Miscellaneous And Useful Chemical Compounds (Part-I)

Total Questions: 50

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

Correct Answer: (a) Gold
Solution:Gold generally does not react with any acid, but it quickly dissolves in aqua regia, which is a mixture of one part nitric acid and three parts hydrochloric acid. In the above options, nitric acid reacts with all others except gold.

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

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.

13. Litmus paper changes to _____ colour when put in soap water. [S.S.C. Online CHSL (T-I) 06.08.2021 (Shift-II)]

Correct Answer: (d) blue
Solution:Soap is made by means of basic salts. Hence the aqueous solution of soap or the value of soap becomes alkaline. Therefore, the litmus paper put in it turns blue, because litmus gives blue color with alkali.

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

Correct Answer: (b) Red
Solution:All acids, if contacted with litmus paper, turn blue litmus paper red. Acids and bases are recognized by litmus. Red litmus paper is used to identify bases because bases turn red litmus blue.

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

Correct Answer: (a) red
Solution:All acids, if contacted with litmus paper, turn blue litmus paper red. Acids and bases are recognized by litmus. Red litmus paper is used to identify bases because bases turn red litmus blue.

16. 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)]

Correct Answer: (b) Ethyl Alcohol
Solution:During the fermentation of sugar, ethyl alcohol is formed and carbon dioxide gas is formed.
C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂ + Energy

17. Ethanol is produced by which process? [S.S.C. Online Constable GD 2.03.2019 (Shift-I)]

Correct Answer: (d) Fermentation
Solution:The chemical formula of ethanol or ethyl alcohol is C₂H₅OH.

18. What will be the formula of fructose? [C.P.O. S.I. 6.06.2016 (Shift-I)]

Correct Answer: (b) C₆H₁₂O₆
Solution:The chemical formula of fructose is C₆H₁₂O₆. It is a monosaccharide found in sweet fruits. Fructose is soluble in water, alcohol, or ether.

19. _____ the correct formula for ammonium phosphate [S.S.C. Online MTS (T-I) 9.10.2017 (Shift-I)]

Correct Answer: (c) (NH₄)₃PO₄
Solution:The formula for ammonium phosphate is [(NH₄)₃PO₄].

20. Which of the following acts as best adsorbent? [S.S.C. Online Graduate Level (T-I) 9.09.2016 (Shift-II)]

Correct Answer: (c) Activated Coconut Charcoal
Solution:Activated coconut charcoal is the best adsorbent among the given options. It is also useful in making masks and has a relatively high ability to absorb toxic gases.