Chemistry Questions

Plaster of Paris ______.

I. changes into gypsum on mixing with water

II. is CaSO4.2H2O

III. is used for decoration

What is formed when helium atom loses one electron?

The movement of water molecules through the plasma membrane is called ______.

Find the similarity in the following :

Carbon, Silicon, Boron, Arsenic

Which of the following statements are CORRECT?

I. Oxides of metals are generally basic.

II. Oxides of non-metals are generally acidic.

III. Non-metals are generally electro positive.

Which of the following is a non metal that remains liquid at room temperature  ?

In a combination reaction there can be ______.

I. two or more than two reactants

II. two or more than two products

III. only one product

Generally covalently bonded molecules ______.

I. have high boiling and melting point as compare to ionically bonded molecules

II. poor conductors of electricity

III. have weak intermolecular force