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Niobium crystallises in body-centred cubic structure. If density is 8.55 g cm−3, calculate atomic radius of niobium using its atomic mass 93 u.
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The molar conductivity of 0.025 mol L−1 methanoic acid is 46.1 S cm2 mol−1. Calculate its degree of dissociation and dissociation constant. Given \[\ce{λ^0_{(H^+)}}\] = 349.6 S cm2 mol−1 and \[\ce{λ^0_{(HCOO^-)}}\] = 54.6 S cm2 mol−1.
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The conductivity of sodium chloride at 298 K has been determined at different concentrations and the results are given below:
| Concentration/M | 0.001 | 0.010 | 0.020 | 0.050 | 0.100 |
| 102 × κ/S m−1 | 1.237 | 11.85 | 23.15 | 55.53 | 106.74 |
Calculate ∧m for all concentrations and draw a plot between ∧m and c1/2. Find the value of `Lambda_m^0`.
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Conductivity of 0.00241 M acetic acid is 7.896 × 10−5 S cm−1. Calculate its molar conductivity and if `Lambda_m^0` for acetic acid is 390.5 S cm2 mol−1, what is its dissociation constant?
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Describe some features of catalysis by zeolites.
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What is shape selective catalysis?
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Copper can be extracted by hydrometallurgy but not zinc. Explain.
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What is the role of cryolite in the metallurgy of aluminium?
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What is the role of graphite rod in the electrometallurgy of aluminium?
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How does the presence of double bonds in rubber molecules influence their structure and reactivity?
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Discuss the main purpose of vulcanisation of rubber.
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Identify the monomer in the following polymeric structures.
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An organic compound with the molecular formula C9H10O forms 2, 4-DNP derivative, reduces Tollens’ reagent and undergoes Cannizzaro reaction. On vigorous oxidation, it gives 1, 2-benzenedicarboxylic acid. Identify the compound.
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Describe the following:
Cannizzaro reaction
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Ortho and para nitrophenols are more acidic than phenol. Draw the resonance structures of the corresponding phenoxide ions.
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Show how will you synthesize pentan-1-ol using a suitable alkyl halide.
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Give the equation of the following reaction:
Oxidation of propan-1-ol with alkaline KMnO4 solution.
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Give the equation of the following reaction:
Dilute HNO3 with phenol.
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Give the equation of the following reaction:
Treating phenol with chloroform in the presence of aqueous NaOH.
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Write the mechanism of acid-catalysed dehydration of ethanol to yield ethene.
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