AIEEE 2004 Paper With Solution

AIEEE 2004

Sample Questions

Consider the ground state of Cr atom (Z = 24). The number of electrons with the azimuthal quantum numbers I =1 and 2 are respectively

12 and 4 (2) 16 and 5

16 and 4 (4) 12 and 5

Ans. 12 and 5

Which one the following ions has the highest value of ionic radius?

Li+ (2) F^–

(3) O^2- (4) B³+

Ans. O^2-

The wavelength of the radiation emitted, when in hydrogen atom electron falls from infinity to stationary state 1, would be (Rydberg constant = 1.097×10⁷ m^-1)

(1) 91 nm (2) 9.1×10^-8 nm

(3) 406 nm (4) 192 nm

Ans. 91 nm

The correct order of bond angles (smallest first) in H2S, NH3, BF3 and SiH4 is

(1) H2S < SiH4 < NH3 < BF3 (2) H2S < NH3 < BF3 < SiH4

(3) H2S < NH3 < SiH4 < BF3 (4) NH3 < H2S < SiH4 < BF3

Ans. H2S < NH3 < SiH4 < BF3

Which one the following sets of ions represents the collection of isoelectronic species?

(1) K+, Ca²+, Sc³+, Cl^– (2) Na+, Mg²+, Al³+, Cl^–

(3) K+, Cl^–, Mg²+, Sc³+ (4) Na+, Ca²+, Sc³+, Ans. K+, Ca²+, Sc³+, Cl^–

Among Al₂O₃, SiO₂, P₂O₃ and SO₂ the correct order of acid strength is

(1) SO2 < P2O3 < SiO2 < Al2O3 (2) Al2O3 < SiO2 < P2O3 < SO2

(3) Al₂O₃ < SiO₂ < SO₂ < P₂O₃ (4) SiO₂ < SO₂ < Al₂O₃ < P₂O₃

Ans. Al2O3 < SiO2 < P2O3 < SO2

The bond order in NO is 2.5 while that in NO+ is 3. Which of the following statements is true for these two species?

Bond length in NO+ is greater than in NO

Bond length is unpredictable

Bond length in NO⁺ in equal to that in NO

Bond length in NO is greater than in NO⁺

Ans. Bond length in NO is greater than in NO+

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