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Class 12 Chemistry: most repeated questions

Written by Dr. Ayesha Nadeem (Chemistry)

These short questions came back in more than one exam. The count is based on 11 past papers from 11 exams (BISE Gujranwala, BISE Multan, 2020 to 2026).

Asked in three or more exams

  1. What is the Chemistry of Borax Bead Test?

    Appeared in 4 of 11 exams: 2020, 2021, 2025.

    See the papers

  2. Write down names of components of environment.

    Appeared in 3 of 11 exams: 2022, 2025, 2026.

    See the papers

  3. Write down the important raw materials used for the manufacture of cement.

    Appeared in 3 of 11 exams: 2020, 2021, 2025.

    See the papers

  4. Why does damaged tin plated iron get rusted quickly?

    Appeared in 3 of 11 exams: 2021, 2024, 2025.

    See the papers

  5. Why aqueous solution of borax is alkaline in nature?

    Appeared in 3 of 11 exams: 2020, 2021, 2022.

    See the papers

Asked in two exams

  1. How does Nitrogen differ from other elements of its own group?

    Appeared in 2 of 11 exams: 2021, 2022.

    See the papers

How these were counted is explained on the repeated questions page. A question that appeared before may not appear again, so revise the whole syllabus. You can also browse the papers and practise chapter questions in the practice section.