Ncert Solutions Chemistry Class 11th
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8.24. Refer to the periodic table given in your book and now answer the following questions.
(a) Select the possible non-metals that can show disproportionation reaction.
(b) Select three metals that show disproportionation reaction.
8.24. Refer to the periodic table given in your book and now answer the following questions.
(a) Select the possible non-metals that can show disproportionation reaction.
(b) Select three metals that show disproportionation reaction.
(a) Phosphorous, chlorine and sulphur are the non metals which can show disproportionation reaction. The reactions shown are:
P4? + 3OH? + 3H2? O? PH3? + 3H2? PO2?
? Cl2? + 2OH? ? Cl? + ClO? + H2? O
S8? +12OH? ?4S2? +2S2? O32? ? +6H2? O
(b) Copper, gallium and indium are the metals that sho
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5.32. Which of the following gases will have the lowest rate of diffusion?
(a) H2
(b) N2
(c) F2
(d) O2
5.32. Which of the following gases will have the lowest rate of diffusion?
(a) H2
(b) N2
(c) F2
(d) O2
8.23. Chlorine is used to purify drinking water. Excess of chlorine is harmful. The excess of chlorine is removed by treating with sulphur dioxide. Present a balanced equation for this redox change taking place in water.
8.23. Chlorine is used to purify drinking water. Excess of chlorine is harmful. The excess of chlorine is removed by treating with sulphur dioxide. Present a balanced equation for this redox change taking place in water.
The balanced chemical reaction for the redox reaction between chlorine and sulphur dioxide is:
Cl2? + SO2? + 2H2? O → 2Cl− + SO42− ? + 4H+.
Upvote 8.22. Consider the elements:
Cs, Ne, I, F
(a) Identify the element that exhibits negative oxidation state.
(b) Identify the element that exhibits positive oxidation state.
(c) Identify the element that exhibits both positive and negative oxidation states.
(d) Identify the element which neither exhibits negative nor does the positive oxidation state.
8.22. Consider the elements:
Cs, Ne, I, F
(a) Identify the element that exhibits negative oxidation state.
(b) Identify the element that exhibits positive oxidation state.
(c) Identify the element that exhibits both positive and negative oxidation states.
(d) Identify the element which neither exhibits negative nor does the positive oxidation state.
(a) F. Fluorine being the most electronegative element shows only a -ve oxidation state of -1.
(b) Cs. Alkali metals because of the presence of a single electron in the valence shell, exhibit an oxidation state of +1.
(c) I. Because of the presence of seven electrons in the valence shell, I shows a
Upvote 8.21. The Mn3+ ion is unstable in solution and undergoes disproportionation to give Mn2+, MnO2 and H+ ion. Write a balanced ionic equation for the reaction.
8.21. The Mn3+ ion is unstable in solution and undergoes disproportionation to give Mn2+, MnO2 and H+ ion. Write a balanced ionic equation for the reaction.
The unbalanced chemical reaction is:
Mn3+ (aq) → Mn2+ (aq) + MnO2? (s) + H+ (aq)
The oxidation half reaction is,
Mn3+ (aq) → MnO2? (s).
To balance oxidation number, one electron is added on R.H.S.
Mn3+ (aq) → MnO2? (s) + e−
4 protons are added to balance the charge.
Mn3+ (aq) → MnO2? (s) + 4H+ (aq)
Upvote MCQs:
5.28. The average kinetic energy of the gas molecule is
(a) Inversely proportional to its absolute temperature
(b) Directly proportional to its absolute temperature
(c) Equal to the square of its absolute temperature
(d) All of the above
MCQs:
5.28. The average kinetic energy of the gas molecule is
(a) Inversely proportional to its absolute temperature
(b) Directly proportional to its absolute temperature
(c) Equal to the square of its absolute temperature
(d) All of the above
5.28. (b) directly proportional to its absolute temperature
Upvote 8.20. What sorts of information can you draw from the following reaction?
(CN)2(g) + 2OH–(aq) → CN–(aq) + CNO–(aq) + H2O(l)
8.20. What sorts of information can you draw from the following reaction?
(CN)2(g) + 2OH–(aq) → CN–(aq) + CNO–(aq) + H2O(l)
Let x be the O.N. of C.
O.N. of C in cyanogen, (CN)2 = 2 (x – 3) = 0 or x = +3
O.N. of C in cyanide ion, CN- = x – 3 = -1 or x = +2
O.N. of C in cyanate ion, CNO =x-3-2 = -l or x: = +4
The four information about the reaction are:
(i) The reaction involves decomposition of cyanogen, (CN)2 in th
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