Practice MCQ Questions and answers on Chemistry-GK

The structure of (HPO₃)₃ is cyclic.

Entropy and enthalpy together make a new quantity, the Free Energy which, under conditions of constant temperature and pressure, determines the direction of spontaneous change. All spontaneous processes have a negative change in free energy.

UV photoelectron spectroscopy can provide information on the energy difference between the initial and final states rather the energy levels involved in the transition.

During formation of ice cubes orderedness increases, i.e., disorderness decreases, hence entropy decreases.

Warming Ammonium Chloride with Sodium Hydroxide in a test tube is an example of an Open System.

For a spontaneous chemical process, the free energy change is negative.

When a bond is formed between two atoms the energy of the system will decrease.

The minimum amount of energy that molecules must have in order for a reaction to occur upon collision is called activation energy.

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.

The element with the most negative electron gain enthalpy is chlorine, and the one with the least negative electron gain enthalpy is phosphorus.