Equilibrium MCQ

Ans. (1) Methanoic acid

Explanation: This is because Herbaceous plants such as nettles grow in the wild. A small number of stinging hairs grows on the leaves, causing them to sting when accidentally touched. They produce methanoic acid, which is responsible for this. Dock plants, which commonly grow alongside nettles, are used as a traditional remedy for nettle bites.

Ans. (2) Orange

Explanation: A citrus fruit is a fruit that contains citric acid. Examples include lemons, oranges, and grapefruits. Scurvy is caused by an insufficient amount of Vitamin C, which is why these fruits are sour in taste and a good source of Vitamin C. Citric acid is less abundant in grapes than in limes.

Ans. (4) all of these

Explanation: As a result of its reaction with active metals, hydrogen gas is produced. Salt compounds are formed by reacting with bases. Acid makes blue litmus red and phenolphthalein colorless and tastes sour. An electron pair can be accepted and a proton can be donated to it. Protons (H*) are released into water when it reacts with it. Hydrochloric acid, nitric acid, and sulphuric acid are the strong acids.

Ans. (2) Citric acid

Explanation: Organic acids are weak in comparison to citric acid. Tricarboxylic acid has six carbon atoms. Manufacturers commonly use manufactured citric acid as a food additive, cleaning agent, and nutritional supplement. Fungal fermentation is the main method of producing citric acid. Citric acid can be chemically synthesized, but this is more expensive than fungal fermentation.

Ans. (1) Methanoic acid

Explanation: An ant's sting contains formic acid, which is present in ant stings. Formic acid(methanoic acid) is the most basic carboxylic acid. HCOOH is its molecular formula. These ants are rather deadly after stinging as they lose their stingers and their poison glands produce formic acid in response.

Ans. (2) KNO₃

Explanation: Nitric acid is a strong acid, which is formed by ionizing KNO₃ in water. As a result, KNO₃ is useful in identifying acid solutions. The second option is correct. Because it is produced when the strong base (KOH) is dissolved, K* is an unreactive ion. The acidic solution cannot be identified with K₂SO₄.

Ans. (3) Ammonium chloride

Explanation: A salt example is ammonium chloride, which has an aqueous solution of pH less than 7. It is known that Ammonium Chloride (NH₄Cl) NH*CI H₂O -NH₂OH + HCI react together. All other salts when mixed with water give a basic solution.

Ans. (1) Less than 5.6

Explanation: As sulfur dioxide and nitrogen oxides are discharged into the air, they cause a chemical reaction that results in acid rain. Acid rain occurs when chemicals in the air combine with water, oxygen, and other chemicals to form a more acidic pollutant. When fossil fuels, such as coal, are burned to generate electricity, they release a significant amount of sulfur dioxide and nitrogen oxides.

Ans. (3) Antacid

Explanation: The anti-acid properties of an antacid neutralize the stomach's acid to help relieve heartburn and indigestion. They are especially effective if you suffer from: Gastroesophageal reflux disease (GORD) is also known as heartburn and acid reflux, Indigestion, Stomach ulcer and Gastritis (inflammation of the stomach lining).

Ans. (4) Increases as it loses electrons

Explanation: Oxidation is the loss of electrons, and reduction is the gain of electrons, so we can remember this using the acronym OILRIG. The result of oxidation is that electrons are lost from the atom. In turn, this increases its oxidation state, because its net charge becomes more positive.

Ans. (2) 8

Explanation: ka kb = kw

kb = 10^-8

ka × 10^-8 = 10^-14

ka = 10^-6 = [H⁺]

pH = −log [H⁺]

pH = −log 10^-6

= 6pH + pOH

= 14 pOH

= 14^-6

= 8

Ans. (2) 0.01%

Explanation. This is because NaX: Salt of weak acid, strong base.

⇒ α = (√Kh/c)

= √ (Kw) / (KaC)

= (10^-14) / (10^-5 × 0.1)

= 10^-4

⇒ % hydrolysis = 0.01%