पुदीने की पत्तियों में ठंडक के अहसास के लिए जिम्मेदार रासायनिक यौगिक कौन सा है?

Patients are instructed to swallow a suspension of which compound as a radiopaque contrast agent before undergoing X-ray examination of the gastrointestinal tract?

To combat anemia and iodine deficiency disorders, the Government of India promotes 'double fortified salt'. Which two essential minerals are added to this salt?