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7th Class Science Acids, Bases and Salts / अम्ल, क्षार एवं लवण Question Bank Acids, Bases and Salts

  • question_answer
    DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 1 The rain which contains a higher level of acid than normal is called acid rain. Acidic gases like sulphur dioxide, nitrogen dioxide and carbon dioxide which are released as pollutants during the burning of various types of faels dissolve in rain drops and when these rain drops fall as rain on earth, we call it acid rain. What is the main cause of acid rain?

    A) Pollution

    B) Deforestation

    C) Excessive rains

    D) All factors are equally effective

    Correct Answer: A

    Solution :

    Presence of polluting gases like \[\text{S}{{\text{O}}_{\text{3}}}\text{,N}{{\text{O}}_{\text{2}}}\] etc. These gases dissolve in rain water and forms corresponding acid.


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