Chemistry (Part-X)

Total Questions: 50

1. The common name of Hydrogen Peroxide is _______. [S.S.C. Online CHSL (T-I) 21.01.2017 (Shift-I) ]

(a) Borax
(b) Bleach (liquid)
(c) Baking soda
(d) Gypsum

Correct Answer: (b) Bleach (liquid)

Solution:Hydrogen peroxide (

H₂ O₂

) is a common household chemical known for its bleaching and antiseptic properties. It's often used as a liquid bleach, particularly for hair or gentle fabric bleaching, and as a disinfectant for wounds. While it's not the only type of bleach, it's widely recognized in this context.

(a) Borax is Sodium Tetraborate Decahydrate.
(c) Baking soda is Sodium Bicarbonate.
(d) Gypsum is Calcium Sulfate Dihydrate.

2. The common name of Sodium Tetraborate Decahydrate is _______. [S.S.C. Online CHSL (T-I) 22.01.2017 (Shift-III) ]

(a) Epsom salt
(b) Gypsum
(c) Borax
(d) Galena

Correct Answer: (c) Borax

Solution:Sodium tetraborate decahydrate, with the chemical formula (Na₂B₄O₇.10H₂O), is commonly known as Borax. It's a versatile mineral and salt of boric acid, widely used in cleaning products, as a laundry booster, and in various industrial applications.

(a) Epsom salt is Magnesium Sulfate Heptahydrate.
(b) Gypsum is Calcium Sulfate Dihydrate.
(d) Galena is Lead(II) sulfide.

3. What is the common name of magnesium sulphate heptahydrate? [S.S.C. Online CHSL (T-I) 27.01.2017 (Shift-III) ]

(a) Epsom salt
(b) Borax
(c) Gypsum
(d) lime

Correct Answer: (a) Epsom salt

Solution:Magnesium sulfate heptahydrate (MgSO₄.7H₂O) is commonly known as Epsom salt. It is a chemical compound often used in bath salts, as a laxative, and in gardening.

(b) Borax is Sodium Tetraborate Decahydrate.
(c) Gypsum is Calcium Sulfate Dihydrate.
(d) Lime can refer to Calcium Oxide ( $C a O$ ) or Calcium Hydroxide ( $C a (O H)₂$ ).

4. Which of the following is the common name of a natural admixture mineral of zinc carbonate and hydrous zinc silicate? [S.S.C. Online CGL (T-I) 24.08.2021 (Shift-II) ]

(a) Borax
(b) Benzol
(c) Calamine
(d) Chalk

Correct Answer: (c) Calamine

Solution:Calamine is a historical term for a mixture of zinc carbonate (

Z n C O₃

) and hydrous zinc silicate (

Z n₄ S i ₂ O₇ (O H) ₂ \cdotH₂O

). It is most widely known for its use in calamine lotion, an over-the-counter medication used to relieve itching and skin irritation.

(a) Borax is Sodium Tetraborate Decahydrate.
(b) Benzol is an old term for benzene.
(d) Chalk is primarily Calcium Carbonate.

5. Nitric acid does not react with— [S.S.C. Online Graduate Level (T-I) 31.08.2016 (Shift-II) ]

(a) Gold
(b) Copper
(c) Zinc
(d) Iron

Correct Answer: (a) Gold

Solution:Nitric acid (

H N O₃

) is a strong oxidizing acid. While it reacts with most common metals like copper, zinc, and iron, it generally does not react with gold because gold is a noble metal, meaning it is highly unreactive. Gold can only be dissolved by "aqua regia," a mixture of concentrated nitric acid and hydrochloric acid.

(b) Copper reacts with nitric acid.
(c) Zinc reacts with nitric acid.
(d) Iron reacts with nitric acid (though concentrated nitric acid can passivate iron).

6. An acid converts ________ to litmus. [S.S.C. Online CHSL (T-I) 11.01.2017 (Shift-I) ]

(a) Red, Blue
(b) Green, Yellow
(c) Blue, Red
(d) Yellow, Green

Correct Answer: (c) Blue, Red

Solution:An acid is a chemical compound that dissolves in water to give hydrogen ions (H⁺). Its pH value is less than 7. Acid turns blue litmus paper red.

7. Litmus paper changes to _______ colour when put in soap water. [S.S.C. Online C.H.S.L. (T-I) 06.08.2021 (Shift-II) ]

(a) yellow
(b) orange
(c) red
(d) blue

Correct Answer: (d) blue

Solution:Soap water is alkaline (basic). Bases turn red litmus paper blue. If blue litmus paper is put in soap water, it will remain blue. If red litmus paper were used, it would turn blue. The question implies the color change when put in soap water, and since acids turn blue litmus red, the opposite (bases turning litmus blue) is implied for a basic solution like soap water.

8. Acids turn blue litmus paper into which color? [S.S.C. Online MTS (T-I) 21.09.2017 (Shift-II) ]

(a) Green
(b) Red
(c) Pink
(d) Colorless

Correct Answer: (b) Red

Solution:This is a fundamental property of acids. Acids have a pH less than 7 and cause blue litmus paper to turn red.

9. Blue litmus paper turns ______ on contact with an acidic solution. [S.S.C. Online Graduate Level (T-I) 12.06.2019 (Shift-I) ]

(a) red
(b) yellow
(c) brown
(d) green

Correct Answer: (a) red

Solution:As established in previous questions, blue litmus paper is a classic indicator for acids. When it comes into contact with an acidic solution, it changes color to red.

10. During the fermentation of sugar, the compound which is always formed is— [S.S.C. Online Graduate Level (T-I) 9.09.2016 (Shift-II) ]

(a) Methyl Alcohol
(b) Ethyl Alcohol
(c) Acetic Acid
(d) Ethylene

Correct Answer: (b) Ethyl Alcohol

Solution:Fermentation, particularly alcoholic fermentation by yeast, involves the conversion of sugars (like glucose or fructose) into ethyl alcohol (ethanol) and carbon dioxide. This process is crucial in the production of alcoholic beverages and in bread making.

(a) Methyl Alcohol (methanol) is not typically formed during sugar fermentation.
(c) Acetic Acid is formed during acetic acid fermentation (vinegar production), but alcoholic fermentation of sugar primarily yields ethyl alcohol.
(d) Ethylene is a hydrocarbon gas, not a product of sugar fermentation.

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