Discussion
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- Question
The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?
Options- A. 3 billion years
- B. 100 years
- C. 0.01 minute
- D. 13 days
- Correct Answer
- 0.01 minute
- 1. The nucleus of a hydrogen atom consists of
Options- A. 1 proton only
- B. 1 proton + 2 neutron
- C. 1 neutron only
- D. 1 electron only Discuss
- 2. The most important ore of aluminium is
Options- A. bauxite
- B. magnetite
- C. haematite
- D. monazite Discuss
- 3. The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is
Options- A. 5x/36
- B. 5x
- C. 7.2 x
- D. x/6 Discuss
- 4. The molecular formula of phosphorous is
Options- A. P1
- B. P2
- C. P3
- D. P4 Discuss
- 5. The method that cannot be used for removing permanent hardness of water is
Options- A. adding sodium carbonate
- B. distillation
- C. adding caustic soda
- D. boiling Discuss
- 6. The number of electrons presents in H+ is
Options- A. zero
- B. one
- C. two
- D. three Discuss
- 7. The inherited traits of an organism are controlled by
Options- A. RNA molecules
- B. nucleotides
- C. DNA molecules
- D. enzymes Discuss
- 8. The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3
Options- A. 4
- B. 5
- C. 2
- D. zero Discuss
- 9. The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in
Options- A. 1.8 gram of H2O
- B. 12 moles of KMnO4
- C. 0.6N H2SO4
- D. 4.6 gram of C2H5OH Discuss
- 10. The most commonly used bleaching agent is
Options- A. alcohol
- B. carbon dioxide
- C. chlorine
- D. sodium chlorine Discuss
Chemistry problems
Search Results
Correct Answer: 1 proton only
Correct Answer: bauxite
Correct Answer: 5x/36
Correct Answer: P4
Correct Answer: boiling
Correct Answer: zero
Explanation:
H+ is a hydrogen ion, and it is an ion because it LOST an electron. Electrons are negatively charged. When an atom gains electrons it will have NEGATIVE charges.
So it has zero electron.
Correct Answer: DNA molecules
Correct Answer: 4
Correct Answer: 12 moles of KMnO4
Correct Answer: chlorine
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