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In a sample of H-atoms electrons are de-...

In a sample of H-atoms electrons are de-exicited from `4^(th)` excited state to ground state. Which is/are correct statement ?

A

No corrosion takes place in vaccum

B

Corrosion is protected by electroplating

C

During rusting `Fe_2O_3*xH_2O` formed

D

In presence of electrolyte, corrosion takes place with greater rate

Text Solution

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The correct Answer is:
A, B, C, D
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Knowledge Check

  • The electron in a hydrogen atom makes a transition from an excited state to the ground state. Which of the following statements is true?

    A
    Its kinetic energy increases and its potential and total energies decrease.
    B
    Its kinetic energy decreases, potential energy increases, and its total energy remain the same.
    C
    Its kinetic and total energies decrease and its potential energy increases
    D
    Its kinetic, potential and total energies decrease

  • The electron in a hydrogen atom makes a transition from an excited state to the ground state. Which of the following statements is true ?

    A
    Its kinetic energy increases and its potential and total energies decrease.
    B
    Its kinetic energy decreases, potential energy increases, and its total energy remain the same.
    C
    Its kinetic and total energies decrease and its potential energy increases
    D
    Its kinetic, potential and total energies decrease

  • When a greater number of electrons from excited hydrogen atoms reach the ground state, then

    A
    The intensity of spectral lines in Lyman series increases
    B
    The number of lines in Lyman series increases
    C
    Both the intensity and number lines in Lyman series increases.
    D
    There is no observable change in spectrum

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