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

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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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A yellow metallic powder is burnt in a stream of fluorine to obtain a colourless gas X which is thermally stable and chemically inert. Its molecule has octahedral geometry. Another colourless gas Y with same constituent atoms as that of X is obtained when sulphur dichloride is heated with sodium fluoride. Its molecule has triangular pyramidal structure X and Y are

(A) SF4 and S2F2

(B)  SF6 and  SF4 

(C) NaF and NaCl

(D)  SF4 and SF6 

Concept Questions :-

group 16,preparation and properties
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Indicate for the CIF3 molecule, the shape and the type of hybridization (of the Cl-atom)

Concept Questions :-

group 17 ,preparation and properties
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In nitrogen family the H-M-H bond angle in the hybrides MH3 gradually becomes closer to 90o on going from N to Sb. This shows that gradually

(A) The basic strength of hybrides increases

(B) Almost pure p-orbitals are used for M-H bonding

(C) The bond energies of M-H bond increases

(D) The bond pairs of electrons becomes nearer to the central atom 

Concept Questions :-

group 15 ,preparation and properties
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