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  • Question
  • In paper manufacturing, degumming of the raw material is done using


  • Options
  • A. sulphuric acid
  • B. bleaching powder
  • C. caustic soda
  • D. nitric acid

  • Correct Answer
  • caustic soda 

    Explanation

    Paper production is basically a two-step process in which a fibrous raw material is first converted into pulp, and then the pulp is converted into paper. The harvestedwood is first processed so that the fibres are separated from the unusable fraction of the wood, the lignin. Pulp making can be done mechanically or chemically. In the chemical pulping process, alkali (e.g., sodium hydroxide in the form of a lye or caustic soda) is usually used to remove the lignin that binds the fibres. So, for degumming of raw material, caustic soda is used.

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    Chemistry problems


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    • 1. Potassium Permanganate is used for purifying drinking water, because________

    • Options
    • A. It is a reducing agent
    • B. It is an oxidising agent
    • C. It is a sterilising agent
    • D. It dissolves the impurities of water
    • Discuss
    • 2. In which of the following MgCl2 is soluble?

    • Options
    • A. Petrol
    • B. Acetone
    • C. Kerosene
    • D. Water
    • Discuss
    • 3. Which one of the following is an ohmic conductor?

    • Options
    • A. Germanium
    • B. Silicon
    • C. Carbon
    • D. Silver
    • Discuss
    • 4. The commonly used coolant in refrigerators is

    • Options
    • A. Ammonia
    • B. Nitrogen
    • C. Freon
    • D. Oxygen
    • Discuss
    • 5. The depletion in Ozone layer is caused by ___________ .

    • Options
    • A. Nitrous oxide
    • B. Carbon dioxide
    • C. Chlorofluorocarbons
    • D. Methane
    • Discuss
    • 6. Which of the following elements has the lowest melting point?

    • Options
    • A. Chromium
    • B. Hydrogen
    • C. Zinc
    • D. Silver
    • Discuss
    • 7. The process of depositing a layer of zinc on iron is called ___________

    • Options
    • A. Galvanisation
    • B. Crystallisation
    • C. Rusting
    • D. Baking
    • Discuss
    • 8. Which of the following statement is CORRECT?

    • Options
    • A. Gold and Silver are not ductile.
    • B. Phophorus and Nitrogen are ductile.
    • C. Copper and Platinum are ductile.
    • D. Sulphur and Phophorus are sonorous
    • Discuss
    • 9. The passage of an electric current through a conducting liquid causes ___________.

    • Options
    • A. Galvanisation
    • B. Evaporation
    • C. Physical Reaction
    • D. Chemical Reaction
    • Discuss
    • 10. Which of the following elements has the lowest melting point?

    • Options
    • A. Titanium
    • B. Sulphur
    • C. Argon
    • D. Zinc
    • Discuss


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