Chemistry - Study Mode
[#326] Seaweeds are important source of
Correct Answer
(D) Iodine
Explanation
Solution: Seaweeds are among the most potent accumulators of iodine. Kelps of the Laminaria genus were identified as a major iodine source. Iodine is found at low concentrations throughout the ocean waters, many types of seaweed accumulate the element in very high levels.
[#327] Sea weeds are important source of
Correct Answer
(D) Iodine
[#328] The strongest oxidizing agent among the following is:
Correct Answer
(C) Fluorine
Explanation
Solution: Fluorine is the most electronegative element because electronegativity decreases on moving down the group. Hence, it gets reduced readily into F+ ion and is the strongest oxidising agent.
[#329] Helium is added to the oxygen supply of deep sea divers because it is
Correct Answer
(D) Less soluble in blood than nitrogen at high pressure
Explanation
Solution: Deep-sea divers have their oxygen supply mixed with helium in order to avoid the toxic nature of oxygen under extreme pressures. The Helium atom is much smaller than the Nitrogen molecule, has a smaller electron cloud and is less polarizable. It, therefore, is less soluble in blood than nitrogen and prevents the formation of nitrogen bubbles in blood which blocks blood flow as the diver comes to the surface of the sea from underwater.
[#330] Vulcanization of rubber is carried out by adding
Correct Answer
(A) Sulphur
Explanation
Solution: Vulcanization is a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent “curatives” or “accelerators”. These additives modify the polymer by forming crosslinks (bridges) between individual polymer chains. Vulcanized materials are less sticky and have superior mechanical properties. A vast array of products are made with vulcanized rubber including tires, shoe soles, hoses, and hockey pucks. The process is named after Vulcan, Roman god of fire. Hard vulcanized rubber is sometimes sold under the brand names ebonite or vulcanite, and is used to make hard articles such as bowling balls and saxophone mouth pieces.