Miscellaneous And Useful Chemical Compounds (Part-III)

1. Diamond is an allotrope of: [S.S.C. JE Mechanical Exam 27.10.2020 (Shift-I)]

(a) Boron
(b) Silicon
(c) Arsenic
(d) Carbon

Correct Answer: (d) Carbon

Solution:Diamond is an allotrope of carbon. When an element is found in many forms, this property of the element is called allotropy. Other allotropes of carbon are graphite, coal, coke, charcoal, fullerene, etc. Diamond and graphite are the two major crystalline forms of carbon.

2. Sour taste of lemon is due to the presence of which of the following? [S.S.C. Online Graduate Level (T-I) 8.09.2016 (Shift-II)]

(a) Citric acid
(b) Acetic acid
(c) Oxalic acid
(d) Formic acid

Correct Answer: (a) Citric acid

Solution:The sour taste of lemon is due to the presence of citric acid in its juice. Citric acid is also found in fruits such as oranges and grapefruits, but lemons contain higher amounts.

3. In which of the following options is the substance INCORRECTLY paired with the acid present in that substance? [S.S.C. Online C.H.S.L. (T-I) 09.08.2021 (Shift-II)]

(a) Lemon - Lactic Acid
(b) Orange - Citric Acid
(c) Vinegar - Acetic Acid
(d) Tomato - Oxalic Acid

Correct Answer: (a) Lemon - Lactic Acid

Solution:The sourness found in lemon is due to the citric acid present in it. Lactic acid is responsible for the conversion of milk into curd. Other options are correctly matched.

4. In which of the following is citric acid present? [S.S.C. Online Graduate Level (T-I) 9.03.2020 (Shift-I)]

(a) Curd
(b) Lemon
(c) Tamarind
(d) Black Gram

Correct Answer: (b) Lemon

Solution:The sourness found in lemon is due to the citric acid present in it. Lactic acid is responsible for the conversion of milk into curd. Other options are correctly matched.

5. Which of the following acid is present in sour milk? [S.S.C. Online MTS (T-I) 21.09.2017 (Shift-II)]

(a) Formic acid
(b) Lactic acid
(c) Citric Acid
(d) Tartaric Acid

Correct Answer: (b) Lactic acid

Solution:Sourness is found due to the presence of lactic acid in sour milk and whey or curd etc.

6. Which of the following acids is NOT present in grapes? [S.S.C. Online Graduate Level (T-I) 5.03.2020 (Shift-III)]

(a) Tartaric acid
(b) Acetic acid
(c) Citric acid
(d) Malic acid

Correct Answer: (b) Acetic acid

Solution:Different types of organic acids are found in grapes such as malic acid, tartaric acid, and citric acid, etc. But acetic acid is not found in grapes. Acetic acid is found in vinegar.

7. Which of the following acids found in Apple? [S.S.C. Graduate Level (T-I) 6.06.2019 (Shift-III)]

(a) Malic Acid
(b) Sulphuric Acid
(c) Formic Acid
(d) Nitric Acid

Correct Answer: (a) Malic Acid

Solution:Different types of organic acids are found in grapes such as malic acid, tartaric acid, and citric acid, etc. But acetic acid is not found in grapes. Acetic acid is found in vinegar.

8. Which of the following acid-source pairs is correctly matched? [S.S.C. Online MTS (T-I) 14.08.2019 (Shift-III)]

(a) Citric Acid - Lemon
(b) Lactic Acid - Vinegar
(c) Formic Acid - Tamarind
(d) Acetic Acid - Ant’s sting

Correct Answer: (a) Citric Acid - Lemon

Solution:The correct matching is:

Citric acid - Lemon
Lactic acid - Milk
Formic acid - Ant sting
Acetic acid - Vinegar

Tartaric acid is found in tamarind.

9. Which acid is present in tomatoes? [S.S.C. Online Constable GD 22.02.2019 (Shift-I)]

(a) Tartaric acid
(b) Sulfenic acid
(c) Malic Acid
(d) Oxalic acid

Correct Answer: (d) Oxalic acid

Solution:Citric acid is mainly found in tomatoes and oxalic acid is found in moderate amounts in tomatoes. In fact, as tomatoes ripen, the amount of vitamin C (ascorbic acid) decreases, while the amount of oxalic acid increases.

10. Name the acid present in tamarind. [S.S.C. Online Constable GD 18.02.2019 (Shift-III)]

(a) Lactic acid
(b) Tartaric acid
(c) Citric acid
(d) Amino acids

Correct Answer: (b) Tartaric acid

Solution:Tartaric acid is prominent among the acids found in tamarind, due to which excessive sourness is found in tamarind.