Use the chart to determine which pair of atoms has the greatest polarity

C

Explanation:

The pair with the greatest polarity is the one with the greatest net difference in electronegativity. We do this by taking the absolute value of the electronegativity of the first atom minus the electronegativity of the second atom.

Al-Si= abs(1.61-1.9)= abs(-0.29)= 0.29

S-Cl= abs(2.58-3.16)= abs(-0.58)= 0.58

N-H= abs(3.04-2.2)= abs(0.84)=0.84

C-N= abs(2.55-3.04)= abs(-0.49)=0.49

The pair with the greatest difference in electronegativity is N-H