Home/ Sadhna/Answers
  1. Asked: In:

    Write the name and formula of 2nd member of homologous series having general formula CₙH₂ₙ.

    Sadhna

    Get Hindi Medium and English Medium NCERT Solution for Class 10 Science to download. Please follow the link to visit website for first and second term exams solutions. https://www.tiwariacademy.com/ncert-solutions/class-10/Science/chapter-4/

    Get Hindi Medium and English Medium NCERT Solution for Class 10 Science to download.
    Please follow the link to visit website for first and second term exams solutions.
    https://www.tiwariacademy.com/ncert-solutions/class-10/Science/chapter-4/

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    • 2
  2. Asked: In:

    Reactivity of aluminium decreases if it is dipped in nitric acid explain. Metal like Calcium and magnesium are never found in their free state. Explain sodium chloride is an ionic compound which does not conduct electricity in solid state whereas it does conduct electricity in molten state as well as in aqueous solution.

    Sadhna

    Get Hindi Medium and English Medium NCERT Solution for Class 10 Science to download. Please follow the link to visit website for first and second term exams solutions. https://www.tiwariacademy.com/ncert-solutions/class-10/Science/chapter-3/

    Get Hindi Medium and English Medium NCERT Solution for Class 10 Science to download.
    Please follow the link to visit website for first and second term exams solutions.
    https://www.tiwariacademy.com/ncert-solutions/class-10/Science/chapter-3/

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    • 1
  3. Asked: In:

    Write chemical equation for followings: – Calcium metal reacts with water. Cinnabar metal Reacted in presence of air manganese dioxide is reacted with aluminum powder.

    Sadhna

    Get Hindi Medium and English Medium NCERT Solution for Class 10 Science to download. Please follow the link to visit website for first and second term exams solutions. https://www.tiwariacademy.com/ncert-solutions/class-10/Science/chapter-3/

    Get Hindi Medium and English Medium NCERT Solution for Class 10 Science to download.
    Please follow the link to visit website for first and second term exams solutions.
    https://www.tiwariacademy.com/ncert-solutions/class-10/Science/chapter-3/

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    • 1
  4. Asked: In:

    A metal M is found in the form of sulphur M₂S, and is good conductor of electricity and is used in making wires. Identify the metal M and write the steps involved in extraction of this metal.

    Sadhna

    Get Hindi Medium and English Medium NCERT Solution for Class 10 Science to download. Please follow the link to visit website for first and second term exams solutions. https://www.tiwariacademy.com/ncert-solutions/class-10/Science/chapter-3/

    Get Hindi Medium and English Medium NCERT Solution for Class 10 Science to download.
    Please follow the link to visit website for first and second term exams solutions.
    https://www.tiwariacademy.com/ncert-solutions/class-10/Science/chapter-3/

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    • 0
  6. Asked: In:

    Define concentration of ore? Write ore of mercury and copper.

    Sadhna

    Get Hindi Medium and English Medium NCERT Solution for Class 10 Science to download. Please follow the link to visit website for first and second term exams solutions. https://www.tiwariacademy.com/ncert-solutions/class-10/Science/chapter-3/

    Get Hindi Medium and English Medium NCERT Solution for Class 10 Science to download.
    Please follow the link to visit website for first and second term exams solutions.
    https://www.tiwariacademy.com/ncert-solutions/class-10/Science/chapter-3/

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    • 1
  7. Asked: In:

    Sodium is lightly reactive metal. It can not be obtained with heating with carbon. Give reason for it. How sodium is obtained from sodium chloride.

    Sadhna

    Get Hindi Medium and English Medium NCERT Solution for Class 10 Science to download. Please follow the link to visit website for first and second term exams solutions. https://www.tiwariacademy.com/ncert-solutions/class-10/Science/chapter-3/

    Get Hindi Medium and English Medium NCERT Solution for Class 10 Science to download.
    Please follow the link to visit website for first and second term exams solutions.
    https://www.tiwariacademy.com/ncert-solutions/class-10/Science/chapter-3/

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    • 1
  8. Asked: In:

    Give reasons: Silver article becomes black after some time.

    Sadhna

    Get Hindi Medium and English Medium NCERT Solution for Class 10 Science to download. Please follow the link to visit website for first and second term exams solutions. https://www.tiwariacademy.com/ncert-solutions/class-10/Science/chapter-3/

    Get Hindi Medium and English Medium NCERT Solution for Class 10 Science to download.
    Please follow the link to visit website for first and second term exams solutions.
    https://www.tiwariacademy.com/ncert-solutions/class-10/Science/chapter-3/

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    • 1
  9. Asked: In:

    Give reasons: Zn can desplace copper from CuSO₄ solution colour of solution in four test tubes ore green, yellow, blue and colourless. Which has ZnSO₄ solution?

    Sadhna

    Get Hindi Medium and English Medium NCERT Solution for Class 10 Science to download. Please follow the link to visit website for first and second term exams solutions. https://www.tiwariacademy.com/ncert-solutions/class-10/Science/chapter-3/

    Get Hindi Medium and English Medium NCERT Solution for Class 10 Science to download.
    Please follow the link to visit website for first and second term exams solutions.
    https://www.tiwariacademy.com/ncert-solutions/class-10/Science/chapter-3/

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    • 1
  11. Asked: In:

    What are alloys? List two properties of alloys.

    Sadhna

    Get Hindi Medium and English Medium NCERT Solution for Class 10 Science to download. Please follow the link to visit website for first and second term exams solutions. https://www.tiwariacademy.com/ncert-solutions/class-10/Science/chapter-3/

    Get Hindi Medium and English Medium NCERT Solution for Class 10 Science to download.
    Please follow the link to visit website for first and second term exams solutions.
    https://www.tiwariacademy.com/ncert-solutions/class-10/Science/chapter-3/

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    • 1
  12. Asked: In:

    What is the difference between a mineral and an ore?

    Sadhna

    Get Hindi Medium and English Medium NCERT Solution for Class 10 Science to download. Please follow the link to visit website for first and second term exams solutions. https://www.tiwariacademy.com/ncert-solutions/class-10/Science/chapter-3/

    Get Hindi Medium and English Medium NCERT Solution for Class 10 Science to download.
    Please follow the link to visit website for first and second term exams solutions.
    https://www.tiwariacademy.com/ncert-solutions/class-10/Science/chapter-3/

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    • 1