Acid, Base and Salt – Old Year Questions

1. Antacids are –

(a) Base
(b) Acid
(c) Salt
(d) Buffer
(e) None of these

[Chhattisgarh P.C.S. (Pre) 2016]


2. Goldsmiths uses aqua regia, which is prepared by mixing–

(a) Nitric acid and Sulphuric acid
(b) Nitric acid and Hydrochloric acid
(c) Sulphuric acid and Hydrochloric acid
(d) Citric acid and Benzoic acid

[U.P.P.C.S. (Mains) 2014]


3. pH value shows the Numeric value of –

(a) Quality of chemical used for developing photographic negatives
(b) Analysing the acidic or basic nature of a solution
(c) Analysing the intensity of an earthquake
(d) Analysing to check the purity of milk

[M.P.P.C.S. (Pre) 1996]


4. The pH of a solution changes from 3 to 6. The H +ion concentration will :

(a) increase 3 times
(b) decrease 3 times
(c) decrease 10 times
(d) decrease 1000 times
(e) None of the above / More than one of the above

[66th B.P.S.C. (Pre) 2020]


5. Which of the following has a pH value of 7?

(a) Pure Water
(b) Neutral solution
(c) Basic solution
(d) Acidic solution
(e) None of the above/More than one of the above

[64th B.P.S.C (Pre) 2018]


6. A solution turns red litmus blue. The pH of the solution is :

(a) 7
(b) 1
(c) 5
(d) 6.5
(e) None of the above

[Chhattisgarh P.C.S. (Pre) 2014]


7. Which of the following may be a possible pH value of, an acidic solution?

(a) 6
(b) 7
(c) 8
(d) 9

[Chhattisgarh P.C.S. (Pre) 2018]


8. Which acid is considered a basic chemical in Industry?

(a) H2CO3
(b) HNO3
(c) H2SO4
(d) HCL

[43rd B.P.S.C. (Pre) 1994]


9. Which of the following is present in the maximum amount of acid rain?

(a) HCl
(b) HNO3
(c) H2SO4
(d) H2CO3
(e) None of the above/More than one of the above

[60th to 62nd B.P.S.C. (Pre) 2016]


10. The component(s) of acid rain is/are :

(a) HNO3
(b) H2SO4
(c) CO2
(d) Both (a) and (b)
(e) None of the above/More than one of the above

[66th B.P.S.C. (Pre) (Re. Exam) 2020]


11. Which acid is present in Acid Rain?

(a) Benzoic acid
(b) Acetic acid
(c) Nitric acid
(d) Oxalic acid
(d) None of the above

[Chhattisgarh P.C.S. (Pre) 2017]


12. An aqueous solution of copper sulphate is acidic in nature because the salt undergoes –

(a) dialysis
(b) electrolysis
(c) hydrolysis
(d) photolysis

[I.A.S. (Pre) 2001]


13. Which is not a Lewis acid?

(a) AlCl3
(b) BF3
(c) NH3
(d) FeCl3

[Jharkhand P.C.S. (Pre) 2013]


14. Assertion (A): To dilute sulphuric acid, acid is added to water and not water to acid. Reason (R): The specific heat of water is very high.

(a) Both (A) and (R) are true, and (R) is the correct explanation of (A).
(b) Both (A) and (R) are true, but (R) is not a correct explanation of (A).
(c) (A) is true, but (R) is false.
(d) (A) is false, but (R) is true.

[I.A.S. (Pre) 1999]


15. Limewater is turned milky by:

(a) CO
(b) CO2
(c) O2
(d) O3
(e) None of the above / More than one of the above

[66th B.P.S.C. (Pre) 2020]


16. Sodawater obtained by passing carbon dioxide in water is :

(a) An oxidising agent
(b) Basic in nature
(c) Acidic in nature
(d) A reducing agent

[R.A.S./R.T.S.(Pre) 1999]


17. Which of the following acids do not contain oxygen –

(a) Nitric Acid
(b) Sulphuric Acid
(c) Hydrochloric Acid
(d) All of the above

[R.A.S./R.T.S. (Pre) 1992]


18. An unknown gas quickly dissolves in water. This the gaseous aqueous solution turns red litmus into blue. This gas produces a white flame with hydrogen chloride. This unknown gas is –

(a) Sulphur dioxide
(b) Nitric Hydroxide
(c) Ammonia
(d) Carbon monoxide

[R.A.S./R.T.S. (Pre) 1994]


