What is the ionic charge for the cobalt ion in CO2(SO3)3? 2+ 1+ zero 3- none of

Question

What is the ionic charge for the cobalt ion in CO2(SO3)3? 2+ 1+ zero 3- none of the above Which of the following anions is isoelectronic with krypton? chloride ion phosphide ion sulfide ion all the above none of the above What is the vapor pressure of water at 100 C? 1 mm Hg 100 mm Mg 76 mm Mg 760 mm Mg none of the above What is the total number of valence electrons in an azide ion, N_3^-? 14 22 16 15 none of the above Which of the following is a semimetal? Na K greaterthanequalto Cr none of the above

Explanation / Answer

soln

21) e) non of these above .... cobalt is in +3 charge

22) e) non of these above   Br- is isoelectronic with krypton. Bromide 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6  

23) d) 760 mmHg

24) C) 16 ....

There are three nitrogens, and so 5×3=155×3=15 electrons forN3 Finally, azide is N3, there is an additional electron beyond the neutral form. So, the total number of vale nce electrons is 15+1=16.

25) c) Ge ....Semi-metals are located along the line between the metals and non-metals in the periodic table.

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