Elements, Compounds and Mixtures Test - 9

Sulfur dioxide is fairly soluble in water, and by both IR and Raman spectroscopy; the hypothetical sulfurous acid, H₂SO₃, is not present to any extent.

Therefore, the option (b) is correct.

Probably the easiest, most readily available reaction is the one between laundry detergent and water. ... Another simple example of an exothermic reaction is combustion, such as lighting a candle. An initial input of energy causes oxygen and wax react to produce carbon dioxide, water, and heat.

Therefore, option b is correct.

Water and kerosene oil are two immiscible liquids.ao, a mixture of kerosene oil and water can be separated by using a separating funnel. when the mixture of water and kerosene oil is put in a separating funnel, it forms two layers.

Therefore, option (a) is correct.

The three most common acids in soft drinks are citric, carbonic and phosphoric acids. Citric acid comes from citrus products and any soft drink with citrus flavoring will contain it. The chemical formula is H(3)C(6)H(5)O(7). Carbonic acid forms from dissolved carbon dioxide, which is present in almost all soft drinks.

Therefore, option (b) is correct.

Bleaching powder is used as disinfectant and germicide especially in the sterilization of drinking water. It is used for manufacturing of chloroform. It is used for bleaching silk and wool.

Therefore, option c is correct.

Fractional distillation is useful for separating a mixture of substances with narrow differences in boiling points, and is the most important step in the refining process. This content is not compatible on this device. The oil refining process starts with a fractional distillation column.

Therefore, option (c) is correct.

First proposed by J. J. Thomson in 1904 soon after the discovery of the electron, but before the discovery of the atomic nucleus, the model tried to explain two properties of atoms then known: that electrons are negatively-charged particles and that atoms have no net electric charge.

Therefore, option (b) is correct.

A solution is two components: a solvent and a solute. The solvent is the mixture that makes up the majority of the solution and is the component that dissolves the other substance(s). In this question, the sugar is introduced to the iced tea, making sugar the solute and the iced tea the solvent.

Therefore, option (b) is correct.

Water chlorination is the process of adding chlorine or chlorine compounds such as sodium hypochlorite to water. This method is used to kill certain bacteria and other microbes in tap water as chlorine is highly toxic.

Therefore, option (a) is correct.

Helium is a chemical element with symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table.

Therefore, option b is correct.

Nicotine is the chemical in tobacco that keeps you smoking. Nicotine that gets into your body through cigarettes activates structures normally present in your brain called receptors.

Therefore, option a is correct.

Gunpowder is a mixture of potassium nitrate, carbon, and sulfur. Since it is a mixture, it does not, strictly speak, have a formula. The standard composition for black powder (i.e., Proportions by weight) are 75% potassium nitrate, 15% Carbon, and 10% sulfur.

Therefore, option (a) is correct.

Precipitation refers to a chemical reaction that occurs in aqueous solution when two ions bond together to form an insoluble salt, which is known as the precipitate.

Therefore, option (c) is correct.

Copper carbonate being heated. Upon heating, copper carbonate (CuCO₃, green) forms copper oxide (CuO, black) and carbon dioxide gas (CO₂). Breaking one substance down into two or more substances using heat is called thermal decomposition. The formula for this reaction is CuCO₃ → CuO + CO₂.

Therefore, option (b) is correct.

Molecules containing more than 3 atoms are called as a poly-nuclear molecule.

Example: P₄is a polyatomic molecule.

Therefore, option (d) is correct.