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NDA GK Previous Papers Chapterwise MCQs - Acids, Bases and Salts
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NDA GK Previous Papers Chapterwise MCQs - Acids, Bases and Salts
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25 Questions

1. The pH of fresh milk is 6. When it turns sour, the pH
2. What is the oxidizing agent in the following equation? HAsO2(aq) + Sn2+ (aq) + H+ (aq) → As (s) + Sn4+ (aq) + H2O (l)
3. In a redox reaction, Na2S2O3 changes to Na2S4O6. What is the equivalent weight of Na2S2O3 ?
4. Which one of the followings an oxidation-reduction reaction?
5. The cleaning action of soap and detergent in water is due to the formation of
6. An oxidising agent is a substance which
7. The following equation is an example of a redox reaction, in which Cl2 is the oxidizing agent and FeBr3 is the reducing agent : 2FeBr3 (aq) + 3Cl2 (g) = 2FeCl3(aq) + 3Br2 (1) Which one among the following statements is incorrect for this redox reaction?
8. Human stomach produces acid 'X' which helps in digestion of food. Acid 'X' is
9. Boric acid is an acid because its molecule:
10. In oxidation
1. Hydrogen is displaced from a substance.
2. an electropositive element is added to or proportion of electropositive element increases in a substance. Select the correct answer using the code given below:
11. Two elements gallium and oxygen combine to form a compound Ga2O3. Which among the following is the valency of gallium ?
12. Which one of the following is the correct order of oxidation number of Iodine(I) in I2, HI, HIO4 and ICI?
13. In surgery, metal pins are used for joining together broken bones. These metal pins remain uncorroded in the body. What is the material of these pins ?
14. Turmeric (Haldi) rapidly becomes colourless on addition of
15. Sometimes, indigestion is caused by the secretion of too much hydrochloric acid in the stomach. To ease the pain caused, a tablet can be taken that reacts to reduce the amount of acid present. Which one among the following would be inappropriate for a manufacturer to include as a major reactant in the tablet?
16. The pH of the solution obtained by dissolving pure sodium chloride in water is
17. Match List I with List II and select the correct answer using the code given below the Lists :List I List II (Compound) (Nature)
A. Sodium hydroxide 1. Strong acid
B. Calcium oxide 2. Alkali
C. Acetic acid 3. Weak acid
D. Hydrochloric acid 4. BaseCode: A B C D
18. Suppose you have four test tubes labelled as 'A', 'B', 'C', and 'D'. 'A' contains plain water, 'B' contains solution of an alkali, 'C' contains solution of an acid, and 'D' contains solution of sodium chloride. Which one of these solutions will turn phenolphthalein solution pink?
19. Consider the following: The concentrate in of hydrogen ions in an aqueous solution is expressed by its
1. pH 2. pOH
3. pKa 4. pKw which of the statements given above is/are correct?
20. Which of the following element combinations will form ionic compounds?
1. Ca (Z = 20) and Ti (Z = 22)
2. Si (Z = 14) and Br (Z = 35)
3. Mg (Z = 12) and Cl (Z = 17) Select the correct answer using the code given below.
21. Arrange the following bases in increasing order of their, basic strength
1. Sodium hydroxide
2. Magnesium hydroxide
3. Aluminium hydroxide
4. Ammonium hydroxide Select the correct answer using the code given belowCodes: A B C D
22. Which one among the following is an electrochemical cell that cannot be charged ?
23. Which one of the following is a reduction reaction?
24. Bases turn red litmus blue and acids turn blue litmus red. A student tested a liquid with a red litmus paper and it stayed red with no change. This shows that the liquid
25. The solution of which one of the following will have pH less than 7?

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