Chemistry GK Quiz Questions

The outermost orbital shell of an atom is called its valence shell, and the electrons present in the valence shell are called valence electrons. The valence electrons of an atom are electrons with higher energy and hence they are more reactive.

Ethylene (IUPAC name: ethene) is a hydrocarbon whose molecular formula is C2H4 or H2C=CH2. It is a colorless, flammable gas with a mild sweet musky odor. Ethylene is used extensively in chemical industries.

Nuclei are classified based on the number of protons (atomic number) or the total number of nucleons (mass number):

Isotopes: Atoms of an element which have the same atomic number but different mass numbers are called isotopes. All isotopes have similar chemical properties.

Isobar: Nuclei which have the same mass number (A) but a different atomic number (Z) are called isobar.

Even-neutronic: Nuclei having equal number of neutrons are called even-neutronic. For them both atomic number (Z) and mass number (A) are different, but the value of (A – Z) is the same.

The spin of two electrons located in the same orbital is found to be opposite, hence the spin between them is known by the quantum number.

An atom has three parts: protons, electrons, and neutrons. The nucleus contains protons and neutrons and electrons revolve around the nucleus. The proton has a positive charge, the electron has a negative charge and the neutron has no charge.

The pH scale ranges from 0 to 14.

If pH < 7 then the solution is acidic. If pH > 7 then the solution is alkaline. If pH = 7 then the solution is neutral.

Isobar: Nuclei which have the same mass number (A) but a different atomic number (Z) are called isobar. Even-neutronic: Nuclei having equal number of neutrons are called even-neutronic. For them both atomic number (Z) and mass number (A) are different, but the value of (A – Z) is the same.

J.J. Thomson:

Discovery of electron J. J. Thomson did it in 1897. Hence, option 4 is correct.

An electron is a low-mass and negatively charged particle.

He won the Nobel Prize in 1906 "for his theoretical and experimental investigations on the conduction of electricity by gases."

Reduction is a chemical process that involves the gaining of electrons by an atom.

An atom is made up of three particles, namely neutron, proton and electron. Hydrogen has no neutrons. Every atom has a nucleus that binds one or more electrons around itself.