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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group 15 ,preparation and properties
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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

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group 15 ,preparation and properties
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Which of the following statements are not true for phosphorus

(A) It is non-metal

(B) It exists as a tetrahedral molecular solid

(C) It is less reactive than nitrogen

(D) P-P bond is much wealker than NN bond

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group 15 ,preparation and properties
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Dipole moment is highest for

(A) NCl3

(B) NBr3

(C) NI3

(D) NF3

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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

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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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