281 When an atom absorbs energy the lines in the spectrum will appear which are_________________? Chemistry Medium Full question → A Brighter B Darker C Colourless D Hard to locate
282 The maximum number of electron in a sub shell with ? = 3fs______________? Chemistry Medium Full question → A 6 B 10 C 14 D 18
283 The magnetic quantum number (QN) has its values determined directly by the value of_______________? Chemistry Medium Full question → A Principal (QN) B Azimuthal (QN) C Spin (QN) D Both A & B
284 All of the following were theorized by Bohr in his description of the atom except__________________? Chemistry Medium Full question → A Angular momentum of electrons in multiples of h/2? B Electrons revolve in discrete circular orbits C Energy of each electron is directly proportional to n2 D Electrons radiate energy continuously in a given orbit.
285 The amount of heat absorbed when one mole of a liquid is changed into gas at its boiling point is_____________________? Chemistry Medium Full question → A Molar heat of sublimation B Molar heat of fusion C Molar heat of vapourization D Latent heat of that liquid
286 If a physical and chemical change takes place at a constant pressure then the heat change during the process is called__________________? Chemistry Medium Full question → A Heat of transition B Heat of fusion C Enthalpy change D All of above
287 The number amino acid units for each turn of helix on average are____________________? Chemistry Medium Full question → A 21 B 23 C 25 D 27
288 Which solids are called true solids _______________? Chemistry Medium Full question → A Metallic B Amorphous C Crystalline D Vitreous
289 The viscosity of solids is________________? Chemistry Medium Full question → A Infinite B Negligible C Medium D No concept of viscosity in solid
290 Crystalline solids can be identified easily from their ___________________? Chemistry Medium Full question → A Sharp melting point B Definite geometry C Transition temperature D Colour
291 A malleable solid is one which can be_________________? Chemistry Medium Full question → A Converted into wires B Converted into thin sheets C Melted easily D All of the above
292 Crystallites are present in_________________? Chemistry Medium Full question → A crystalline solids B amorphous solids C liquid crystals D all of the above
293 Molar heat of vaporization of water is_________________? Chemistry Medium Full question → A 40.7 KJ/mole B 40.7 J/mole C 40.7 cal/mole D 40.7 Kcal/mole
294 Liquid gets the shape of the container when it is poured into it. Which one of the following reasons justifies it ? Chemistry Medium Full question → A Liquid do not have definite shape B Liquid do not have definite volume C Lieuid is highly compressible D Liquid molecules can slide over each other
295 The number of formula units in 29.25g of common salt_________________? Chemistry Medium Full question → A 6.022 x 1023 B 3.01 x 1023 C 2 x NA D 4 x 6.022 x 1023
296 Rising of a wetting liquid in a capillary tube is due to__________________? Chemistry Medium Full question → A Surface tension B Cohesive forces C Adhesive forces D viscosity
297 The boiling point increases down the zero group element due to_________________? Chemistry Medium Full question → A Ion dipole forces B London forces C Hydrogen bonding D Dipole dipole forces
298 When water freezes at 0°C its density decreases due to_______________? Chemistry Medium Full question → A Change of bond angles B Cubic structure of ice C Empty space present in the structure of ice D Change of bond length
299 The conversion of vapours back into their liquid state is called__________________? Chemistry Medium Full question → A crystallization B evaporization C vaporization D condensation
300 Steam causes more sever burn than the boiling water because it possesses _________________? Chemistry Medium Full question → A Latent heat of fusion B Latent heat of vaporization C Latent heat of sublimation D All of the above