Chemistry · Chapter 6 of 11

Reactions & Catalysis: BPSC & UPPCS Prelims PYQs

10 previous-year questions on Reactions & Catalysis. Each one opens to its answer and explanation.

1. 1. 70th BPSC Prelims 2024

   Which of the following are exothermic processes?
   i. Evaporation of water.
   ii. Dilution of an acid (H2SO4).
   iii. Reaction of water with quick lime.
   iv. Sublimation of camphor (crystals).

   1. Aiii and iv
   2. Bii and iii
   3. Ci and iv
   4. Di and ii
   Answer and explanation →

2. 2. 70th BPSC Prelims 2024

   Which of the following pairs will give displacement reactions?

   1. AAgNO3 solution and copper metal
   2. BNaCl solution and copper metal
   3. CFeSO4 solution and silver metal
   4. DMgCl2 solution and aluminium metal
   Answer and explanation →

3. 3. 70th BPSC Prelims 2024

   Standard electrode potential of three metals A, B and C are respectively 0.5 V, -3 V and -1.2 V. Reducing power of these metals would be

   1. AA > C > B
   2. BB > C > A
   3. CC > B > A
   4. DNone of the above
   Answer and explanation →

4. 4. 70th BPSC Prelims 2024 Asked again

   Catalyst used in hydrogenation of vegetable oil into vanaspati ghee is

   1. APd
   2. BFe
   3. CNi
   4. DNone of the above
   Answer and explanation →

5. 5. 70th BPSC Prelims 2024

   The conductivity of a strong electrolyte

   1. ADecreases on dilution
   2. BDoes not change with dilution
   3. CIncreases slightly on dilution
   4. DNone of the above
   Answer and explanation →

6. 6. 69th BPSC Prelims 2023

   Which of the following slows down the reaction rate?

   1. ACatalytic promoter
   2. BHomogeneous catalyst
   3. CHeterogeneous catalyst
   4. DNone of the above
   Answer and explanation →

7. 7. 68th BPSC Prelims 2023

   Detect the odd one.

   1. ARipening of fruit
   2. BSetting of cement
   3. CBurning of coal
   4. DMore than one of the above
   5. ENone of the above
   Answer and explanation →

8. 8. 67th BPSC Prelims 2022

   What happens to the weight of iron, when it rusts?

   1. ADecreases then increases
   2. BIncreases then decreases
   3. CRemains same
   4. DIt increases for a long time
   5. ENone of the above/More than one of the above
   Answer and explanation →

9. 9. 66th BPSC Prelims 2020

   Faraday constant

   1. Adepends on the amount of the electrolyte
   2. Bdepends on the current passed in the electrolyte
   3. Cdepends on the volume of the solvent in which the electrolyte is dissolved
   4. Dis a universal constant
   5. ENone of the above / More than one of the above
   Answer and explanation →

10. 10. 66th BPSC Prelims 2020 Asked again

    Limewater is turned milky by

    1. ACO
    2. BCO2
    3. CO2
    4. DO3
    5. ENone of the above / More than one of the above
    Answer and explanation →