Select the option that is related to the third number in

In the periodic table of elements, what happens to the atomic radius as you move from left to right across a period?

Haematite ores is the ore of which metal?

_____ is used for making chemical apparatus like beakers, flasks, etc.

Which of the following statement is/are true?

I. Metal oxides are acidic in nature

II. Non-metallic oxides are basic in nature

Which of the following vitamins is called a water-soluble vitamin?

Air coolers are more suitable for –

A radioactive substance emits?

Match the following columns and choose the correct option:

_____ are a group of chemicals that influence cell division and shoot formation.

Which among the following form of coal contains the highest percentage of carbon content?