Chemistry - Study Mode
[#756] The minimum energy required for an effective collision is
Correct Answer
(B) Activation energy
Explanation
Solution: The minimum amount of energy that molecules must have in order for a reaction to occur upon collision is called activation energy.
[#757] Which of the following produces highest amount of energy upon oxidation?
Correct Answer
(B) Fat
Explanation
Solution: Fats consist of a wide group of compounds that are generally soluble in organic solvents and generally insoluble in water. Chemically, fats are triglycerides, triesters of glycerol and any of several fatty acids. Fats may be either solid or liquid at room temperature, depending on their structure and composition. Although the words “oils”, “fats”, and “lipids” are all used to refer to fats, “oils” is usually used to refer to fats that are liquids at normal room temperature, while “fats” is usually used to refer to fats that are solids at normal room temperature. Fats also serve as energy stores for the body, containing about 37.8 kilojoules (9 calories) per gram of fat. They are broken down in the body to release glycerol and free fatty acids. The glycerol can be converted to glucose by the liver and thus used as a source of energy.
[#758] Which of the following has least negative electron gain enthalpy?
Correct Answer
(A) P
Explanation
Solution: The element with the most negative electron gain enthalpy is chlorine, and the one with the least negative electron gain enthalpy is phosphorus.
[#759] Which of the following appeared to be with a significant potential for accumulation through food chains ?
Correct Answer
(A) DDT
Explanation
Solution: DDT appeared to be with a significant potential for accumulation through food chains.
[#760] Higher concentration of nitrogen dioxide in atmosphere air causes
Correct Answer
(B) Bronchitis
Explanation
Solution: Higher concentration of nitrogen dioxide in atmosphere air causes bronchitis.