Discussion
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- Question
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
- Correct Answer
- 5x/36
- 1. The molecular formula of phosphorous is
Options- A. P1
- B. P2
- C. P3
- D. P4 Discuss
- 2. 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
- 3. The octane number of zero is assigned to
Options- A. 2-methyl octane
- B. n-heptane
- C. iso-octane
- D. 3-methyl octane Discuss
- 4. The material which can be deformed permanently by heat and pressure is called a
Options- A. thermoplastic
- B. thermoset
- C. chemical compound
- D. polymer Discuss
- 5. The items amenable to detection by soft x-rays are
Options- A. contrabands
- B. lead in bullets
- C. narcotics
- D. genuine coins from counterfeit coins Discuss
- 6. The most important ore of aluminium is
Options- A. bauxite
- B. magnetite
- C. haematite
- D. monazite Discuss
- 7. 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
- 8. 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 Discuss
- 9. The number of electrons presents in H+ is
Options- A. zero
- B. one
- C. two
- D. three Discuss
- 10. The inherited traits of an organism are controlled by
Options- A. RNA molecules
- B. nucleotides
- C. DNA molecules
- D. enzymes Discuss
Chemistry problems
Search Results
Correct Answer: P4
Correct Answer: boiling
Correct Answer: n-heptane
Correct Answer: thermoset
Correct Answer: genuine coins from counterfeit coins
Correct Answer: bauxite
Correct Answer: 1 proton only
Correct Answer: 0.01 minute
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
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