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

(1) SO2 and Cl2                              

(2) O3 and Cl2

(3) H2S and CO2                             

(4) Cl2 and SO2

Subtopic:  Group 16 - Preparation, Properties & Uses |
 75%
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H2SO4  cannot be used to prepare HI from KI as:

(1) Its reaction with KI is very slow.                   

(2) It oxidizes HI to iodine.

(3) It disproportionates HI.                               

(4) It reduces HI.

Subtopic:  Group 17 - Preparation, Properties & Uses |
 75%
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Which of the following statements is false? 

1. H3PO2, H3PO3 and H3PO4 all are tribasic and reducing in nature.
2. Amongst anions \(NO_{3}^{-}\)\(SO_{3}^{2-}\)\(CO_{3}^{2-}\), and \(BO_{3}^{3-}\), only \(SO_{3}^{2-}\) have  pπ-dπ bonding .
3. Amongst anions \(SO_{3}^{2-}\), \(SO_{4}^{2-}\)\(S_{2}O_{4}^{2-}\) and \(HSO_{4}^{-}\), \(SO_{3}^{2-}\) is basic and reducing in nature.
4. Number of lone pair(s) of electrons on Xe atoms in XeF2, XeFand XeF6 are 3, 2 and 1 respectively._

Subtopic:  Group 18 - Preparation, Properties & Uses | Group 16 - Preparation, Properties & Uses | Group 15 - Preparation, Properties & Uses |
 78%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

The incorrect statement among the following regarding helium is -


1. It is used to produce and sustain powerful superconducting magnets.

2. It is used as a cryogenic agent for carrying out experiments at low temperatures.

3. It is used in filling balloons for meteorological observations because it is lighter and non-inflammable.

4. It is used as a dilute for oxygen in modern diving apparatus because of its high solubility in blood.

Subtopic:  Group 18 - Preparation, Properties & Uses |
 59%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

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
Subtopic:  Group 15 - Preparation, Properties & Uses |
From NCERT
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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
Subtopic:  Group 15 - Preparation, Properties & Uses |
 69%
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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
Subtopic:  Group 15 - Preparation, Properties & Uses |
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

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
Subtopic:  Group 15 - Preparation, Properties & Uses |
 63%
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Assertion : Sulphur dioxide is more powerful reducing agent in alkaline medium than in acidic
medium.

Reason :  Sulphur dioxide reacts with hydrogen sulphide in presence of moisture and sulphur is
precipitated.

  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
Subtopic:  Group 16 - Preparation, Properties & Uses |
From NCERT
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Assertion : SF6 is used as a gaseous insulator in high voltage generators.

Reason :  It is inert and has good dielectric properties.

  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
Subtopic:  Group 16 - Preparation, Properties & Uses |
 80%
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