A brown coloured mixture of two gases is obtained by the reduction of 6N nitric acid with metallic
copper. This mixture on cooling condenses to a blue liquid which on freezing (-30o C) gives a blue solid.
The correct choice for blue liquid or solid is.

(A) It is referred to as the anhydride of nitrous acid.
(B) It is an acidic oxide and hence dissolves in alkalies producing nitrites.
(C) It can also be prepared by the action of 50% HNO3 on arsenious oxide and then cooling to 250K.
(D) All of these.

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Select the incorrect statement

(A) Nitrous oxide supports combustion more vigorously than air.

(B) Phosphorous pentaoxide dehydrates nitric acid forming nitrogen pentaoxide.

(C) Reactivity order of various allotropic forms of phosphorous is white > red > black.

(D) Red phosphorous changes to white phosphorus on heating in the atmosphere of CO2  or coal gas at 573 K.

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Phosphate rock (fluorapatite) on reaction with orthophosphoric acid produces:

1. CaH2PO42+CaF2                   

2. Ca3PO42+CaF2+H2O

3. CaH2PO42+HF                       

4. Ca3PO42+HF+H2O

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NH4ClO4+HNO3diluteHClO4+X

XYg

X and Y are respectively.

(a) NH4NO3 and N2O       (c) NH4NO2 and N2

(b) HNO4 and O2                (d) None

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One of the products of the following reaction KCNO+NH4SO4 is :

(A) NH4NO2                              (B) NH4NO3

(C) NH2-CO-NH2                  (D) N2 and NO2 both

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Which of the following orders is correct?

(1) SbH3>NH3>AsH3>PH3 – Boiling Point

(2) NH3>PH3>AsH3>SbH3  – Thermal Stability

(3) NH3>PH3>AsH3>SbH3  – Basic Character

(4) NH3>PH3>AsH3>SbH3  – Bond Angle

(A) (1), (2) and (3) only                             (B) (2), (3) and (4) only

(C) (1), (3) and (4) only                             (D) (1), (2), (3) and (4).

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Which of the following is correct?

(A) S3O9  – contains no S - S linkage.

(B) S2O62-   – contains – O - O linkage.

(C) HPO33  – contains P – P linkage.

(D) S2O82- - contains S – S linkage.

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group 16,preparation and properties
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The oxidation states of S atom in S4O62-  from left to right respectively are:

(A) + 6, 0, 0, +6                          (B) +5, +1, +1, +5

(C) +5, 0, 0, +5                           (D) +3, +1, +1, +3

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One gas bleaches the coloured matter by reduction temporary while the other one by oxidation
permanently. The gases are respectively:

(A) SO2 and Cl2                               (B) O3 and Cl2

(C) H2S and CO2                             (D) Cl2 and SO2

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H2SO4  cannot be used to prepare HI from KI as:

(A) Its reaction with KI is very slow.                   (B) It oxidizes HI to iodine.
(C) It disproportionates HI.                                (D) It reduces HI.

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