Chemistry

NEET Class 12

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1.

The emission spectrum of hydrogen discovered first and the region of the electromagnetic spectrum in which it belongs, respectively are

Lyman, ultraviolet

Lyman, visible

Balmer, ultraviolet

Balmer, visible

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As per de-Broglie's formula a macroscopic particle of mass 100 g and moving at a velocity of 100 cm s^{-1} will have a wavelength of

6.6 × 10

^{-29}cm6.6 × 10

^{-30}cm6.6 × 10

^{-31}cm6.6 × 10

^{-32}cm

C.

6.6 × 10^{-31} cm

According to de-Broglie wavelength, λ = $\frac{\mathrm{h}}{\mathrm{mv}}$

Given, m = 100 gm; v = 100 cm s^{-1}

h = 6.6 × 10^{-34} J-s = 6.6 × 10^{-27} erg-s

On substituting values, we get

λ = $\frac{6.6\times {10}^{-27}}{100\times 100}=6.6\times {10}^{-31}$

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3.

For one mole of an ideal gas,the slope of V *vs* T curve at constant pressure of 2 atm is X L mol^{-1} K^{-1}.The value of the ideal universal gas constant 'R' in terms of X is

X L atm mol

^{-1}K^{-1}$\frac{\mathrm{X}}{2}$L atm mol

^{-1}K^{-1}2X L atm mol

^{-1}K^{-1}2 X atm L

^{-1}mol^{-1}K^{-1}

4.

At a certain temperature the time required for the complete diffusion of 200-mL of H_{2} gas is 30 min. The time required for the complete diffusion of 50 mL of O_{2} gas at the same temperature will be

60 min

30 min

45 min

15 min

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5.

The correct order of decreasing H-C-H angle in the following molecule is

I > II > III

II > I > III

III > II > I

I > III > II

6.

During the emission of a positron from a nucleus, the mass number of the daughter element remains the same but the atomic number

is decreased by 1 unit

is decreased by 2 units·

is increased by 1 unit

remains unchanged

7.

β- emission is always accompained by

formation of antineutrino and α-particle

emission of α-particle and γ-ray

formation of antineutrino and γ-ray

formation of antineutrino and positron

8.

Four gases P, Q, R and S have almost same values of 'b' but their 'a' values (a, b are van der Waals' constants) are in the order Q < R < S < P. At a particular temperature, among the four gases, the most easily liquefiable one is

P

Q

R

S

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10.

The correct order of decreasing length of the bond as indicated by the arrow in the following structures is

I > II > III

II > I > III

III > II > I

I > III > II

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