AIEEE 2002 Chemistry Solved Paper

(a) AlH3+H−→AlH4−
Steric number of AlH3 is =‌

1

2

[3+3]=3
∴AlH3 is sp2 hybridized.
Steric number of AlH4−=‌

1

2

[3+4+1]=4
∴AlH4−is sp3 hybridized.
(b) H2O+H+→H3O+
Steric no of H2O=‌

1

2

(6+2)=4
∴H2‌Os‌sp‌‌3 hybridized.
Steric no of H3O+=‌

1

2

[8+3−1]=4
∴H3O+s also sp3 hybridized.
Steric no of NH3=‌

1

2

[5+3]=4
∴ hybridization of NH3 is sp3
Steric number of NH4+=‌

1

2

[5+4−]=4
∴ Hybridization of NH4‌+is sp3