Which indicator is red in acidic medium and yellow in basic medium? MCQ with Answer and Explanation

Explanation:
Methane (CH4) is commonly known as marsh gas because it is produced by the anaerobic decomposition of organic matter in swamps and marshes by methanogenic bacteria. It is also the primary component of biogas and natural gas.

Explanation:
Cobalt-60 is a radioactive isotope that emits strong gamma radiation. It is widely used in radiotherapy to treat various types of cancers, including blood cancers like leukemia. Iodine-131 is used for thyroid disorders, Carbon-14 for radiocarbon dating, and Sodium-24 for detecting blood clots.

Explanation:
Ernest Rutherford, along with his students Geiger and Marsden, conducted the famous gold foil experiment in 1911. By observing that a few alpha particles bounced back, he concluded that the atom has a small, dense, positively charged center called the nucleus.