Option “C” is correct A type of colloid, of the form of one solid dispersed in another continuous solid is called Solid sol. Coloured Gems is an example of solid sol.
152. Process of loosing electrons is known as _____.
1. oxidation
2. reduction
3. radiation
4. both oxidation and reduction
Option “A” is correct The process of loosing electrons is known as Oxidation.
153. Anions are formed by _____.
1. losing of electrons
2. gaining of electrons
3. gaining of neutrons
4. losing of neutrons
Option “B” is correct Anions are atoms or radicals (groups of atoms), that have gained electrons. Since they now have more electrons than protons, anions have a negative charge. For example,Chloride ions Cl- , Bromide Br- , Iodide I-.
154. What is the common characteristic of the elements of the same group in the periodic table?
1. Electrons in outer most shell
2. Total number of electrons
3. Total number of protons
4. Atomic weight
Option “A” is correct The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements.
Option “B” is correct Nickel allergy is a common cause of allergic contact dermatitis — an itchy rash that appears where your skin touches a usually harmless substance.
156. Most liquids that conduct electricity are solutions of acids, bases and ______.
1. Copper
2. Aluminium
3. Salts
4. Iron
Option “C” is correct Most liquids that conduct electricity are solutions of acids, bases and salts.
157. Which among the following elements has highest Electronegativity?
1. Gallium
2. Sodium
3. Arsenic
4. Caesium
Option “C” is correct Arsenic has highest electronegativity in the given elements.
Option “B” is correct Tramadol is used to treat moderate to moderately severe pain.
159. Which of the following is a Synthetic rubber?
1. Leoprene
2. Monoprene
3. Neoprene
4. Isoprene
Option “C” is correct Neoprene is a family of synthetic rubbers that are produced by polymerization of chloroprene. Neoprene exhibits good chemical stability and maintains flexibility over a wide temperature range.
160. Which of the following elements has the lowest melting point?
1. Platinum
2. Carbon
3. Cobalt
4. Krypton
Option “D” is correct Among the following elements Krypton has the lowest melting point.
