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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The molecule having the smallest bond angle is

(A) H2O

(B) H2S

(C) H2Te

(D) H2Se

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In H3PO3

(A) Each hydrogen atom is attached to oxygen

(B) Two hydrogen atoms are attached to oxygen atoms

(C) One atom of H is attached to oxygen

(D) None is attached

Concept Questions :-

group 16,preparation and properties
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Strong oxidising agent and strong reducing agents are respectively

(A) F2, HI

(B) Cl2, HCl

(C) Br2,HBr

(D) I2, HF

Concept Questions :-

group 17 ,preparation and properties
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Oxide of a non-metal possesses the following characterstics.

(i) It is both a proton donor and proton acceptor

(ii) It is poor conductor of electricity

(iii) It reacts readily with basic and acidic oxides

(iv) It oxidises Fe at boiling point.

The oxide is

(A) H2O

(B) CO2

(C) H2O2

(D) NO

Concept Questions :-

group 16,preparation and properties
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