Ncert Solutions Chemistry Class 11th
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4.13. Write the resonance structures for SO3, NO2 and NO3.
4.13. Write the resonance structures for SO3, NO2 and NO3.
<p><strong>3.41. Assertion: The size of an anion will be larger than that of the parent atom.</strong></p>
<p><strong>Reason: The addition of one or more electrons would result in increased repulsion among the electrons and a decrease in effective nuclear charge</strong></p>
3.31. The first (ΔiH1) and the second (ΔiH2) ionization enthalpies (in kJ mol–1) and the (ΔegH) electron gain enthalpy (in kJ mol–1) of a few elements are given below:
Elements ΔH1 ΔH2 ΔegH
I 520 7300 –60
II 419 3051 –48
III 1681 3374 –328
IV 1008 1846 –295
V 2372 5251 +48
VI 738 1451 –40
Which of the above elements is likely to be:
(a) The least reactive element
(b) The most reactive metal
(c) The most reactive non-metal
(d) The least reactive non-metal
(e) The metal which can form a stable binary halide of the formula MX2 (X = halogen)
(f) The metal which can form a predominantly stable covalent halide of the formula MX (X = halogen)?
3.31. The first (ΔiH1) and the second (ΔiH2) ionization enthalpies (in kJ mol–1) and the (ΔegH) electron gain enthalpy (in kJ mol–1) of a few elements are given below:
Elements ΔH1 ΔH2 ΔegH
I 520 7300 –60
II 419 3051 –48
III 1681 3374 –328
IV 1008 1846 –295
V 2372 5251 +48
VI 738 1451 –40
Which of the above elements is likely to be:
(a) The least reactive element
(b) The most reactive metal
(c) The most reactive non-metal
(d) The least reactive non-metal
(e) The metal which can form a stable binary halide of the formula MX2 (X = halogen)
(f) The metal which can form a predominantly stable covalent halide of the formula MX (X = halogen)?
(a) The element V has the highest first ionization enthalpy (? iH1) and positive electron gain enthalpy (? egH) and hence it is the least reactive element. Since inert gases have positive? egH, therefore, the element-V must be an inert gas. The values of? iH1, ? iH2 and? egH match
Upvote 
A sparingly soluble salt having general formula Ap+x Bq- y and molar solubility S is in equilibrium with its saturated solution. Derive a relationship between the solubility and solubility product for such salt.
A sparingly soluble salt having general formula Ap+x Bq- y and molar solubility S is in equilibrium with its saturated solution. Derive a relationship between the solubility and solubility product for such salt.
The equation can be written as-
Ap+x + Bq- y ? xAp+ (aq) + yBq-
S moles of A and B dissolves to give x S moles of Ap+ and y S moles of Bq-.
Ksp = [Ap+]x [Bq-]y = [x5]x [y5]y
= xx y y 5 x+y
Upvote 40. Best reducing agent is:
(a) He (b) Be (c) Li (d) Al
40. Best reducing agent is:
(a) He (b) Be (c) Li (d) Al
Kindly go through the solution
(c) Li
Upvote 37. Which element is considered to have oxidation number of +3 in all its compounds?
(a) Be (b) Li (c) Al (d) Sc
37. Which element is considered to have oxidation number of +3 in all its compounds?
(a) Be (b) Li (c) Al (d) Sc
Kindly go through the solution
(c) Al
Upvote 36. Oxidation number ofS in S2O8-2 is
(a) -2 (b) -6 (c) +2 (d) +6
36. Oxidation number ofS in S2O8-2 is
(a) -2 (b) -6 (c) +2 (d) +6
Kindly go through the solution
(d) +6
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