Acid_ Base And Salts — Part 1 MCQs with Explanations

Correct Answer: Option C — Acetic acid (CH₃COOH) The question asks us to identify an organic acid from the given options. What is an organic acid? Organic acids are generally carbon-containing acids . Many common organic acids contain the –COOH (carboxyl) group . Acetic acid (CH₃COOH) is an organic acid because it contains carbon and has the –COOH group . It is commonly found in vinegar and gives vinegar its characteristic sour taste. Now, let's check the other options: Option A: Hydrochloric acid (HCl) — It contains no carbon, so it is an inorganic acid . Option B: Nitric acid (HNO₃) — It contains no carbon, so it is an inorganic acid . Option C: Acetic acid (CH₃COOH) — It contains carbon and the –COOH group , making it an organic acid . It is found in vinegar . Option D: Sulphuric acid (H₂SO₄) — It contains no carbon, so it is an inorganic acid . Easy way to remember: Acetic acid → Vinegar → Organic acid. Therefore, the correct answer is Option C: Acetic acid (CH₃COOH).

Sulfuric acid (H 2 SO 4 ) is considered one of the most important and widely used acids in various industries. It is involved in the production of fertilizers, detergents, and chemicals, among many other applications. It is also a strong acid with a wide range of uses, making it a basic chemical in the industrial sector. Key Points: >> H 2 SO 4 is essential in the manufacturing of phosphoric acid, which is then used to produce fertilizers. >> It is used in petroleum refining, metal processing, and even in the production of dyes and pharmaceuticals. >> Other acids, like H 2 CO 3 (carbonic acid), HNO 3 (nitric acid), and HCl (hydrochloric acid), also have industrial applications, but sulfuric acid is considered the most fundamental in terms of volume and variety of industrial uses. Thus, H 2 SO 4 is the correct answer.

* Acidity often comes from a molecule's ability to donate a proton (H+) or accept electrons. * In the context of these chlorides, we need to consider how they react with water (hydrolyze). Some will form acidic solutions because of this reaction. Now let's look at the options: * PCl 4 : This compound is unstable and doesn't exist under normal conditions. But theoretically, if it reacted with water, it could potentially form phosphorus-containing acids. * SbCl 4 : Antimony tetrachloride can hydrolyze to form acidic solutions containing antimony oxychlorides and hydrochloric acid. * CCl 4 : Carbon tetrachloride (CCl 4 ) is not acidic. It doesn't react with water easily. The carbon-chlorine bond is relatively strong, and there isn't a good mechanism for it to hydrolyze and release H+ ions. * PCl 2 : This compound is unstable and doesn't exist under normal conditions. Similar to PCl4 it is capable of forming phosphorus-containing acids. Therefore: The answer is CCl 4 because it doesn't readily hydrolyze to produce acidic species in water.

Let's understand what basicity of an acid means first. The basicity of an acid is simply the number of ionizable hydrogen atoms (H⁺) that one molecule of the acid can donate when it dissolves in water. Think of it like this: how many "acidic" hydrogens can it give away? If an acid has basicity one , it means it can donate only one H⁺ ion . We call such an acid a monoprotic acid . Let's look at the options: Option A: Phosphoric acid (H₃PO₄) This acid has three (3) ionizable hydrogen atoms. So, it can donate 3 H⁺ ions. Its basicity is three . Therefore, this option is incorrect. Option B: Sodium dihydrogen phosphate (NaH₂PO₄) This is a salt. However, the H₂PO₄⁻ ion in this salt still has two (2) hydrogen atoms that can be donated as H⁺ ions. So, if it acts as an acid, its basicity would be two . Therefore, this option is incorrect. Option C: Disodium hydrogen phosphate (Na₂HPO₄) This is also a salt. The HPO₄²⁻ ion in this salt has one (1) hydrogen atom that can be donated as an H⁺ ion. So, if it acts as an acid, its basicity is one . This matches what the question is asking for! Therefore, this option is correct . Option D: Sodium phosphate (Na₃PO₄) This is a salt. The PO₄³⁻ ion in this salt has no (0) hydrogen atoms to donate as H⁺ ions. In fact, it's a basic salt. So, its basicity is zero . Therefore, this option is incorrect. So, the correct answer is Disodium hydrogen phosphate (Na₂HPO₄) because it can donate only one H⁺ ion .