19. Match List-I with List-II and select the correct answer from the code given below the lists.

List-I List-II
A. Bleaching powder 1. Sodium bicarbonate
B. Baking soda 2. Sodium carbonate
C. Washing powder 3. Calcium oxychloride
D. Plaster of Paris 4. Calcium sulphate hemihydrate

Code :

(a) 3 4 2 1
(b) 2 3 4 1
(c) 3 1 2 4
(d) 4 3 1 2

[U.P. R.O./A.R.O. (Mains) 2016]


20. What is Neela Thotha?

(a) Copper Sulphate
(b) Calcium Sulphate
(c) Iron Sulphate
(d) Sodium Sulphate

[M.P.P.C.S. (Pre) 1990]


21. The chemical used for destroying fungi in water tank is:

(a) Nitric acid
(b) Zinc sulphate
(c) Magnesium sulphate
(d) Copper Sulphate
(e) None of the above/More than one of the above

[66th B.P.S.C. (Pre) (Re. Exam) 2020]


22. Blue vitriol is chemically:

(a) Sodium sulfate
(b) Nickel sulfate
(c) Copper sulfate
(d) Iron sulfate
(e) None of the above/More than one of the above

[63rd B.P.S.C. (Pre) 2017]


23. Match the following lists by using the codes given below. Select the correct answer.

List-1 List – II
A. Washing soda 1. Sodium Hydroxide
B. Caustic soda 2. Copper Sulphate
C. Neela thotha 3. Sodium Thiosulphate
D. Hypo 4. Sodium Carbonate


A   B   C   D
(a)  1342
(b)  4123
(c)  4231
(d)  3214

[U.P. Lower Sub. (Pre) 2002]


24. Match the following lists by using the codes given below. Select the correct answer.

List-I List – II
A. Neela thotha  1. Sodium bicarbonate
B. Epsom salt  2. Sodium Hydroxide
C. Baking soda  3. Magnesium Sulphate
D. Caustic soda  4. Copper Sulphate


A   B   C   D
(a)  3421
(b)  4321
(c)  3412
(d)  4312

[I.A.S.. (Pre) 1998]


25. Baking soda is –

(a) Sodium Chloride
(b) Sodium Bicarbonate
(c) Sodium Sulphate
(d) Sodium Hydroxide

[R.A.S./R.T.S. (Pre) 1993]


26. Baking Soda is –

(a) Sodium Hydrogen Carbonate
(b) Sodium Dihydrogen Carbonate
(c) Disodium Hydrogen Carbonate
(d) Sodium Carbonate
(e) None of these

[Chhattisgarh P.C.S. (Pre) 2016]


27. The chemical formula of baking soda is :

(a) Ca(OH)
(b) NaHCO
(c) CaCO
(d) NaCO

[R.A.S./R.T.S. (Pre) 2016]


28. Baking soda is –

(a) Na, CO,
(c) NaHCO
(b) NaHCO, 6H_O
(d) NaCO, 10H0

[Chhattisgarh P.C.S. (Pre) 2018]


29. The chemical formula of washing soda is :

(a) NaOH
(b) NaCO
(c) NaHCO3
(d) Ca(OH)2

[43rd B.P.S.C. (Pre) 1994]


30. Consider the following statements-
(1) Anhydrous Sodium carbonate is commonly known as baking sodium (baking soda).
(2) Baking soda is used as a fire extinguisher.
(3) Bleaching powders are produced in the Hasnclaver plant.
Which of these statements is right :

(a) 1, 2 and 3
(b) 2 and 3
(c) only 3
(d) 1 and 2

[I.A.S. (Pre) 2005]


31. Match List – I with List – II and select the correct answer using the codes given below the Lists :
List – I List – II
A. Artificial fruits ripening 1. Carbon dioxide
B. Baking Soda 2. Sodium silicate
C. Soft Drink 3. Ethylene
D. Quartz 4. Sodium bicarbonate
Code :

(a) 3 4 2 1
(b) 3 4 1 2
(c) 4 3 2 1
(d) 2 1 4 3

[U.P. P.C.S. (Mains) 2017]


32. Quartz crystals used in clocks are :

(a) Sodium silicate
(b) Silicon dioxide
(c) Germanium oxide
(d) Titanium dioxide
(e) None of the above/More than one of the above

[63rd B.P.S.C. (Pre) 2017]


