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Electrochemistry — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryElectrochemistry5 Marks
Question
Describe the standard hydrogen electrode with diagram.
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Match the statements given in Column I and Column II.
 
Column I
 
Column II
(i)
Catalyst alters the rate of reaction.
(a)
Cannot be fraction or zero.
(ii)
Molecularity
(b)
Proper orientation is not there always.
(iii)
Second half life of first order reaction
(c)
By lowering the activation energy.
(iv)
$\text{e}^{\frac{-\text{Ea}}{\text{RT}}}$
(d)
Is same as the first.
(v)
Energetically favourable reactions are sometimes slow.
(e)
Total probability is one.
(vi)
Area under the Maxwell Boltzman curve is constant.
(f)
Refers to the fraction of molecules with energy equal to or greater than activation energy.
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Magnetic properties of coordination compounds. Explain in detail.
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Derive the equation required for finding the activation energy.
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Answer the following question:
What is the freezing point of 0.4 molal solution of acetic acid in benzene in which it dimerises to the extent of 85%? Freezing point of benzene is 278.4K and its molar heat of fusion is 10.042kJ mol-1.
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  1.  
  1. How is the variability in oxidation states of transition metals different from that of the p-block elements?
  2. Out of Cu+ and Cu2+, which ion is unstable in aqueous solution and why?
  3. Orange colour of Cr2O72– ion changes to yellow when treated with an alkali. Why?
  1. Chemistry of actinoids is complicated as compared to lanthanoids. Give two reasons.
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Describe the differences in the properties of lanthanoids and actinoids.
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Describe the methods of studying various first order reactions with examples.
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Answer the following questions:
Assign reasons for the following:
  1. In the series Sc (Z = 21) to Zn (Z = 30), the enthalpy of atomisation of Zn is the lowest.
  2. Zr and Hf have almost identical radii.
  3. Transition metals show variable oxidation states.
  4. The E°M2+/M value for copper is positive (+0.34 V).
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Assign reasons for the following:
  1. The enthalpies of atomisation of transition elements are high.
  2. The transition metals and many of their compounds act as good catalyst.
  3. From element to element the actinoid contraction is greater than the lanthanoid contraction.
  4. The E0 value for the Mn3+/Mn2+ couple is much more positive than that for Cr3+/Cr2+.
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Match the complex ions given in Column I with the hybridisation and number of unpaired electrons given in Column II and assign the correct code:
 
Column I (Complex ion)
 
Column II (Hybridisation, number of unpaired electrons)
a.
[Cr(H2O)6]3+
1.
dsp2, 1
b.
[Co(CN)4]2-
2.
sp3d2, 5
c.
[Ni(NH3)6]2+
3.
d2sp3, 3
d.
[MnF6]4-
4.
sp3, 4
 
 
5.
sp3d2, 2
Code:
  1. A (3), B (1), C (5), D (2).
  2. A (4), B (3), C (2), D (1).
  3. A (3), B (2), C (4), D (1).
  4. A (4), B (1), C (2), D (3).
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