Chemistry · JEE

Easy Nature of electromagnetic radiation, photoelectric effect, spectrum of the hydrogen atom MCQs for JEE

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Part of Atomic Structure in JEE Main Chemistry.

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Q1ChemistryUnit 2: Atomic Structure

Which of the following statements is incorrect?

Q2ChemistryUnit 2: Atomic Structure

Radiation of wavelength 242 nm is sufficient to ionize the sodium atom. Calculate the ionization energy in

\boldsymbol{k J} \boldsymbol{m o l}^{-1} \cdot\left(\boldsymbol{n}=\mathbf{6 . 6 2 5} \times \mathbf{1 0}^{-\mathbf{3 4}} \boldsymbol{J}-\boldsymbol{s}\right)

Q3ChemistryUnit 2: Atomic Structure

Which of the following statements is not true about canal rays?

Q4ChemistryUnit 2: Atomic Structure

A sample of water is vaporized and tested in a mass spectrometer. There are 3 isotopes of hydrogen,

1 H,^{2} H

and 3. H. There are 2 isotopes of oxygen,

^{15} \boldsymbol{O}

and

^{16}

O. How many peaks would be expected to be found on the mass spectrum?

Q5ChemistryUnit 2: Atomic Structure

In a measurement of quantum efficiency of photosynthesis in green plants, it was found that 10 quanta of red light of wavelength

6850 A

were needed to release one molecule of

\boldsymbol{O}_{2}

The average energy storage in this process is 112 kcal per mol of

O_{2}

evolved. What is the energy conversion efficiency in this experiment? Given: 1 cal

=4.18 J ; N_{A}=6 \times

\mathbf{1 0}^{\mathbf{2 3}} ; \boldsymbol{h}=\mathbf{6 . 6 3} \times \mathbf{1 0}^{-\mathbf{3 4}} \boldsymbol{J} . \boldsymbol{s}

Q6ChemistryUnit 2: Atomic Structure

X

-rays are produced when a stream of electrons in an

X

-ray tube:

Q7ChemistryUnit 2: Atomic Structure

Electromagnetic radiation with maximum wavelength is:

Q8ChemistryUnit 2: Atomic Structure

Which among the following is correct about

\gamma-

rays ?

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