95 Important Reactions of P-block elements for Class 12

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In this post, you will find the important reactions of p-block elements for class 12. The p-block elements, also known as the main group elements, are located in groups 13 to 18 of the periodic table. These elements play a crucial role in various chemical reactions and display diverse properties due to their electron configurations. One of the important reactions of p-block elements is their ability to form covalent and ionic bonds. For example, elements in group 14, such as carbon and silicon, have the ability to form covalent bonds with other elements. This property allows them to participate in organic chemistry, where they form the backbone of many organic compounds.

Another significant reaction of p-block elements is their tendency to gain or lose electrons to achieve a stable electron configuration. This is particularly observed in the elements of group 17, known as the halogens. These elements, such as fluorine, chlorine, and bromine, readily gain an electron to achieve a stable noble gas configuration. This property makes them highly reactive and useful in various applications, such as in disinfectants and as catalysts.

Furthermore, p-block elements exhibit interesting trends in their chemical and physical properties across the periodic table. As we move down a group, the metallic character of the elements increases. For example, group 13 elements like boron and aluminium show more metallic properties compared to group 14 elements such as carbon and silicon. This variation in properties provides a clear correlation with the atomic structure and helps us understand the behaviour of these elements in different chemical reactions. Overall, studying the reactions of p-block elements is crucial in understanding the fundamental principles of chemistry.

By exploring their covalent and ionic bonding capabilities, electron configuration tendencies, and trends in properties, we can gain valuable insights into the vast realm of chemistry. This knowledge is essential for class 12 students as they delve deeper into the fascinating world of p-block elements.

Important Reactions of P-block elements for Class 12

Note: No reaction will be asked except these 95 reactions in exam.

Conceptual Questions of P-block elements

Reactions are as:

