The correct option is (b).
Explanation
Electrical conductivity in liquids depends on the presence of free-moving ions which act as charge carriers. Pure water molecules do not dissociate significantly into ions, making pure water a poor conductor (insulator), whereas water containing dissolved impurities possesses ions that facilitate current flow.
Statement 1 is Incorrect:
Rainwater is not chemically pure. As rain falls through the atmosphere, it dissolves atmospheric gases such as carbon dioxide ($CO_2$), sulphur dioxide ($SO_2$), and nitrogen oxides. These gases react with water to form weak acids (e.g., carbonic acid), which dissociate into ions. Due to the presence of these ions, rainwater conducts electricity.
Statement 2 is Correct:
Tap water is obtained from natural sources and contains dissolved mineral salts (such as calcium, magnesium, and sodium salts). These salts dissociate into positive and negative ions in the solution. The presence of these free ions allows tap water to conduct electricity effectively.
Key Takeaway:
Distilled water is a poor conductor of electricity due to the absence of free ions. In contrast, tap water and rainwater are conductors because they contain dissolved mineral salts and atmospheric impurities, respectively, which provide the necessary charge carriers.