John Dalton put forward the atomic theory in 1808, proposing that matter is made of indivisible atoms, atoms of same element are identical, and compounds are combinations of atoms. Electron was discovered by J.J. Thomson, periodic table by Mendeleev, neutron by Chadwick.
Explanation:
A gel is a type of colloid where the dispersed phase is a liquid and the dispersed medium is a solid. Cheese, butter, and jellies are classic examples of gels. Milk is an emulsion (liquid in liquid), while fog and smoke are aerosols.
Explanation:
Reduction can be defined as loss of oxygen, gain of hydrogen, gain of electrons, or decrease in oxidation number. All are correct definitions.
Explanation:
Chlorofluorocarbons (CFCs), once widely used as refrigerants and propellants, are the primary culprits behind ozone depletion. When CFCs reach the stratosphere, UV radiation breaks them down, releasing chlorine atoms. A single chlorine atom can catalytically destroy thousands of ozone (O3) molecules.
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