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Give reasons for the following:
Aniline does not undergo Friedel- Crafts reaction.
Concept: Chemical Reactions of Amines - Electrophilic Substitution
State the two Kirchhoff’s rules used in electric networks. How are there rules justified?
Concept: Kirchhoff’s Laws
In a single slit diffraction experiment, the width of the slit is made double the original width. How does this affect the size and intensity of the central diffraction band?
Concept: Diffraction of Light >> The Single Slit
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
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
An analysis shows that FeO has a non-stoichiometric composition with formula Fe0.95O. Give reason.
Concept: Physical Properties of the Transition Elements (d-block)
Complete and balance the following chemical equations
`Fe^(2+) + MnO_4^(-) + H^+ ->`
Concept: Physical Properties of the Transition Elements (d-block)
Complete and balance the following chemical equations
`MnO_4^(-) + H_2O + I^(-) ->`
Concept: Physical Properties of the Transition Elements (d-block)
Give reasons:
E° value for the Mn3+/Mn2+ couple is much more positive than that for Fe3+/Fe2+.
Concept: Physical Properties of the Transition Elements (d-block)
Give reasons Iron has the higher enthalpy of atomization than that of copper.
Concept: Physical Properties of the Transition Elements (d-block)
Give reasons: Sc3+ is colourless in aqueous solution whereas Ti3+ is coloured.
Concept: Physical Properties of the Transition Elements (d-block)
Write the formula for the following coordination compound:
Iron (III) hexacyanoferrate (II)
Concept: Concept of Coordination Compounds
CO (g) and H2 (g) react to give different products in the presence of different catalysts. Which ability of the catalyst is shown by these reactions?
Concept: Catalysis >> Catalysts in Industry
What happens when a freshly prepared precipitate of Fe(OH)3 is shaken with a small amount of FeCl3 solution?
Concept: Properties of Colloidal Solutions
What happens when persistent dialysis of a colloidal solution is carried out?
Concept: Properties of Colloidal Solutions
What happens when an emulsion is centrifuged?
Concept: Properties of Colloidal Solutions
