General Science Chemistry MCQs

Chemistry Objective (Multiple Choice) General Knowledge Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examination

51. What is the difference between the mass number of Parent nucleus and Daughter nucleus in an alpha-decay process?

[A] 2
[B] 4
[C] 6
[D] 8

Show Answer

52. Which of these processes is responsible for the energy released in an atom bomb?

[A] Nuclear Fission
[B] Nuclear Fusion
[C] Gamma decay
[D] None

Show Answer

53. Which of the following gas is used to prevent the chips from getting oxidised?

[A] Oxygen
[B] Nitrogen
[C] Helium
[D] Lithium

Show Answer

54. Which of the following equation represents combination of Hydrogen gas with nitrogen to form ammonia?

[A] 2H2 + N –> NH3
[B] 2H + N3 –> NH3
[C] 3H2 + N2 –> 2NH3
[D] None of the above

Show Answer

55. Which of the following is correct about the properties of the elements as per the Mendeleev’s Periodic Law?

[A] they are a periodic function of the element’s atomic number
[B] they are a periodic function of the element’s atomic weight
[C] they don’t depend on the element’s atomic weight
[D] they are same for every 4th element

Show Answer

56. Which of the following was equal to the atomic weight of the middle element in the Dobereiner’s Triads?

[A] arithmetic mean of the atomic weights of the other two elements
[B] geometric mean of the atomic weights of the other two elements
[C] difference between the atomic weights of the other two elements
[D] sum of the atomic weights of the other two elements

Show Answer

57. Who gave the law of octaves for arrangement of elements?

[A] Lothar Meyer
[B] Dmitri Mendeleev
[C] John Alexander Newlands
[D] Johann Dobereiner

Show Answer

58. Which of the following is correct about Mendeleev’s Periodic Table?

[A] Argon is placed before Potassium
[B] Cobalt is placed before Nickel
[C] Tellurium is placed before iodine
[D] All of the above

Show Answer

59. Which of the following elements have ns1 outermost electronic configuration?

[A] s-block elements
[B] p-block elements
[C] d-block elements
[D] f-block elements

Show Answer

60. Which of the following elements is identified by the 7th group and 4th period of the modern periodic table?

[A] Copper
[B] Iron
[C] Manganese
[D] Chromium

Show Answer

Advertisement

Kindly help us to keep GKToday updated and error free. Use this form to report error or outdated information in questions. We shall rectify asap...