33. Which one of the following salt predominant in the ocean?

(a) Calcium Carbonate
(b) Sodium Chloride
(c) Potassium Chloride
(d) Magnesium Sulphate

[Uttarakhand U.D.A./L.D.A. (Pre) 2003]


34. Table salt (NaCl) is a product of –

(a) Weak acid and weak base
(b) Strong acid and strong base
(c) Weak acid and strong base
(d) Strong acid and weak basic

[53rd to 55th B.P.S.C. (Pre) 2011]


35. Which one of the following salts should not be used as dining table salt?

(a) Iodized salt
(b) Sea salt
(c) Rock salt
(d) Processed common salt

[U.P.R.O./A.R.O (Pre) 2014]


36. Iodized salt contains :

(a) Free iodine
(b) Calcium iodide
(c) Magnesium iodide
(d) Potassium iodide
(e) None of the above/More than one of the above

[60th to 62nd B.P.S.C. (Pre) 2016]


37. Which one of the following statements is not correct?

(a) The presence of NaCl increases the rate of setting of Plaster of Paris
(b) Gypsum is added to the cement to slow down its rate of setting
(c) All alkaline earth metals form hydrated salts
(d) Barium and Strontium are found free in nature

[I.A.S. (Pre) 2003]


38. What is untrue about bleaching powder?

(a) It is more soluble in water
(b) It is the powder of light yellow colour
(c) It is an oxidant
(d) It releases chlorine after reaction with dilute acid

[39th B.P.S.C. (Pre) 1994]


39. Which chemical compound is present in Bleaching Powder?

(a) Calcium Hydroxide
(b) Calcium Oxychloride
(c) Calcium Carbonate
(d) Ammonium Chloride

[U.P.U.D.A./L.D.A. (Spl.) (Mains) 2010]


40. When eno salt is poured into the water, bubbles form, which is due to –

(a) O2 gas
(b) CO2 gas
(c) CO gas
(d) H2 gas

[R.A.S./R.T.S. (Pre) 1999]


41. To develop photographic plates –

(a) Sodium thiosulphate is used as an oxidizing agent.
(b) Free bromine releases.
(c) Light affected area quickly oxidizes.
(d) The solution is kept developing until all the bromide is not dissolved.

[R.A.S./R.T.S. (Pre) 1994]


42. Which one of the following substances is used in photography and also as an antichlor?

(a) Chrome red
(b) Sodium thiosulphate
(c) Hydrogen peroxide
(d) Calomel

[U.P.P.C.S. (Mains) 2010]


43. The chemical used as a ‘fixer’ in photography is –

(a) Sodium sulphate
(b) Sodium thiosulphate
(c) Ammonium persulphate
(d) Borax

[I.A.S. (Pre) 1995]


44. The chemical used as a fixer in the photography is –

(a) Sodium thiosulphate
(b) Borax
(c) Sodium tetrathionate
(d) Ammonium molybdate

[U.P.R.O./A.R.O. (Pre) 2014]


45. The hypo solution used in photography is an aqueous solution of –

(a) Sodium thiosulphate
(b) Sodium tetrathionate
(c) Sodium sulphate
(d) Ammonium per sulphate

[U.P.P.C.S (Pre) 2010]


46. The useful element in photography is –

(a) Silver Nitrate
(b) Silver Bromide
(c) Sulphuric Acid
(d) Citric Acid

[U.P.P.C.S (Pre) 1992]


47. Which one of the following is coated on the photographic plate?

(a) Silver oxide
(b) Silver bromide
(c) Silver chloride
(d) Silver iodide

[U.P.P.C.S. (Mains) 2015]


48. Which one of the following substances is used in glazing the pottery?

(a) Alum
(b) Calomel
(c) Zinc chloride
(d) Zinc oxide

[U.P.P.C.S (Mains) 2015]


49. Which of the following imparts a deep blue colour to glass?

(a) Cobalt oxide
(b) Cupric oxide
(c) Ferric oxide
(d) Nickel oxide

[U.P. R.O./A.R.O. (Mains) 2017]


50. With reference to ionic compounds, consider the following statements :
1. Ionic compounds are insoluble in alcohol.
2. Ionic compounds in the solid state are a good conductor of electricity.
Which of these statements is/are correct?

(a) Only 1
(b) Only 2
(c) Both 1 and 2
(d) Neither 1 nor 2

[I.A.S. (Pre) 2003]