HCN+H2OX+NH3

XY+H2O

(Unbalanced equations)

[Y] May be prepared by which one of the following methods?

[A] By dehydration of malonic acid with P2O5

[B] By thermal decomposition of carbon sub-oxide in air.

[C] By heating potassium hyxacyaanoferrate (II) with conic H2SO4

[D] By the action of conc. HNO3 on charcoal  

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

Select the correct statement about elements of group 15th.

(A) The order of stability of oxidation state for +3 is Bi3+>Sb3+>As3+ and for +5 is Bi5+<Sb5+<As5+

(B) In the case of nitrogen, all oxidation states from +1 to +4 tend to disproportionate in acid solution.

(C) There is considerable increase in covalent radius from N to P but from As to Bi only a small increase in covalent radius is observed.

(D) All of these.

Subtopic:  Group 15 - Preparation, Properties & Uses |
 84%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

Which of the following compounds does not give nitrogen on heating?

(1) NaN3                                                     

(2) NH42SO4

(3) NH4NO2                                               

(4) NH42Cr2O7

Subtopic:  Group 15 - Preparation, Properties & Uses |
 70%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

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%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

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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NEET 2023 - Target Batch - Aryan Raj Singh