Moist ammonia gas is dried over

(A) P2O5

(B) Anhydrous CaCl2

(C)Quick lime

(D)Conc. H2SO4

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group 15 ,preparation and properties
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The correct order for the increasing acidic strength of oxidies of nitrogen is

(A)N2O <NO<N2O4<N2O3<N2O5

(B)N2O <NO<N2O3<N2O4<N2O5

(C)N2O <N2O3<N2O4<N2O5<NO

(D)NO<N2O <N2O3<N2O4<N2O5

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group 15 ,preparation and properties
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In the compounds of the type POX3, the P atom multiple bond is of the type

(A) pπ-

(B) dπ-

(C) pπ-

(D) None of these

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group 15 ,preparation and properties
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Which of the following statements are not true for phosphorus

(A) It is non-metal

(B) It exists as a tetrahedral molecular solid

(C) It is less reactive than nitrogen

(D) P-P bond is much wealker than NN bond

Concept Questions :-

group 15 ,preparation and properties
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Dipole moment is highest for

(A) NCl3

(B) NBr3

(C) NI3

(D) NF3

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group 15 ,preparation and properties
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The basicity of the acids H3PO2, H3PO3, H3PO and H4P2O7 are respectively

(A) 1,2,3,7

(B) 2,3,4,7

(C) 1,2,3,4

(D) 1,2,3,5

Concept Questions :-

group 15 ,preparation and properties
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When 80 ml of ozonised oxygen was heated until no further change was observed and then cooled to have the same initial temperature and pressure, the volume measured was 95 ml. What would be the voume, if 40 ml of the mixture of O2 and O3 was exposed to oil of turpentine?

(A) 15 ml

(B) 25 ml

(C) 20 ml

(D) 30 ml

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group 16,preparation and properties
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The correct order of decreasing Lewis acid strength of trichlorides of group 15 elements is

(A) AsCl3>PCl3>BiCl3>SbCl3(B)PCl3>AsCl3>SbCl3>BiCl3(C) NCl3>PCl3>AsCl3>SbCl3(D)SbCl3>BiCl3>PCl3>AsCl3

Concept Questions :-

group 15 ,preparation and properties
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Which of the following flourides has the least capacity as fluoride ion acceptor

(A)AsF5

(B) SbF5

(C) PF5

(D) None of these

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The ionic character of H-X is highest in

(A) HBr

(B) HI

(C) HF

(D)HCl

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