IIT-JEE Exam

A gaseous hydrocarbon gives upon combustion
0.72 g. of water and 3.08 g. of CO2. The empirical
formula of the hydrocarbon is -

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IIT-JEE Other Question

Which of the following represents the correct order
of increasing first ionization enthalpy for Ca, Ba, S,
Se and Ar ?
(1) Ba < Ca < Se < S < Ar
(2) Ca < Ba < S < Se < Ar
(3) Ca < S < Ba < Se < Ar
(4) S < Se < Ca < Ba < Ar The rate of a reaction doubles when its temperature
changes from 300 K to 310 K. Activation energy of
such a reaction will be : (R = 8.314 JK–1 mol–1 and
log 2 = 0.301)
(1) 58.5 kJ mol–1 (2) 60.5 kJ mol–1
(3) 53.6 kJ mol–1 (4) 48.5 kJ mol–1