Elements, Compounds and Mixtures Test - 8

Nuts are good sources of fat, fiber and protein. Most of the fat in nuts is monounsaturated fat, as well as omega-6 and omega-3 polyunsaturated fat. However, they do contain some saturated fat. Nuts also pack a number of vitamins and minerals, including magnesium and vitamin E.

Therefore, option (d) is correct.

Calcium hydroxide is used in the construction industry as part of mortar, since its reaction with carbon dioxide of the air binds the particles of sand and gravel by forming calcium carbonate.

Therefore, option (a) is correct.

Neon or argon are the most common gases used; krypton, xenon, and helium are used by artists for special purposes but are not used alone in normal signs.

Therefore, option (A) is correct.

Balancing of a Chemical equation is based on the Principle of Atom Conservation (POAC) which states that the total number of atoms of each element in reactants must equal the number of atoms of that element in products. It is a derivation of law of Mass Conservation.

Therefore, option (a) is correct.

The definition of endothermic is a chemical reaction that is accompanied by the absorption of heat, or an organism that generates heat to maintain its temperature. A chemical reaction that works only if heat is absorbed is an example of a reaction that would be described as endothermic. An example of an endothermic change is dissolving of ammonium chloride in water.

Therefore, option (d) is correct.

Hydrogen sulphide is highly toxic and highly flammable gas. The routes of exposure to it includes inhalation and skin or eye contact. Its inhalation causes burning sensation in the respiratory tract including the throat. Nausea, headache, delirium, skin and eye irritation (keratoconjunctivitis) occur when an individual is exposed to the acute concentration of the hydrogen sulphide. Hence, the correct answer is 'Hydrogen sulphide'.

The combustion of natural gas, on the other hand, releases very small amounts of sulfur dioxide and nitrogen oxides, virtually no ash or particulate matter, and lower levels of carbon dioxide, carbon monoxide, and other reactive hydrocarbons.

Therefore, option (A) is correct.

Fermentation is a metabolic process that produces chemical changes in organic substrates through the action of enzymes. The science of fermentation is known as zymology. In microorganisms, fermentation is the primary means of producing adenosine triphosphate (ATP) by the degradation of organic nutrients anaerobically.

Therefore, option (d) is correct.

Hydrogen is a colorless, odorless, nonmetallic, tasteless, highly flammable diatomic gas with the molecular formula H₂. With an atomic weight of 1.

Therefore, option (b) is correct.

Phosphorus is a non-metal which is stored in water. It is poisonous and can ignite instantly when it comes into contact with air. So it is stored in water. Phosphorus has 3 allotropes.

Therefore, option (d) is correct.

An exothermic reaction is a chemical reaction that evolution of energy by light or heat.Energy is absorbed to break bonds, and energy is evolved as bonds are made. ... Such a reaction is said to be endothermic if the energy is in the form of heat. The opposite of endothermic is exothermic; in an exothermic reaction, energy as heat is evolved.

Therefore, option (c) is correct.

Calcium sulfate (or calcium sulphide) is the inorganic compound with the formula CaSO4 and related hydrates. In the form of γ-anhydrite (the anhydrous form), it is used as a desiccant. One particular hydrate is better known as plaster of Paris, and another occurs naturally as the mineral gypsum.

Therefore, option (c) is correct.

The symbol Hg that mercury is known by comes from its Greek name, hydrargyrum, which means "liquid silver" — to reflect its shiny surface. The element is also known as quicksilver for its mobility.

Therefore, option (b) is correct.

In animals, cells produce chemical energy from degradation of the organic compound and in other plant decomposed food from photosynthesis process. Thus Respiration is an important biochemical reaction process of oxidation by which food materials are oxidized to produce carbon dioxide, water, and energy.

Therefore, option (b) is correct.

The process in which solids directly change to gases is known as sublimation. This occurs when solids absorb enough energy to completely overcome the forces of attraction between them. Dry ice is an example of solids that undergo sublimation.

Therefore, option (b) is correct.