Atoms and Molecules — Science STD 9 — Question

For the following statements, write T for True and F for False.
J.J. Thomson proposed that the nucleus of an atom contains only nucleons.

State whether the following statement is true or false:

Milk is a pure substance.

State whether the following statement is true or false:
Radioactive isotope of iodine is used for making the medicine called tincture iodine.

State whether the following statements are true or false:

1. Bread is an example of solid foam.

2. Sponge is an example of solid sol.

What type of colloids are bread and sponge?

State whether the following statements are true or false:
The cathode rays obtained from all the gases consist of negatively charged particles called electrons.

Sea water boils below 100°C. [True/ False]

State whether the following statement is true or false:
Red brown bromine vapour diffuse into air in a gas jar but the colourless air molecules do not diffuse into bromine vapour.

State whether the following statements are true or false:
Thomson proposed that the nucleus of an atom contains protons and neutrons.

State whether the following statement is true or false:
Solid carbon dioxide is stored under low pressure.