Chapter 3 -Atoms and Molecules

Which of the following correctly represents 360g of water?

Which of the following statements is not true about an atom?

1 u or 1 amu means

Which of the following contains maximum number of molecules?

A sample of NH3 molecule irrespective of source contains 82.35% Nitrogen and 17.65% of Hydrogen by mass. This data supports:

An element X is divalent and another element Y is tetravalent. The compound formed by these two elements will be:

The molecular formula of potassium nitrate is ________.

 3.42 g of sucrose are dissolved in 18 g of water in a beaker. The numbers of oxygen atoms in the solution are:

 Molecular mass is defined as the:

A change in the physical state can be brought about

The atomic mass of sodium is 23. The number of moles in 46g of sodium is ________.

Which of the following represents a correct chemical formula?

 What is the formula mass unit of ZnO?

How many atoms of oxygen are present in 300 grams of CaCO3?

Which of the following represents the correct relation between Avogadro’s number (No), number of particles (N) and moles (n)?

Who coined the term ‘Parmanu’ for the smallest indivisible particles?

The radius of a hydrogen atom is:

The most remarkable concept that Dalton’s atomic theory proposed was that of the:

The atomic mass of carbon is:

Compounds composed of metals and non-metals contain:

The formula of ammonium sulphate is:

The word “mole” was introduced around 1896 by:

The chemical symbol for sodium is:

Which of the following has a maximum number of atoms?

Which of the following contains a maximum number of molecules?

In a compound such as water, the ratio of the mass of hydrogen to the mass of oxygen is always ______

Atomic radius is measured in ________

The symbol of iron is Fe from its Latin name _________

One atomic mass unit is a mass unit equal to exactly ________ the mass of one atom of carbon-12.

The formula unit mass of a substance is a sum of the atomic ______ of all its constituent atoms.