Preference

প্রশ্নঃ

Soda-lime is-

  1. ক.

    NaOH.2H2O

  2. খ.

    NaOH.CaO

  3. গ.

    NaOH.NaO

  4. ঘ.

    CaO.NaO

উত্তরঃ
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