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Chemistry (Part-VI)

📆 October 29, 2024

Total Questions: 50

11. The boiling point of liquids varies as- [S.S.C. Online Graduate Level (T-I) 27.08.2016]

Correct Answer: (a) Pressure varies
Solution:The variation in the boiling point of liquids is the difference in their vapor pressures. There is also a difference in the intermolecular forces acting between the molecules of the molecule in different liquids, due to which the vapor pressure of these liquids on heating is also different. Hence the boiling points also differ.

12. An eudiometer measures- [S.S.C. Online Graduate Level (T-I) 2.09.2016]

Correct Answer: (c) Volume of gases
Solution:A eudiometer is measures the change in the volume of gases during a chemical reaction. It is a scaled glass tube (glass test tube) in which a mixture of gases is reacted by an electric spark and measures the change in their volumes.

13. Which of the following has pH value 7? [S.S.C. Online Graduate Level (T-I) 11.09.2016]

Correct Answer: (a) Pure Water
Solution:Pure water has a pH of 7. The pH value is actually a measure of the concentration of hydrogen ions in a liquid, by which the acidity or alkalinity of a liquid is checked. Liquids with a pH value less than 7 are acidic and liquids with a pH value greater than 7 are alkaline in nature. The pH value of water is 7 which means that it is a neutral liquid, but only for pure water this value is approximately equal to 7.

14. The pH of a liquid was found to be 7. Which liquid is it likely to be? [S.S.C. Online CHSL (T-I) 18.03.2020]

Correct Answer: (a) Water
Solution:Pure water has a pH of 7. The pH value is actually a measure of the concentration of hydrogen ions in a liquid, by which the acidity or alkalinity of a liquid is checked. Liquids with a pH value less than 7 are acidic and liquids with a pH value greater than 7 are alkaline in nature. The pH value of water is 7 which means that it is a neutral liquid, but only for pure water this value is approximately equal to 7.

15. What is the neutral value of the pH scale? [S.S.C. Online Constable GD 18.02.2019]

Correct Answer: (b) Equal to 7
Solution:Pure water has a pH of 7. The pH value is actually a measure of the concentration of hydrogen ions in a liquid, by which the acidity or alkalinity of a liquid is checked. Liquids with a pH value less than 7 are acidic and liquids with a pH value greater than 7 are alkaline in nature. The pH value of water is 7 which means that it is a neutral liquid, but only for pure water this value is approximately equal to 7.

16. What is the pH of water? [S.S.C. Online CHSL (T-1) 19.01.2017]

Correct Answer: (a) 7
Solution:Pure water has a pH of 7. The pH value is actually a measure of the concentration of hydrogen ions in a liquid, by which the acidity or alkalinity of a liquid is checked. Liquids with a pH value less than 7 are acidic and liquids with a pH value greater than 7 are alkaline in nature. The pH value of water is 7 which means that it is a neutral liquid, but only for pure water this value is approximately equal to 7.

17. What is the pH value of acidic substances? [S.S.C. Online C.H.S.L. (T-1) 12.08.2021]

Correct Answer: (a) Below 2.0
Solution:In chemistry, pH is a measure used to determine the acidity or alkalinity of an aqueous solution. The pH scale ranges from 0 to 14. The mean or neutral position on this scale is 7. The pH value of pure water is 7,1.c... it is neither acidic nor alkaline, it is called a neutral state. Aqueous solutions with a pH value less than 7 are acidic and solutions with a pH value greater than 7 are alkaline.

18. What does 'p' stand for in pH? [S.S.C. Online M.T.S. (T-I) 13.10.2021]

Correct Answer: (c) Potenz
Solution:pH expresses the concentration of Hions in a solution. In this, P has been used for the German word Potenz, which means the power of hydrogen i.e. strength or power of hydrogen ion (H) in solution.

19. pH of lemon juice is 4, which means it is_________. [S.S.C. Online MTS (T-I) 3.10.2017]

Correct Answer: (b) Acidic
Solution:The pH value of lemon juice is 4, i.e, it is less than 7. Hence, this juice will be acidic in nature

20. Which of the following substances have a pH value that is closest to zero? [S.S.C. Online MTS (T-I) 20.08.2019]

Correct Answer: (a) Concentrated Hydrochloric Acid (HCI)
Solution:with a pH of less than 7 show acidic properties. Therefore, concentrated hydrochloric acid has a pH of about 2, while that of concentrated sodium hydroxide is 14. Daking soda has a pif of about 8, animonia has a pH of about 11.6, and pure water has a pH of 7 Hence it is clear that the lowest pH value (near zero) among the given alternatives is that of concentrated hydrochloric acid.
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