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

1. It is referred to as the anhydride of nitrous acid.
2. It is an acidic oxide. Hence, it dissolves in alkalies producing nitrites.
3. It can also be prepared by the action of 50 % HNO3 on arsenious oxide and then cooling to 250 K.
4. All of the above.

Subtopic:  Group 15 - Preparation, Properties & Uses |
 82%
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Hints

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%
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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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Hints

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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Hints

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