A mixture of three gases P (density 0.90), Q (density 0.178) and R (density 0.42) is enclosed in a vessel at constant temperature. When the equilibrium is established,
A)
The gas P will be at the top of the vessel
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B)
The gas Q will be at the top of the vessel
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C)
The gas R will be at the top of the vessel
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D)
The gases will mix homogeneously throughout the vessel.
Calculate the wavelength of the first line of \[H{{e}^{+}}\] ion spectral series whose interval with extreme lines is \[{{\frac{1}{\lambda }}_{1}}-{{\frac{1}{\lambda }}_{2}}=2.7451\times {{10}^{4}}\,\,c{{m}^{-1}}\]
\[C{{O}_{2}}\]gas along with solid (Y) is obtained when sodium salt (X) is heated. (X) is again obtained when \[C{{O}_{2}}\] gas is passed into aqueous solution of (Y). Identify (X) and (Y) respectively.
If \[{{W}_{1}},{{W}_{2}},{{W}_{3}}\] and \[{{W}_{4}}\]are work done in isothermal, adiabatic, isobaric and isochoric reversible processes, the correct order (for expansion) will be
Which of the following compounds is used in antiknock compositions to prevent the deposition of oxides of lead on spark plug, combustion chamber and exhaust pipe?
The ionization enthalpies of Li and Na are 520 kJ \[mo{{l}^{-1}}\] and 495 kJ \[mo{{l}^{-1}}\] respectively. The energy required to convert all the atoms present in 7 mg of Li vapours and 23 mg of sodium vapours to their respective gaseous captions respectively are