GATE CY 2018 Question Paper (04-Feb-2018) (Shift 2)

Two moles of an ideal gas X and two moles of an ideal gas Y, initially at the same temperature and pressure, are mixed under isothermal-isobaric condition. The entropy change on mixing is______________________$J{K}^{-1}$. (Up to one decimal place. Use $R=8.31J{K}^{-1}mo{l}^{-1}$)

The energy of a hydrogen molecule in its ground state equilibrium configuration is $-31.7eV$.Its dissociation energy is_______________$eV$. (Up to one decimal place)

The total number of valence electrons in $W({\eta }^3-Cp)({\eta }^5-Cp)(CO{)}_2$ is ______________.(Atomic number of W = 74)

In the ${}^{1}HNMR$ spectrum of an organic compound recorded on a 300 MHz instrument, a proton resonates as a quartet at $\delta 4.20ppm$. The individual signals of the quartet appear at $\delta 4.17,4.19,4.21and4.23ppm$. The coupling constant J in Hz is ____________.

In the electron ionization (EI) mass spectra, methyl hexanoate, methyl heptanoate and methyl octanoate give the same base peak. The m/z value of the base peak is ____________.