3. Classification of elements and periodicity in properties — Chemistry STD 11 Science — Question

$\text { Given : pKa }\left( CH _3 COOH \right)=4.76$

$\log 2=0.30$

$\log 3=0.48$

$2NH_3 + 5F_2\,\,\to \,\, N_2F_4 + 6HF$

$MgO + 2HCl \longrightarrow MgCl_2 + H_2O$

$(a)$ $PCl_5$ form weak monobasic acid during hydrolysis
$(b)$ In $B_3N_3H_6$ nucleophile attack on $B-$ atom
$(c)$ $Al_2Cl_6$ is a polar and planar molecule
$(d)$ In $AlF_3$, hybridisation of $Al$ is $sp^2$