Multiple Choice Questions on Whitewashed walls appear to be shiny after three to four days due to the formation of ........ for SSC (MTS) Preparation

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Multiple Choice Questions

Whitewashed walls appear to be shiny after three to four days due to the formation of ........

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    Whitewashed walls appear to be shiny after three to four days due to the formation of:

    This questions was previously asked in
    SSC MTS 20th October 2021 Shift-3
    View All SSCMTS Previous Year Papers

    calcium nitrate

    Incorrect Answer

    calcium sulphate

    Incorrect Answer

    calcium oxide

    Incorrect Answer

    calcium carbonate

    Correct Answer
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    Explanation:

    calcium carbonate

    - Lime (calcium oxide) is used in whitewashing.
    - When applied, **calcium oxide** (option:3) reacts with water to form calcium hydroxide.
    - This calcium hydroxide then reacts with carbon dioxide in the air.
    - It forms **calcium carbonate** (option:4), which is the shiny layer observed after a few days.
    - Option:1, calcium nitrate, and option:2, calcium sulphate are not part of this process.

    **✅ Option:4 - calcium carbonate is correct.**

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