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highest melting point would be of1 he 2 cscl 3 nh3 4 chcl3ans
ionic compounds do not have1 hard and brittle nature2 high melting and boiling point3 directional properties4 soluble in polar solventsans
need to know common methods of preparing acetonepropanone need to include chemical equation for reaction that produces that
which of the answers listed below best completes the statement the rate at which any part of a wave travels from one place to another determines the
a satellite of mass m is in orbit around the earth if a second satellite of mass 2m is to be placed in the same orbit the second satellite must have
electrovalent compounds are1 good conductor of electricity2 polar in nature3 low mp and low bp4 easily availableans polar in
ionic bonds are usually formed by combination of elements with which type of ionisation potential or electron
a girl throws a 01 kilogram ball at a wall the ball hits the wall perpendicularly with a velocity of 5 meters per second and then bounces
the main reaction during electrovalent bond formation is1 redox reaction2 substitution reaction 3 addition reaction4 elimination reactionans redox
a car is moving along a straight horizontal road at a speed of 20 meters per second the brakes are applied and a constant force of 5000 newtons
a ball falling vertically from rest for 3 seconds travels very nearlya 147 metersb 294 metersc 441 metersd 882 metersansa ball falling vertically
out of the following which compound will have electrovalent bonding 1
alpha particles are nuclei ofa hydrogenb heliumc oxygend nitrogenansalpha particles are nuclei of
the high melting point and insolubility in organic solvents of sulphanilic acid are due to its structure1 simple
which of the following halides has maximum melting point1 nacl 2
the idea that electrons revolved in orbits around the nucleus of an atom without radiating energy away from the atom was postulated bya thompsonb
which of the following is least soluble1 bef2
among the bonds formed by a chlorine atom with atoms of hydrogen chlorine sodium and carbon the strongest bond is formed between 1 h- cl
the half-life of an isotope of an element is 5 days the mass of a 10 gram sample of this isotope remaining after 20 days isa 0312 gramsb 0625 gramsc
normal 0 false false false en-in x-none x-none
an x-ray photon collides with a free electron and the photon is scattered during this collision there is conservation of a momentum but not energyb
when a metal becomes a superconductor there is a tremendous decrease in itsa total volumeb electrical resistancec lengthd densityanswhile a metal
the millikan experiment showed that electric charge wasa negativeb quantizedc positived immeasurableans the millikan experiment showed that electric
chemical formula for calcium pyrophosphate is ca2 p2o1 the formula for ferric pyrophosphate will be1
what metals combine with non-metals the metal atom tends to1 lose electrons 2 gain electrons 3 remain electrically neutral 4 none of