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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 `∧_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 `∧_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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Predict the products formed when cyclohexanecarbaldehyde reacts with the following reagents.
Zinc amalgam and dilute hydrochloric acid
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How will you bring about the following conversion in not more than two steps?
Propanone to Propene
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How will you bring about the following conversion in not more than two steps?
Benzoic acid to m-Nitrobenzyl alcohol
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Complete the synthesis by giving missing starting material, reagent or product.
\[\ce{CH3COCH2COOC2H5 ->[(i) NaBH4][(ii) H+]}\]
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Write the equation involved in the following reaction:
Kolbe’s reaction
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While separating a mixture of ortho and para nitrophenols by steam distillation, name the isomer which will be steam volatile. Give reason.
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Give the equation of the following reaction:
Bromine in CS2 with phenol.
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Name the reagent used in the following reaction:
Bromination of phenol to 2, 4, 6-tribromophenol.
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