At identical temperature and pessure, the ratio of diffusion of h

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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1.

At identical temperature and pessure, the ratio of diffusion of hydrogen gas is 33 times that of a hydrocarbon having molecular formula CnH2n-2. What is the value of 'n'?

  • 1

  • 4

  • 3

  • 8


B.

4

rH2rCnH2n-2 = MCnH2n-2MH2 = MCnH2n-22 MCnH2n-22 = 33 = 27MCnH2n-2 = 27 × 2 = 54

Hence, 12n + (2n - 2) × 1 = 54 

14n = 56

n = 4

Thus, hydrocarbon is C4H6.


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2.

Dipole moment of  is 1.5 D. The dipole moment of  is

  • 1.5 D

  • 2.25 D

  • 1 D

  • 3 D


3.

Which of the following thermodynamic relation is correct ?

  • dG = Vdp- SdT

  • dE = pdV + TdS

  • dH = -Vdp + Tds

  • dG = Vdp + SdT


4.

Calculate Kc for the reversible process given below if Kp = 167 and T = 800°C

CaCO3 (s)  CaO (s) + CO2 (g)

  • 1.95

  • 1.85

  • 1.89

  • 1.60


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5.

For a reversible chemical reaction where the forward process is exothermic, which of the following statements is correct ?

  • The backward reaction has higher activation energy than the forward reaction.

  • The backward and the forward processes have the same activation energy.

  • The backward reaction has lower activation energy

  • No activation energy is required at all since energy is liberated in the process.


6.

In Sommerfeld's modification of Bohr's theory, the trajectory of an electron in a hydrogen atom is

  • a perfect ellipse

  • a closed ellipse-like curve, narrower at the perihelion position and flatter at the aphelion position

  • a closed loop on spherical surface

  • a rosette


7.

In the reaction of sodium thiosulphate with I2 in aqueous medium, the equivalent weight of sodium thiosulphate is equal to

  • molar mass of sodium thiosulphate

  • the average of molar masses of Na2S2O3 and I2

  • half the molar mass of sodium thiosulphate

  • molar mass of sodium thiosulphate × 2


8.

0.1M HCl and 0.1M H2SO4 each of volume 2 mL are mixed and the volume is made upto 6 mL by adding 2 mL of 0.01N NaCl solution. The pH of the resulting mixture is

  • 1.17

  • 1.0

  • 0.3

  • log 2 - log 3


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9.

The molarity of a NaOH solution by dissolving 4 g of it in 250 mL water is

  • 0.4 M

  • 0.8 M

  • 0.2 M

  • 0.1 M


10.

If a species has 16 protons, 18 electrons and 16 neutrons, find the species and its charge.

  • S1-

  • Si2-

  • P3-

  • S2-


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