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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: Concepts of Aldehydes, Ketones, and Carboxylic Acids >> Chemical Reactions of Aldehydes and Ketones - Reduction
Explain the following reaction:
Cannizzaro reaction
Concept: Concepts of Aldehydes, Ketones, and Carboxylic Acids >> Chemical Reactions of Aldehydes and Ketones - Other Reactions
Write chemical test to distinguish between the following compounds:
Phenol and Benzoic acid
Concept: Concepts of Aldehydes, Ketones, and Carboxylic Acids >> Chemical Reactions of Aldehydes and Ketones - Oxidation
Why vitamin C cannot be stored in our body?
Concept: Biomolecules in the Cell > 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
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
Why does an unpolarised light incident on a polaroid get linearly polarised ?
Concept: Polarisation
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 circuit diagram of a transistor amplifier in CE configuration.
Concept: Junction Transistor >> Transistor as an Amplifier (Ce-configuration)
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
Write the names of the following:
A 15 mya primate that was ape-like
Concept: Human Evolution
Write the names of the following:
A 2 mya primate that lived in East African grasslands
Concept: Human Evolution
With the help of an algebraic equation, how did Hardy-Weinberg explain that in a given population the frequency of occurrence of alleles of a gene is supposed to remain the same through generations?
Concept: Hardy Weinberg’s Principle
