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Which one of the following groupings represents a collection of isoelectronic species:
(1) NA+, Ca2+, Mg2+
(2) N3, F-, Na+
(3) be, Al3+, Cl-
(4) Ca2+, Cs+,Br
Ans: N3, F-, Na+
laws of chemical combination
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Number of electrons in -CONH 2 is: (1) 22 (2) 24 (3) 20 (4)28 Ans:24
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The de-Broglie wavelength associated with a particle of mass 10 -6 kg moving with a velocity of 10 ms -1 , is: (1) 6.63 x 10 -22 m (2) 6.63 x 10 -29 m
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