Bakelite, the first fully synthetic plastic, is a thermosetting phenol formaldehyde resin. It is formed by a condensation reaction between phenol and formaldehyde. Once molded and heated, it sets permanently and cannot be remelted. It is used for electrical switches, utensil handles, and jewelry.
Explanation:
Elements in the same vertical column (group) have the same number of electrons in their outermost shell (valence electrons). This gives them similar chemical properties. The number of shells increases as we go down a group, leading to trends in atomic radius and ionization energy.
Explanation:
Cathode rays consist of electrons, which are fundamental particles. Therefore, their nature (charge to mass ratio) is independent of the gas used in the cathode ray tube or the material of the cathode. All other statements are correct properties of cathode rays, demonstrating their fundamental particle nature.
Explanation:
Bleaching powder is chemically calcium oxychloride, with the formula CaOCl₂. It is produced by the action of chlorine gas on dry slaked lime (Ca(OH)₂). Option A is slaked lime, C is plaster of Paris, and D is washing soda. It is used for disinfecting water and bleaching textiles.
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