P Block Elements
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New answer posted
3 months agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Correct option (i)
The compound has the following number of electrons:
NO3- = 32e-
CO32- = 32e-
ClO3- = 42e-
SO3 - = 42e-
Hence, NO3- and CO32- are isoelectronic
New answer posted
3 months agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Correct option (iii)
If an electron pair is donated to a vacant orbital on one atom and a lone pair of electrons on the other, the bonding is designated pπ-dπ depending on the orbital to which the electron pair is donated and the orbital from which the electron pair is donated.
Because their valence shells lack d-orbitals, nitrogen, carbon, and boron cannot form a pi bond. Phosphorus, on the other hand, can produce pi bonds.
New answer posted
3 months agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Correct option is (iii)
H3PO2, H3PO4, H3PO4, and other oxoacids are formed by phosphorus. P is tetrahedrally surrounded by other atoms in phosphorus oxoacids. At least one P-H bond and an O-H bond are known to form in all of them.
New answer posted
3 months agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Correct option (ii)
When H2S is passed through an aqueous solution of salt acidified with dil. HCl in qualitative analysis, a black precipitate is produced. When the precipitate is boiled with dil. HNO3, a blue solution results. When an excess of ammonia aqueous solution is added to this solution, it produces a deep blue [Cu (NH3)4]2+ solution.
New answer posted
3 months agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Correct option is (iii)
Hydrogen iodide is a more powerful reducing agent than sulphuric acid, it reduces the amount of iodine in the solution from H2SO4 to SO2 and HI to I2
When chloride salts are treated with sulfuric acid, HCl gas is formed, which produces a colourless gas.
NaCl + H2SO4→HCl + Na2SO4
Violet fumes are produced during the reaction due to the creation of iodine (I2) gas.
2NaI + H2SO4→Na2SO4 + 2HI 
2H2O + SO2 + I2
New answer posted
3 months agoContributor-Level 10
This is a short answer type question as classified in NCERT Exemplar
The following reaction with silver nitrate demonstrates phosphinic acid reducing behaviour:
4AgNO3 + 2H2O + H3PO2→4Ag + 4HNO3 + H3PO4
New answer posted
3 months agoContributor-Level 10
This is a short answer type question as classified in NCERT Exemplar
When nitric acid is mixed with copper metal, it produces distinct oxidation products.
3Cu + 8HNO3 (dil.)→3Cu (NO3)2 + 2NO + 4H2O
Cu + 4HNO3 (Conc)→3Cu (NO3)2 + 2NO2 + 2H2O
New answer posted
3 months agoContributor-Level 10
This is a short answer type question as classified in NCERT Exemplar
The crystal structure of red phosphorus features a sophisticated network of bonding, whereas white phosphorus is made up of P4 molecules. To avoid natural combustion, white phosphorus must be stored in water, but red phosphorus is stable in air.
New answer posted
3 months agoContributor-Level 10
This is a short answer type question as classified in NCERT Exemplar
On interaction with P4O10 forms an oxide of nitrogen, N2O5, and metaphosphoric acid, 3, nitric acid is formed. HPO3
HNO3 + P4O10→4HPO3 + 2N2O5
New answer posted
3 months agoContributor-Level 10
This is a short answer type question as classified in NCERT Exemplar
Three oxoacids are
(a) HNO2, Nitrous acid
(b) HNO3, Nitric acid
(c) Hyponitrous acid, H2N2O2
3HNO2
+ H2O + 2NO
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