how many moles of HCl gas should be dissolved in 1 litre of 0.1M NH4OH solution so that it results into buffer solution having pH=9.26?(Pkb of NH4OH is = 4.74)

What is the hybridization of PH3 ? Is this possible that any compound can have a zero hybridization.

Need balanced equation for mole ratios and 1/10^9.26 = 5.50 X 10^ -10 M buffer solution.

A hint You need to show some work here as HM problem working out is forbidden on this site.