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Account for the following:
E° value for the Mn3+/Mn2+ couple is much more positive than that for Cr3+/Cr2+.
Concept: General Properties of the Transition Elements (d-block)
On the basis of crystal field theory, write the electronic configuration for d4 ion if ∆0 < P.
Concept: Bonding in Coordination Compounds >> Crystal Field Theory (CFT)
Why vitamin C cannot be stored in our body?
Concept: Vitamins >> Classification of Vitamins
Find the distance of the point (−1, −5, −10) from the point of intersection of the line `vecr=2hati-hatj+2hatk+lambda(3hati+4hatj+2hatk) ` and the plane `vec r (hati-hatj+hatk)=5`
Concept: Three - Dimensional Geometry Examples and Solutions
Define azeotropes.
Concept: Vapour Pressure of Liquid >> Vapour Pressure of Liquid- Liquid Solutions
What type of deviation is shown by a mixture of ethanol and acetone? Give reason.
Concept: Vapour Pressure of Liquid >> Vapour Pressure of Liquid- Liquid Solutions
State Kohlrausch’s law of independent migration of ions.
Concept: Conductance of Electrolytic Solutions >> Variation of Conductivity and Molar Conductivity with Concentration
The following data were obtained during the first order thermal decomposition of SO2Cl2 at a constant volume :
SO2Cl2 (g) → SO2 (g) + Cl2 (g)
| Experiment | Time/s–1 | Total pressure/atm |
| 1 | 0 | 0.4 |
| 2 | 100 | 0.7 |
Calculate the rate constant.
(Given : log 4 = 0.6021, log 2 = 0.3010)
Concept: Factors Influencing Rate of a Reaction
Give reasons:
Transition metals show variable oxidation states.
Concept: General Properties of the Transition Elements (d-block)
Complete the following equation : MnO4- + 8H+ + 5e- →
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
Account for the following : Nitrogen does not form pentahalide.
Concept: Group 15 Elements - The Nitrogen Family >> Dinitrogen
Draw the structure of the semicarbazone of ethanal.
Concept: Concepts of Aldehydes, Ketones, and Carboxylic Acids >> Chemical Reactions of Aldehydes and Ketones - Nucleophilic Addition Reactions
Account for the following:
Although the amino group is o, p-directing in aromatic electrophilic substitution reactions, aniline on nitration gives a substantial amount of m-nitroaniline.
Concept: Concept of Amines >> Chemical Reactions of Amines - Electrophilic Substitution
Write two important limitations of Rutherford's nuclear model of the atom.
Concept: Alpha-particle Scattering and Rutherford’s Nuclear Model of Atom
Describe the structure of a nucleosome.
Concept: Packaging of DNA
State Henry’s law.
Concept: Solubility >> Solubility of a Gas in a Liquid
A solution containing 15 g urea (molar mass = 60 g mol–1) per litre of solution in water has the same osmotic pressure (isotonic) as a solution of glucose (molar mass = 180 g mol–1) in water. Calculate the mass of glucose present in one litre of its solution.
Concept: Colligative Properties and Determination of Molar Mass >> Osmosis and Osmotic Pressure
Define limiting molar conductivity.
Concept: Conductance of Electrolytic Solutions >> Variation of Conductivity and Molar Conductivity with Concentration
How would you account for the following:
The chemistry of actinoids is more complicated as compared to lanthanoids.
Concept: F-block Elements >> The Actinoids
Account for the following:
Zn is not considered as a transition element.
Concept: General Properties of the Transition Elements (d-block)
