The Lyman series corresponds to the emission lines of hydrogen atom due to the transitions of the type n → 1 ( 2 → 1 , 3 → 1 , 4 → 1 , etc ) where n is the principal quantum number of the excited state. The ionization energy of the hydrogen atom can be determined by plotting:

Frequency differences between successive emission lines vs emission frequencies

Frequency differences between successive emission lines vs n

Van der Waal's equation for a gas is stated as, P = nRT V - nb - a n V 2 . This equation reduces to the perfect gas equation, P = nRT V When,

temperature is sufficiently high and pressure is low.

both temperature and pressure are very low.

both temperature and pressure are very high.

temperature is sufficiently low and pressure is high.

Identify the correct labels of A , B and C in the following graph from the options given below: Root mean square speed V r m s ; most proable speed V m p ; Average speed V a v

A - V mp ; B - V av ; C - V rms

A - V mp ; B - V rms ; C - V av

A - V av ; B - V rms ; C - V mp

A - V rms ; B - V mp ; C - V av

HARD

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The study of emission or absorption spectra is referred to as

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Important Questions on Structure of Atom

EASY

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

The intermolecular interaction that is dependent on the inverse cube of distance between the molecules is:

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

The Lyman series corresponds to the emission lines of hydrogen atom due to the transitions of the type

n \to 1 (2 \to 1, 3 \to 1, 4 \to 1

, etc ) where

n

is the principal quantum number of the excited state. The ionization energy of the hydrogen atom can be determined by plotting:

EASY

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

The number of following statement/s which is/are incorrect is ______

A) Line emission spectra are used to study the electronic structure

B) The emission spectra of atoms in the gas phase show a continuous spread of wavelength from red to violet.

C) An absorption spectrum is like the photographic negative of an emission spectrum

D) The element helium was discovered in the sun by spectroscopic method

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

According to the following diagram, A reduces

B O_{2}

when the temperature is:
Question Image

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

The ratio of the highest to the lowest wavelength of Lyman series is

HARD

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

Van der Waal's equation for a gas is stated as,

P = \frac{nRT}{V - nb} - a {(\frac{n}{V})}^{2}

.

This equation reduces to the perfect gas equation,

P = \frac{nRT}{V}

When,

EASY

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

Which of the following is correct?

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

A diatomic molecule

X_{2}

has a body-centred cubic

(bcc)

structure with a cell edge of

300 pm .

The density of the molecule is

6.17 {gcm}^{- 3} .

The number of molecules present in

200 g

X_{2}

is :
(Avogadro constant

(N_{A}) = 6 \times 10^{23} {mol}^{- 1}

)

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

The spectrum of Helium is expected to be similar to that of____

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

The product obtained after positron emission from

{}_{31}{Ga}^{68}

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

Identify the correct labels of

A, B

and

C

in the following graph from the options given below:
Question Image

Root mean square speed

(V_{r m s});

most proable speed

(V_{m p});

Average speed

(V_{a v})

HARD

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

The correct representation of wavelength intensity relationship of an ideal black body radiation at two different temperatures

T_{1}

and

T_{2}

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

A $20.0 mL$ solution containing $0.2 g$ impure $H_{2} O_{2}$ reacts completely with $0.316 g$ of ${KMnO}_{4}$ in acid solution. The purity of $H_{2} O_{2}$ (in $%$ ) is______ (mol. wt. of $H_{2} O_{2} = 34$ ; mol. wt. of ${KMnO}_{4} = 158$ )

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

When does a gas deviate the most from its ideal behavior?

EASY

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

A sample of red ink (a colloidal suspension) is prepared by mixing eosine dye, egg white,

HCHO

and water. The component which ensures stability of the ink sample is :

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

For Freundlich adsorption isotherm, a plot of

\log (x / m) (y - axis)

and

\log p (x - axis)

gives a straight line, the intercept and slope fo rthe line is

0.4771 and 2

, respectively. The mass of gas, adsorbed per gram of adsorbent if the initial pressure is

0.04 atm

is _____

\times 10^{- 4} g

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

A $100 mL$ solution was made by adding $1.43 g$ of ${Na}_{2} {CO}_{3} . {xH}_{2} O .$ The normality of the solution is $0.1 N$ . The value of $x$ is _______

(The atomic mass of $Na$ is $23 g / mol$ )

EASY

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

Which one of the following has the highest wavelength?

EASY

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

78) There are two statements, one labelled as Assertion (A) and the other as Reason (R). Examine both the statements carefully and mark the correct choice.
(A) Hydrogen has one electron in its orbit but it produces several spectral lines.
(R) There are many excited energy levels available.

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

Which of the following statements is false?

The study of emission or absorption spectra is referred to as

Important Questions on Structure of Atom

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