All Exams Test series for 1 year @ ₹349 only
Question

Number of electrons present in the species H2, He, H2 and O2 respectively are:

This question was previously asked in
CDS 2 2025 Maths Question Paper (14-Sep-2025)
The correct answer is

1, 2, 2, 15

The number of electrons in H2 (1 electron per H atom, so 2 electrons), He (2 electrons), H2 (1 electron per H atom, so 2 electrons), and O2 (16 electrons) are correct as per option (a).

Was this answer helpful?

Similar Questions

  1. Consider the following statements regarding bases and alkalis :
    1. All bases dissolve in water.
    2. Bases which are soluble in water are called alkalis.
    3. An alkali is soapy to touch, bitter and corrosive.
    4. Addition of water to an alkali generates heat.
    Which of the statements given above are correct ?
  2. A solution with a pH value less than 7 is a/an :

Important Questions from Acids, Bases & Salts

  1. Name the gas used in preparation of bleaching powder.
  2. Which of the following statements is correct according to the law of conservation of mass?

  3. Which of the following is formed when carbon dioxide reacts with calcium hydroxide?

  4. Which of the following types of reaction represents formation of slaked lime from calcium oxide and water?

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

Need Expert Advice?
Test Series
CDS img
Defence
UPSC CDS 2026 Mock Test Series
536 Tests 4 Tests Free
1647 Attempts
4.3(174)
English, Hindi
More Questions from CDS

Start Your Preparation with Prepp Mobile App

Download the app from Google Play & App Store
Download the app from Google Play & App Store
Prepp Mobile App