Draw the structures of the following molecules: XeF4
Concept: P - Block Group 18 Elements > Concept of Group 18 Elements
Define terms: Fuel cell
Concept: Batteries > Primary Batteries
Write the chemical equations involved in the following reactions:(i) Hoffmann-bromamide degradation reaction
Concept: Amines > Preparation of Amines
Amino acids show amphoteric behaviour. Why?
Concept: Proteins > Amino Acids
How do you convert the Toluene to Benzoic acid
Concept: Carboxylic Acids > Nomenclature
Illustrate the following reaction giving suitable example in each case:Gabriel phthalimide synthesis
Concept: Amines > Preparation of Amines
Define the following terms: Essential amino acids
Concept: Proteins > Amino Acids
Why is bithional added to soap?
Concept: Cleansing Agents - Soaps
An element 'X' (At. mass = 40 g mol-1) having f.c.c. the structure has unit cell edge length of 400 pm. Calculate the density of 'X' and the number of unit cells in 4 g of 'X'. (NA = 6.022 × 1023 mol-1)
Concept: Number of Atoms in a Unit Cell
Calculate the freezing point of a solution containing 60 g of glucose (Molar mass = 180 g mol–1) in 250 g of water. (Kf of water = 1.86 K kg mol–1)
Concept: Colligative Properties and Determination of Molar Mass > Depression of Freezing Point
Give reasons for the following:
Measurement of osmotic pressure method is preferred for the determination of molar masses of macromolecules such as proteins and polymers.
Concept: Colligative Properties and Determination of Molar Mass > Depression of Freezing Point
Give reasons for the following :
Aquatic animals are more comfortable in the cold water than in warm water.
Concept: Solubility > Solubility of a Gas in a Liquid
Give reasons for the following
Elevation of the boiling point of 1 M KCl solution is nearly double than that of 1 M sugar solution.
Concept: Abnormal Molar Masses
Write the cell reaction and calculate the e.m.f of the following cell at 298 K:
`Sn(s) | Sn^(2+) (0.004 M) || H^(+) (0.020 M) | H_2 (g) ("1 bar") | Pt(s)`
(Given: `E_(Sn^(2+)"/"Sn)^0 = -0.14` V)
Concept: Galvanic Cells - Measurement of Electrode Potential
Give reasons On the basis of E° values, O2 gas should be liberated at anode but it is Cl2 gas which is liberated in the electrolysis of aqueous NaCl.
Concept: Conductance of Electrolytic Solutions > Measurement of the Conductivity of Ionic Solutions
Give reasons Conductivity of CH3COOH decreases on dilution.
Concept: Conductance of Electrolytic Solutions > Measurement of the Conductivity of Ionic Solutions
For the reaction
`2AgCl (s) + H_2 (g) ("1 atm") -> 2Ag (s) + 2H^(+) (0.1 M) + 2Cl^(-) (0.1 M)`
`triangleG^0 = -43600 J at 25^@ C`
Calculate the e.m.f. of the cell
`[log 10^(-n) = -n]`
Concept: Relation Between Gibbs Energy Change and Emf of a Cell
For the reaction
2N2O5 (g) → 4NO2 (g) + O2 (g), the rate of formation of NO2 (g) is 2·8 × 10–3 M s–1. Calculate the rate of disappearance of N2O5 (g).
Concept: Rate of a Chemical Reaction
A first-order reaction is 50% completed in 40 minutes at 300 K and in 20 minutes at 320 K. Calculate the activation energy of the reaction. (Given : log 2 = 0·3010, log 4 = 0·6021, R = 8·314 JK–1 mol–1)
Concept: Temperature Dependence of the Rate of a Reaction
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