1.
Carbon Monoxide is a colorless, odorless, and tasteless gas which is slightly lighter than air. It is highly toxic to humans and animals in higher quantities.
Correct Answer
B. CO
Explanation
Carbon Monoxide (CO) is the correct answer. It is a colorless, odorless, and tasteless gas that is slightly lighter than air. It is highly toxic to humans and animals in higher quantities.
2.
Carbon dioxide is one of the gases in our atmosphere, which is uniformly distributed over the Earth's surface.
Correct Answer
B. CO2
Explanation
Carbon dioxide (CO2) is one of the gases present in the Earth's atmosphere. It is uniformly distributed over the Earth's surface, meaning it is spread out evenly in the air. The other options mentioned (CO, C2O2, COS) are not correct because they do not represent carbon dioxide.
3.
Hydrogen peroxide is an oxidizer commonly used as a bleach. It is the simplest peroxide (a compound with an oxygen-oxygen single bond). Hydrogen peroxide is a clear liquid, slightly more viscous than water, that appears colorless in dilute solution. It is used as a disinfectant, antiseptic, oxidizer, and in rocketry as a propellant.
Correct Answer
D. H2O2
Explanation
Hydrogen peroxide is a compound with the chemical formula H2O2. It is the correct answer because it matches the description given in the question. Hydrogen peroxide is commonly used as a bleach and is a clear liquid that appears colorless in dilute solution. It is also used as a disinfectant, antiseptic, oxidizer, and in rocketry as a propellant. The other options listed (HPO, HPOX, H2O) do not match the description of hydrogen peroxide.
4.
Methane is the simplest alkane, and the principal component of natural gas. Burning methane in the presence of oxygen produces carbon dioxide and water. The relative abundance of methane makes it an attractive fuel. However, because it is a gas at normal temperature and pressure, methane is difficult to transport from its source. It is generally transported in bulk by pipeline in its natural gas form.
Correct Answer
C. CH4
Explanation
Methane, represented by the chemical formula CH4, is the correct answer. It is the simplest alkane and the main component of natural gas. When methane is burned in the presence of oxygen, it produces carbon dioxide and water. Methane is abundant and is considered an attractive fuel. However, due to its gaseous state at normal temperature and pressure, it is challenging to transport. It is typically transported in bulk through pipelines in its natural gas form.
5.
Propane is a three-carbon alkane, typically a gas, but compressible to a transportable liquid. A by-product of natural gas processing and petroleum refining, it is commonly used as a fuel for engines, oxy-gas torches, barbecues, portable stoves, and residential central heating.
Correct Answer
C. C3H8
Explanation
Propane (C3H8) is a correct answer because it is a three-carbon alkane, as mentioned in the provided information. It is typically a gas but can be compressed into a liquid form for transportation. Propane is a by-product of natural gas processing and petroleum refining and is commonly used as a fuel for engines, torches, barbecues, portable stoves, and residential central heating.
6.
Butane is a gas that is an alkane. Butanes are highly flammable, colorless, easily liquefied gases.
Correct Answer
D. C4H10
Explanation
Butane is a gas that is an alkane, specifically a hydrocarbon with four carbon atoms. It is highly flammable and easily liquefied. The chemical formula C4H10 represents butane, with the "C" representing carbon and the "H" representing hydrogen.
7.
Methanol, also known as methyl alcohol, wood alcohol, wood naphtha, or wood spirits. It is the simplest alcohol and is a light, volatile, colorless, flammable liquid with a distinctive odor that is very similar to but slightly sweeter than ethanol (drinking alcohol). At room temperature, it is a polar liquid and is used as an antifreeze, solvent, fuel, and as a denaturant for ethanol.
Correct Answer
A. CH3OH
Explanation
MeOH is sometimes used as an abbreviation.
8.
Ethanol, also called ethyl alcohol, pure alcohol, grain alcohol, or drinking alcohol, is a volatile, flammable, colorless liquid. It is a powerful psychoactive drug and one of the oldest recreational drugs. Best known as the type of alcohol found in alcoholic beverages, it is also used in thermometers, as a solvent, and as an alcohol fuel.
Correct Answer
C. C2H5OH
Explanation
C2H6O is the empirical formula.
9.
Fructose, or fruit sugar, is a simple monosaccharide found in many foods. It is one of the three essential dietary monosaccharides, along with glucose and galactose. Honey, tree fruits, berries, melons, and some root vegetables contain significant amounts of molecular fructose, usually combined with glucose, stored in the form of sucrose. About 240,000 tonnes of crystalline fructose are produced annually.
Correct Answer
A. C6H12O6
Explanation
Fructose is a simple monosaccharide and its chemical formula is C6H12O6. This means that it consists of 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms. The other options, C2H12O5, CO6H12, and CO12H6, do not match the correct chemical formula for fructose.
10.
Glucose is a simple sugar and an important carbohydrate in biology. Cells use it as a source of energy and a metabolic intermediate. Glucose is one of the main products of photosynthesis and starts cellular respiration.
Correct Answer
B. C6H12O6
Explanation
Glucose is a simple sugar with the chemical formula C6H12O6. It is an important carbohydrate in biology as it is used by cells as a source of energy and a metabolic intermediate. Glucose is also one of the main products of photosynthesis and is involved in starting cellular respiration.
11.
Ascorbic acid is a sugar acid with antioxidant properties. Its appearance is white to light-yellow crystals or powder, and it is water-soluble. Ascorbic acid is one form of vitamin C. The name is derived from a- (meaning "no") and scorbutus (scurvy), the disease caused by a deficiency of vitamin C.
Correct Answer
C. C6H8O6
Explanation
The correct answer is C6H8O6 because it matches the molecular formula of ascorbic acid. The molecular formula of ascorbic acid is C6H8O6, which indicates that it contains 6 carbon atoms, 8 hydrogen atoms, and 6 oxygen atoms. The other options do not match this formula.
12.
Vitamin A helps form and maintain healthy teeth, skeletal and soft tissue, mucous membranes, and skin. It is also known as retinol because it produces the pigments in the retina of the eye.
Correct Answer
C. C20H300
13.
Sucrose:
Correct Answer
B. C12H22O11
Explanation
Sucrose is a disaccharide composed of glucose and fructose. Its chemical formula is C12H22O11. The given answer, C12H22O11, matches the correct chemical formula for sucrose.