SNoReactions
1.3 HNO2 → HNO3 + H2O + 2 NO
2.NH4Cl + NaNO2 → N2 + 2 H2O + NaCl
3.(NH4)2Cr2O7 → N2 + 4H2O + Cr2O3
4.Ba(N3)2 → Ba + 3 N2
5.Li + N2 → Li3N
6.Mg + N2 → Mg3N2
7.N2 + O2 ⇌ 2 NO
8.N2 + 3 H2 ⇌ 2 NH3
9.NaN3 → Na + 3 N2
10.NH2CONH2 + 2 H2O → (NH4)2CO3
11.(NH4)2CO3 → 2 NH3 + H2O + CO2
12.NH4Cl + Ca(OH)2 → 2 NH3 + 2 H2O + CaCl2
13.(NH4)2SO4 + 2 NaOH → 2 NH3 + 2 H2O + Na2SO4
14.ZnSO4 + 2 NH4OH → Zn(OH)2 + (NH4)2SO4
15.FeCl3 + NH4OH → Fe2O3.xH2O (brown ppt.) + NH4Cl
16.Cu2+ + 4 NH3 → [Cu(NH3)4]2+ (deep blue colouration)
17.AgCl + 2 NH3 → [Ag(NH3)2]Cl
18.NaNO3 + H2SO4 → NaHSO4 + HNO3
19.4 NH3 + 5 O2 → 4 NO + 6 H2O
20.3 NO2 + H2O → 2 HNO3 + NO
21.3 Cu + 8 HNO3 (dil.) → 3 Cu(NO3)2 + 2 NO + 4 H2O
22.Cu + 4 HNO3 (conc.) → Cu(NO3)2 + 2 NO2 + 2 H2O
23.4 Zn + 10 HNO3 (dil.) → 4 Zn(NO3)2 + 5 H2O + N2O
24.Zn + 4 HNO3 (conc.) → Zn(NO3)2 + 2 H2O + 2 NO2
25.I2 + 10 HNO3 → 2 HIO3 + 10 NO2 + 4 H2O
26.C + HNO3 → CO2 + 2 H2O + 4 NO2
27.S8 + 48 HNO3 → 8 H2SO4 + 48 NO2 + 16 H2O
28.P4 + 20 HNO3 → 4 H3PO4 + 20 NO2 + 4 H2O
29.P4 + 3 NaOH + 3 H2O → PH3 + 3 NaH2PO2
30.P4 + 5 O2 → P4O10
31.Ca3P2 + 6 H2O → 3 Ca(OH)2 + 2 PH3
32.Ca3P2 + 6 HCl → 3 CaCl2 + 2 PH3
33.PH4I + KOH → KI + H2O + PH3
34.3 CuSO4 + 2 PH3 → Cu3P2 + 3 H2SO4
35.3 HgCl2 + 2 PH3 → Hg3P2 + 6 HCl
36.PH3 + HI → PH4I
37.P4 + SOCl2 → PCl3 + SO2 + S2Cl2
38.PCl3 + 3 H2O → H3PO3 + 3 HCl
39.P4 + 10 SO2Cl2 → 4 PCl5 + 10 SO2
40.PCl5 + H2O → POCl3 + 2 HCl
41.POCl3 + 3 H2O → H3PO4 + 3 HCl
42.PCl5 → PCl3 + Cl2
43.2 Ag + PCl5 → 2 AgCl + PCl3
44.Sn + 2 PCl5 → SnCl4 + 2 PCl3
45.PCl3 + 3 H2O → H3PO3 + 3 HCl
46.4 H3PO3 → 3 H3PO4 + PH3
47.4 AgNO3 + 2 H2O + H3PO2 → 4 Ag + 4 HNO3 + H3PO4
48.2 KClO3 → 2KCl + O2 (MnO2 used as a catalyst)
49.2 H2O2 → 2 H2O + O2
50.ZnS + O2 → ZnO + SO2
51.4 HCl + O2 → 2 Cl2 + 2 H2O
52.Al2O3 + 6 HCl + 9 H2O → 2 [Al(H2O)6]3+ + 6 Cl
53.Al2O3 + 6 NaOH + 3 H2O → 2 Na3[Al(OH)6]
54.PbS + 4 O3 → PbSO4 + 4 O2
55.I + H2O + O3 → I2 + OH + O2
56.4 FeS2 + 11 O2 → 2 Fe2O3 + 8 SO2
57.2 NaOH + SO2 → Na2SO3 (white ppt.) + H2O
58.Na2SO3 + SO2 + H2O → NaHSO3 (colourless)
59.Ca(OH)2 + SO2 → CaSO3 (white ppt.) + H2O
60.CaSO3 + SO2 + H2O → Ca(HSO3)2 (colourless)
61.I2 + 6 H2O + 5 Cl2 → 2 HIO3 + 10 HCl
62.SO3 + H2SO4 → H2S2O7
63.2 Fe3+ + SO2 + 2 H2O → 2 Fe2+ + SO42- + 4 H+
64.2 MnO4 + SO2 + H2O → 5 Mn2+ + H+ + 2 SO42-
65.2 SO2 + O2 → 2 SO3 (V2O5 acts as catalyst)
66.C12H22O11 → 12 C + 11 H2O (occurs in presence of acid)
67.Cu + 2 H2SO4 (conc.) → CuSO4 + SO2 + 2 H2O
68.3 S + H2SO4 (conc.) → 3 SO2 + 2 H2O
69.C + H2SO4 (conc.) → CO2 + SO2 + H2O
70.CaF2 + H2SO4 (conc.) → CaSO4 + 2 HF
71.2 F2 + 2 H2O → 4 H+ + 4 F + O2
72.X2 + H2O → HX + HOX (X may be Cl or Br)
73.4 I + 4 H+ + O2 → 2 I2 + 2 H2O
74.MnO2 + 4 HCl → MnCl2 + Cl2 + 2 H2O
75.2 KMnO4 + 16 HCl → 2KCl + 2 MnCl2 + 8 H2O + 5 Cl2
76.8 NH3 + 3 Cl2 → 6 NH4Cl + N2
77.Cl2 + 3 F2 (excess) → 2 ClF3
78.NH3 + 3 Cl2 (excess) → NCl3 + 3 HCl
79.2 NaOH (cold and dil.) + Cl2 → NaCl + NaOCl + H2O
80.6 NaOH (hot and conc.) + 3 Cl2 → 5 NaCl + NaClO3 + 3 H2O
81.Ca(OH)2 + Cl2 → CaCl2 + Ca(OCl)2 + H2O
82.Au + 4H+ + NO3 + 4 Cl → AuCl4 + NO + 2 H2O
83.Pt + 16 H+ + 4 NO3 + 18 Cl → 3 PtCl62- + 4 NO + 8 H2O
84.XeF2 + H2O → Xe + HF + O2
85.6 XeF4 + 12 H2O → 4 Xe + 2 XeO3 + 24 HF + 3 O2
86.XeF6 + H2O → XeOF4 + 2 HF
87.XeF6 + 2 H2O → XeO2F2 + 4 HF
88.XeF6 + 3 H2O → XeO3 + 6 HF
89.XeF4 + O2F2 → XeF6 + O2
90.Xe + PtF6 → Xe+[PtF6]
91.XeF2 + PF5 → [XeF]+[PF6]
92.XeF4 + SbF5 → [XeF3]+[SbF6]
93.XeF6 + MF → M+[XeF7] (M may Na, K, Rb or Cs)
94.2 HNO3 → H2O + N2O5
95.P4 + 10 Cl2 → 4 PCl5

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