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Three-point charges q, – 4q and 2q are placed at the vertices of an equilateral triangle ABC of side 'l' as shown in the figure. Obtain the expression for the magnitude of the resultant electric force acting on the charge q
(b) Find out the amount of the work done to separate the charges at infinite distance.
Concept: Coulomb’s Law >> Scalar Form of Coulomb’s Law
In a potentiometer arrangement for determining the emf of a cell, the balance point of the cell in open circuit is 350 cm. When a resistance of 9 Ω is used in the external circuit of the cell, the balance point shifts to 300 cm. Determine the internal resistance of the cell.
Concept: Cells, Emf, Internal Resistance
Using the concept of free electrons in a conductor, derive the expression for the conductivity of a wire in terms of number density and relaxation time. Hence obtain the relation between current density and the applied electric field E.
Concept: Specific Resistance
Write the underlying principle of a moving coil galvanometer.
Concept: Moving Coil Galvanometer
State Ampere’s circuital law.
Concept: Ampere’s Circuital Law
Define mutual inductance.
Concept: Inductance >> Mutual Inductance
What do you understand by the statement, "Electromagnetic waves transport momentum"?
Concept: Electromagnetic Spectrum
Explain the effect on the characteristics of a river when urban sewage is discharged into it.
Concept: Biodiversity
Name any two biodiversity hot spots in India.
Concept: Loss of Biodiversity
What type of azeotrope is formed by positive deviation from Raoult’s law?
Concept: Vapour Pressure of Liquid >> Vapour Pressure of Liquid- Liquid Solutions
Define the following term:
Fuel cell
Concept: Electrochemical Cells
How would you account for the following: Transition metals form complex compounds.
Concept: General Properties of the Transition Elements (D-block)
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)
Write one similarity and one difference between the chemistry of lanthanoid and actinoid elements.
Concept: F-block Elements >> The Actinoids
Give reasons for the following:
The transition metals generally form coloured compounds.
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)
Explain the following reaction:
Wolff-Kishner reduction
Concept: Aldehydes and Ketones >> Chemical Reactions of Aldehydes and Ketones - Reduction
Explain the following reaction:
Cannizzaro reaction
Concept: Aldehydes and Ketones >> Chemical Reactions of Aldehydes and Ketones - Other Reactions
Write chemical test to distinguish between the following compounds:
Phenol and Benzoic acid
Concept: Aldehydes and Ketones >> Chemical Reactions of Aldehydes and Ketones - Oxidation
Why vitamin C cannot be stored in our body?
Concept: Vitamins >> Classification of Vitamins
