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from the following which group of elements easily forms cation1 f cl br
formula of a metallic oxide is mothe formula of its phosphate will be1 m2po42
in the following which substance will have highest boiling point1 he 2
electrovalent bond formation depends on1 ionization energy2 electron affinity3 lattice energy4 all the three aboveans all the three
a electrovalent compound is made up of1 electrically charged molecules2 neutral molecules3 neutral atoms4 electrically charged atoms or group of
electrovalent compounds1 melting points are low2 boiling points are low3 conduct current in fused stat4 insoluble in polar solventans conduct
the electronic configuration of four elements lq p and r are given in bracketsl 1s2 2s2 2p4 q 1s2 2s2 2p6 3s2 3p5p 1s2
which one is least ionic in the following compounds1 agcl2 kcl 3 bacl2
when sodium and chlorine reacts then1 energy is released and ionic bond is formed2 energy is released and a covalent bond is formed3 energy is
which forms a crystal of nacl1 nacl molecules2 na and cl - ions3 na andcl atoms4 none of the aboveans na and cl -
as electron moves away from the nucleus its potential energy1 increases2 decreases3 remains constant4 none of theseans
the value of plancks constant is 663x 10-34js the velocity of light is 30x 108ms-1 which value is closest to the wavelength in
in bohr series of lines of hydrogen spectrum the third line from the red end corresponds to which one of the following inter-orbit jumps of the
which of the following electron transition in a hydrogen atom will require the largest amount of1 from n-1 to n2 2
the frequency of one of the lines in paschen series of hydrogen atom is2340x1011hz the quantum number n2 which produces this transition is1
which of the following has maximum number of unpaired electron atomic number of fe 261 fe 2 fe
the third line in balmer series corresponds to an electronic transition between which bohrs orbits in hydrogen1 5 rarr
the number of nodal planes in a px is1 one 2 two 3
the energy required to dislodge electron from excited isolated h-atom ie1 136 ev is1 136ev
the ionization energy of hydrogen atom is -136ev the energy required to excite the electron in a hydrogen atom from the ground state to the first
the series limit for balmer series of h-spectra is1 3800 2 4200 3
the frequency of a wave of light is 12x 10 14s-1 the wave number associated with this light is 1 5x10-7m
the bohr orbit radius for the hydrogen atom n1 is approximately 0530aring the radius for the first excited state n2 orbit is1
the total number of valence electrons in 42 gm n-3 of ion is na is the avogadros number1
the energy of the electron in the first orbit of he is -8716x 10 -20j the energy of the electron in the first orbit of hydrogen would