Which of the following is the poorest conductor of heat in comparison to other options?

Which among the following is Fool’s Gold?

Which of the following substances is not considered as toxic pollutant of water?

Which of the following chemicals is also known as "sweet oil of vitriol"?

Upto which element the Law of Octaves was found to be applicable?

What is the main constituent of Bio gas?

Which base is present in soap?

What is the another name of Vitamin C?

Which one of the following is a non-metallic mineral?

Which chemical present in the car tires is responsible for killing fishes?