Chemistry Questions

Atomic number of which of the following elements is greater than that of Copper?

Which of the following is essential for the synthesis of thyroxin?

Atomic number of an atom gives the number of which of the following ?

When iron is exposed to moist air, a reddish brown coating of hydrated Iron (III) Oxide (Fe2O3) is deposited on its surface. This reddish brown coating is called

The modern periodic table consists of 18 groups and 7 periods. What is the atomic number of the element placed in the 3rd group and the 4th period?

Iron and manganese present as pollutants in water cannot be removed by_____

A change in which no new substances are formed is called _____________.

The series of processes by which nitrogen and its compounds are inter-converted in the environment and in living organisms is called _____ .