The surface temperature of a white dwarf is higher than a red supergiant. True or False

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?

What produces wave a)sound b) heats c)transfer of energy d)vibrations

What is the value of the standard enthalpy of formation of an element in its most stable form?