Which of the following does not form pentoxide

(A) As

(B) Sb

(C) Bi

(D) P

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Which is the correct order order of decreasing boiling point of azeotropic mixtures HX-H2O

(A) HI,HBr,HF,HCl

(B) HI,HCl,HBr,HF

(C) HF,HCl,HBr,HI

(D) HCl,HF,HBr,HI

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F2 reacts with dilute NaOH to give oxygen difluroide of the formula

(A) F2O

(B) OF2

(C) F2O2

(D) F2O3

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Which of the following oxyacids of chlorine is least oxidising in nature

(A) HOCl

(B) HClO2

(C) HClO3

(D) HClO4

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Which of the following is most basic

(A) F-

(B) Cl-

(C) Br-

(D) I-

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Of the hybrides,H2O,H2S,H2Se and H2Te, the one which has the smallest pKa value is

(A) H2O

(B) H2S

(C) H2Se

(D) H2Te

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The shape of ClO3- is

(A) Tetrahedral

(B) Triangular planer

(C) Triangular pyramid

(D) Planer

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Which reaction can not be used for the preparation of halogen acid

(A) 2KBr +H2SO4(conc.) K2SO4 +2HBr(B) NaCl +H2SO4(conc.) NaHSO4 +HCl(C) NaHSO4 +NaCl Na2SO4 +HCl(D) CaF2 +H2SO4(conc.) CaSO4 +2HF

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An element (X) forms compounds of the formula XCl3, X2O5 and Ca3X2,but does not form XCl5. Which of the following is the element

(A) B

(B) Al

(C) N

(D) P

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Oxygen does not form OF6 because

(A) It has a small size

(B) There are no vacant d- orbitals available

(C) It has high ionisation energy

(D) It has large size

Concept Questions :-

group 16,preparation and properties
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