Which of the following statements is false?  

1. Nitrous oxide supports combustion more vigorously than air.
2. Phosphorous pentaoxide dehydrates nitric acid-forming nitrogen pentaoxide.
3. Reactivity order of various allotropic forms of phosphorous is white > red > black.
4. Red phosphorous changes to white phosphorus on heating in the atmosphere of  CO 2   or coal gas at 573 K.

Subtopic:  Group 15 - Preparation, Properties & Uses |
 65%
From NCERT
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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

Subtopic:  Group 15 - Preparation, Properties & Uses |
 65%
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Hints

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

(A) NH4NO2                              (B) NH4NO3

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

Subtopic:  Group 15 - Preparation, Properties & Uses |
 56%
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Hints

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).

Subtopic:  Group 15 - Preparation, Properties & Uses |
 51%
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Hints

Which of the following is correct?

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

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

(3) HPO33  – contains P – P linkage.

(4) S2O82- - contains S – S linkage.

Subtopic:  Group 16 - Preparation, Properties & Uses |
 53%
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The oxidation states of the S atom in S4O62-  from left to right, respectively, are:

1. + 6, 0, 0, and +6                         

2. +5, +1, +1, and +5

3. +5, 0, 0, and +5                           

4. +3, +1, +1, and +3

Subtopic:  Group 16 - Preparation, Properties & Uses |
 66%
From NCERT
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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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Hints

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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To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh