(true/false) J.J. Thomson proposed that the nucleus of an atom contains only nucleons.

True/false Tamarind contains oxalic acid.

Explain,why the spectrum of hydrogen atom has many lines.although a hydrogen atom contains only one electron.

What are the limitations of J.J. Thomson model of atom ?

Fill ups: J.J.Thomson suggested…………….model of atom.

The question given below consist of an assertion (A) and a reason ( R). Use the following key to choose the appropriate answer to these questions from the codes (a), (b), ( c) and (d) given below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is NOT the correct explanation of A. (c) A is true but R is false. (d) A is false and R is also false. Assertion: The whole mass of the atom is concentrated in the nucleus. Reason: The mass of the nucleus can be either less or more than the sum of the masses of nucleus.

True of False : The minerals siderite, magnetite and haematite contain iron.

True or False R.H. Whittaker proposed five kingdom classification.