The RMS velocity of CO gas molecules at 27°C is approximately

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The atomic number of cerium (Ce) is 58. The correct electronic configuration of Ce3+ ion is.

  • [Xe] 4f1

  • [Kr] 4f1

  • [Xe] 4f13

  • [Kr] 4d1


2.

The number of lone pairs of electrons on the central atoms of H2O, SnCl2, PCl3 an XeF2 respectively are

  • 2, 1, 1, 3

  • 2, 2, 1, 3

  • 3, 1, 1, 2

  • 2, 1, 2, 3


3.

Consider the following salts : NaCl, HgCl2, Hg2Cl2, CuCl2, CuCl and AgCl. Identify the correct set of insoluble salts in water.

  • Hg2Cl2, CuCl, AgCl

  • Hg2Cl, CuCl, AgCl

  • Hg2Cl2, CuCl2, AgCl

  • Hg2Cl2, CuCl, NaCl


4.

At a certain temperature, the value of the slope of the plot of osmotic pressure (π) against concentration (C in molL-1) of a certain polymer solution is 291R. The temperature at which osmotic pressure is measured, is (R is gas constant) 

  • 271°C

  • 18°C

  • 564 K

  • 18 K


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5.

The RMS velocity of CO gas molecules at 27°C is approximately 1000 m/s. For N2 molecules at 600 K, the RMS velocity is approximately

  • 2000 m/s

  • 1414 m/s

  • 1000 m/s

  • 1500 m/s


B.

1414 m/s

Given - (vrms)co = 1000 m/s

(Temp)co = 27°C

(Temp)N2 = 600 K

As the formula =vrms3RTM

By putting the values, we get

vrmscocrmsN2    = 3R3R × TCOMCO × MN2TN2 1000vrms        = 30028 × 28600 = 12or, (vrms)N2 = 1000 × 1.414                  = 1414 m/s


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6.

A gas can be liquefied at temperature T and pressure p provided

  • T = Tc and p < pc

  • T < Tc and p > pc

  • T > Tc and p > pc

  • T > Tc and p < pc


7.

The dispersed phase and dispersion medium of fog respectively are

  • solid, liquid

  • liquid, liquid

  • liquid, gas

  • gas, liquid


8.

The decreasing order of basic character of K2O, BaO, CaO and MgO is

  • K2O > BaO > CaO > MgO

  • K2O > CaO > BaO > MgO

  • MgO > BaO > CaO > K2O

  • MgO > CaO > BaO > K2O


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9.

Cold ferrous sulphate solution on absorption of NO develops brown colour due to the formation of

  • paramagnetic [Fe(H2O)5(NO)] SO4

  • diamagnetic [Fe(H2O)5(N3)] SO4

  • paramagnetic [Fe(H2O)5(NO3)][SO4]2

  • diamagnetic [Fe(H2O)4 (SO4)]NO3


10.

For the reaction,
2SO2 (g) + O2 (g) 2SO3 (g) at 300 K, the value of G° is -690.9 R. The equilibrium constant value for the reaction at that temperature is (R is gas constant)

  • 10 atm-1

  • 10 atm

  • 10

  • 1


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