Which of the following option is true regarding the boiling point of hydrogen isotopes?

Hydrogen is used in the manufacture of _____

What is heavy water?

Deuterium is also known as _____

What is the temperature required in presence of molybdenum and iron for nitrogen to combine with hydrogen?

Hydrogen is a _______________

Which of the following element is an alkali as well as halogen?

Which of the following is a method of removing temporary hardness?