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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The strongest acid is

(A) H3PO2 

(B) H3PO3 

(C) H4P2O7 

(D) H3PO4 

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Which of the following HY(hydra-acid of halogen) is the strongest acid, best reducing agent, is the least stable and is easily oxidised

(A) HF

(B) HCl

(C) HBr

(D) HI

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Strength of halogen acids, HF,HCl,HBr and HI varies in the order

(A) HF>HCl>HBr>HI

(B)HF>HBr>HI>HCl

(C) HBr>HI>HCl>HF

(D) HI>HBr>HCl>HF

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Flourine does not form oxyacids because

(A) It is most electronegative

(B) It is the most powerful oxidising agent

(C) It has vacant d- orbitals

(D) None of these

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Which is correct order of basic strength

(A) OCl->ClO2->ClO3->ClO4-

(B) ClO4->ClO3->ClO2->ClO-

(C) ClO3->ClO4->ClO2->ClO-

(D) None of these

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