Which of the following is incorrect about H2SO4

(A) It can act as oxidising agent with copper

(B) It acts as dehydrating agent with sugar

(C) It acts as acid in its reaction with BaO2

(D) It acts as reducing agent in its reaction with Cu2O

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group 16,preparation and properties
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Which of the following oxide is most acidic

(A) Na2O

(B) Al2O3

(C) P2O5

(D) SO3

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group 16,preparation and properties
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Which among the following is least acidic

(A) P4O6 

(B) P4O10 

(C) As4O6 

(D) As4O10 

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group 15 ,preparation and properties
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Which of the following polyhalide ion is most stable

(A) Br3- 

(B) I3- 

(C) Cl3- 

(D) F3- 

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group 17 ,preparation and properties
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A diamagnetic element burns in air to form a dioxide.This dioxide can reduce iodine to HI. When H2 gas is bubbled through this element, it forms a hydride.It was found that the reaction of the dioxide and hydride of this element produces the same metal again.The element is

(A) S

(B) Si

(C) Te

(D) PO

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group 16,preparation and properties
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Point out the incorrect statement among the following :

(A) The oxidation state of oxygen is +2 in OF2.

(B) Acidic character follows the order H2O < H2S < H2Se < H2Te.

(C) The tendency to form multiple bonds increases in moving down the group from sulphur to tellurium (towards C and N)

(D) Sulphur has a strong tendency to catenate while oxygen shows this tendency to a limited extent.

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Which of the following statements is unacceptable?

(A) Among HClO3, HClO4,HClO and HClO2, HClO3 is the weakest acid.

(B)Bromide ion can be oxidised to Br2 by chlorine.

(C) Cl2O7 is the anhydride of HClO4.

(D) Among halide ions, F- has the highest hydration energy.

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group 17 ,preparation and properties
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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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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

Concept Questions :-

group 15 ,preparation and properties
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