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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 Solutions >> 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: Physical 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: Physical 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 reason for the following:
The transition metals generally form coloured compounds.
Concept: Physical 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: Chemical Reactions of Aldehydes and Ketones - Reduction
Explain the following reaction:
Cannizzaro reaction
Concept: Chemical Reactions of Aldehydes and Ketones - Other Reactions
Write chemical test to distinguish between the following compounds:
Phenol and Benzoic acid
Concept: Chemical Reactions of Aldehydes and Ketones - Oxidation
Why vitamin C cannot be stored in our body?
Concept: Classification of Vitamins
Draw a necessary arrangement for winding of primary and secondary coils in a step-up transformer. State its underlying principle and derive the relation between the primary and secondary voltages in terms of number of primary and secondary turns. Mention the two basic assumptions used in obtaining the above relation.
Concept: Inductance >> Mutual Inductance
Draw graphs showing variation of photoelectric current with applied voltage for two incident radiations of equal frequency and different intensities. Mark the graph for the radiation of higher intensity.
Concept: Experimental Study of Photoelectric Effect
Draw a diagram of the mature embryo sac of an angiospermic ovule and label any four parts in it.
Concept: Development of Female Gametophyte or Embryo Sac
Medically it is advised to all young mothers that breast-feeding is the best for their newborn babies. Do you agree? Give reasons in support of your answer.
Concept: Pregnancy and Embryonic Development
Explain menstrual cycle in human females.
Concept: Menstrual Cycle (Ovarian Cycle)
How can the scientific understanding of the menstrual cycle of human females help as a contraceptive measure?
Concept: Menstrual Cycle (Ovarian Cycle)
Explain the mechanism of 'sex determination' in birds. How does it differ from that of human beings?
Concept: Sex Determination
