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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group 15 ,preparation and properties
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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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group 15 ,preparation and properties
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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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group 17 ,preparation and properties
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Which of the following statements is false?

(A) H3PO2, H3PO3 and H3PO4  all are tribasic and reducing in nature.

(B) Amongst anions NO3-, SO32-, CO32- and BO33- only SO32-  have pπ-π d bonding.

(C)  Amongst anions  SO32-, SO42-, S2O42- and HSO4-, SO32- is basic and reducing in nature.

(D) Number of lone pair(s) of electrons on X3 atoms in XeF2, XeF4 and XeF6 are 3, 2 and 1 respectively.

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Oxyacids of Phosphorus/Nitrogen
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Which one of the following statements regarding helium is incorrect?
(A) It is used to produce and sustain powerful superconducting magnets.
(B) It is used as a cryogenic agent for carrying out experiments at low temperatures.
(C) It is used in filling balloons for meterological observations because it is lighter and non-inflammable.
(D) It is used as dilute for oxygen in modern diving apparatus because of its high solubility in blood.

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group 18,perparation and properties
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Assertion : PbI4  is not known probably because of the oxidising power of Pb(IV) and reducing
power of I-.

Reason :  Iodide stabilizes higher oxidation state.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

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group 15 ,preparation and properties
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Assertion : P4O10 is not used to dry NH3.

Reason : P4O10 is acidic and NH3 is basic.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

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