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

Concept Questions :-

group 16,preparation and properties
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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

Concept Questions :-

group 16,preparation and properties
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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.

Concept Questions :-

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.

Concept Questions :-

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.

Concept Questions :-

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

Concept Questions :-

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

Concept Questions :-

group 15 ,preparation and properties
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Assertion : HNO3  is stronger acid than HNO2.

Reason : In HNO3 there are two nitrogen to oxygen bonds where as in HNO2 there is only one.

  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

Concept Questions :-

group 15 ,preparation and properties
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Assertion : HNO3 oxides sulphur to H2SO4  acid ( S + VI) but only oxidizes selenium to H2SeO3 ( Se + IV ).

Reason : In Selenium atoms, the electrons are more tightly held by the nucleus on account of increased nuclear charge.

  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

Concept Questions :-

group 15 ,preparation and properties
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