What is electrovalency of Al,Ca,P and He respectively according to lewis symbolsa) 3, 1, 2, 0 b) 2, 3, 1, 0

c) 1, 2, 3, 0 d) 3, 2, 3, 0​

Total number of structural isomers of 
[Co(NH₃)₆][Cr(CN)₆]

Why is boiling point of Cesium higher than that of Rubidium

 

which isomer mentioned in (a) is water soluble and why?

A gaseous mixture contains CO2 and CO the mass of the mixture is 200g and they are presenting equal fraction of moles . Find the total no. of O-atoms present in the mixture.