
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Q1
Assertion :Aluminium foils are used in packaging. Reason: Aluminium foil acts as a total barrier to light and oxygen (which causes fats to oxidise or become rancid), odours and flavours, moistness, and germs, and so it is used broadly in food and pharmaceutical packaging.
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Q2
Assertion – The non-fusible impurities present in iron ore are removed by CaCO3 .
Reason: CaCO3 which decomposes into CaO and CO2. The CaO formed reacts with SiO2 to remove silica
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Q3
Assertion: Aluminium is used as a reducing agent in the extraction of chromium from its oxide, Cr2O3. Reason: Reduction by Aluminium is known as Gold Schmidt thermite process or Aluminothermic process.
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Q4
Assertion If BOD level of water in reservoir is less than 5 ppm it is not polluted.
Reason High biological oxygen demand means low activity of bacteria in water.
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Q5
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