Acetic acid is the correct answer to “Vinegar used in cooking contains which of the following compounds”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

None of these is the correct answer to “A solution turns red litmus blue. The pH of solution is”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

Hydrochloric Acid is the correct answer to “Muriatic acid is scientifically known as:”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

NH3 is the correct answer to “Which is not a Lewis acid”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

Three is the correct answer to “Aqua regia is an acidic, corrosive and oxidative mixture consisting of . . . . . . . . volume/volumes of concentrated hydrochloric acid and one volume of concentrated nitric acid, often used to dissolve gold and platinum.”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

Hydrogen is the correct answer to “The common element for all acids is:”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

acidic in nature is the correct answer to “Sodawater obtained by passing carbon dioxide in water is”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

Formic acid is the correct answer to “Primarily, an ant's sting has which of the following”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

Only statement 1 is correct is the correct answer to “Which of the following statements is true/false? Statement: 1. H 2 SO 4 is used to remove sulphur and other compounds in petroleum refining. 2. The basic nature of sodium hydroxide (NaOH) is due to the presence of hydrogen ions.”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

Gastric juice is the correct answer to “Which one of the following gives the highest amount of hydrogen ions (H + )”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

Olefactory indicator is the correct answer to “The substances whose odor changes into acidic or alkaline medium . . . . . . . . it is said.”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

hydrochloric acid is the correct answer to “Sodium hydroxide reacts with . . . . . . . . to form a simple salt solution”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

Na2O is the correct answer to “Which of the following is not a neutral oxide”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

Solution 'B' is the correct answer to “Suppose you have four test tubes labelled as 'A', 'B', 'C' and 'D'. 'A' contains plain water, 'B' contains solution of an alkali, 'C' contains solution of an acid, and 'D' contains solution of sodium chloride. Which one of these solution will turn phenophthalein solution pink”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

acetic acid is the correct answer to “Vinegar made by fermentation from cane sugar contains”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

Sodium thiosulphate is the correct answer to “Which one of the following substances is used in photography and also as an antichlor”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

Calcium Oxychloride is the correct answer to “Which chemical compound is present in Bleaching Power”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

Lemon juice is the correct answer to “Which of the following solutions will have the lowest pH value”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

magnesium hydroxide is the correct answer to “Milk of magnesia is a suspension of”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

Indicates neutralization is the correct answer to “Which is correct on acidic basis”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

Phenolphthalein is the correct answer to “Which one among the following stages are suitable indicator when solution of sodium carbonate is mixed with sulphuric acid”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

Only 1 is correct is the correct answer to “An acid is a substance which 1. is sour in taste. 2. turns red litmus paper into blue.”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

more than 7 is the correct answer to “What is the pH value of an alkaline solution”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

a base is the correct answer to “In the reaction between hydrogen sulphate ion and water $$HSO_4^ - + {H_2}O \to {H_3}O + SO_4^{2 - }$$ the water acts as”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

Clove is the correct answer to “Which of the following is a olefactory indicator”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

Acids react with alkali and increase salts which is called decomposition reaction is the correct answer to “Which of the following statements regarding acids is incorrect”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

X, Z, Y is the correct answer to “The pH values of the three solutions X, Y, and Z are 2, 11 and 7 respectively. Arrange them in descending order of hydrogen ion concentration.”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

carbon dioxide from air is dissolved in the water is the correct answer to “The pH of fresh ground water slightly decreases upon exposure to air because”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

salt, water is the correct answer to “When an acid reacts with a metal oxide, . . . . . . . . and . . . . . . . . as a product”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

concentrated acid in water is the correct answer to “To dilute a concentrated acid, what should we do”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

OH- is the correct answer to “If the pH of a solution increases from 7 to 14, it indicates an increase in . . . . . . . . Ion concentration in the solution”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

below 7 is the correct answer to “If the pH value of river water is . . . . . . . ., then its water is considered polluted with acidic waste.”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

Strong acid and strong base is the correct answer to “NaCl is a salt, which is formed by-”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

Weak acid and strong base is the correct answer to “If the pH value of a salt is 12, then it is a salt of . . . . . . . .”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

Sulphuric acid is the correct answer to “Which one of the following acids is used in battery”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.

1, 2 and 3 is the correct answer to “Consider the following statements. 1. Limestone, chalk and marble are different forms of calcium carbonate. 2. When pH of rain water is less than 5.6, it is called acid rain. 3. Human body works with in the pH range of 7.0 to 7.8. Which of the statements given above are correct”. This question is standard in competitive examination syllabi for Acid_ Base And Salts.