Is Matter Around Us Pure — Science STD 9 — Question

When two molecules of hydrogen react with one molecule of oxygen, the mass of reactants is 36, what is the mass of products:

The atomic number of an element E is 16. The number of electrons in ion E^2- will be:

1. 16
2. 18
3. 15
4. 14

A form of matter has no fixed shape but it has a fixed volume. An example of this form of matter is:

1. krypton.
2. kerosene.
3. Carbon steel.
4. Carbon dioxide.

Smallest particle of an element or a compound which is capable of independent existence is called:

Which isotope is used in the nuclear power plants to generate electricity?

Molecular mass of nitric acid is:

A homogenous mixture of two gases is:

Which of the following are also considered to be the states of matter?

1. Plasma.
2. Platelets.
3. BFC.
4. BHC.

1. (i) and (ii)
2. (ii) and (iii)
3. (i) and (iii)
4. (ii) and (iv)

Maximum intermolecular force of attraction exists in:

The smell of hot sizzling food reaches you several meters away, but to get the smell of the cold food you have to go close.Which property of matter does this activity show: