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Actinoid elements show wide range of oxidation states.
Concept: F-block Elements >> The Actinoids
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: Chemical Reactions of Aldehydes and Ketones - Nucleophilic Addition Reactions
Why is the α-hydrogens of aldehydes and ketones are acidic in nature?
Concept: Chemical Reactions of Aldehydes and Ketones - Reactions Due to α-hydrogen
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: Chemical Reactions of Amines - Electrophilic Substitution
Give simple chemical tests to distinguish between the following pair of compounds:
Benzaldehyde and Benzoic acid
Concept: Nomenclature of Amines
What is Hinsberg's reagent?
Concept: Chemical Reactions of Amines - Reaction with Arylsulphonyl Chloride
Give reasons for the following:
Ammonolysis of alkyl halides is not a good method to prepare pure primary amines.
Concept: Preparation of Amines
Evaluate: `int_0^π (x sin x)/(1 + cos^2x) dx`.
Concept: Methods of Integration>Integration Using Trigonometric Identities
Write S.I unit of electric flux.
Concept: Electric Flux
Derive an expression for the mutual inductance of two long co-axial solenoids of same length wound one over the other,
Concept: Solenoid
Why is it necessary to introduce a cylindrical soft iron core inside the coil of a galvanometer?
Concept: Moving Coil Galvanometer
Identify the part of the electromagnetic spectrum which is suitable for radar system used in aircraft navigation.
Concept: Electromagnetic Spectrum
Write two uses of the following radiation.
X-rays
Concept: Electromagnetic Spectrum
Write two important limitations of a refracting telescope over a reflecting-type telescope.
Concept: Optical Instruments >> Telescope
With the help of a diagram, show how a plane wave is reflected from a surface. Hence, verify the law of reflection.
Concept: Reflection of a Plane Wave by a Plane Surface
Define the term 'intensity of radiation' in terms of photon picture of light.
Concept: Experimental Study of Photoelectric Effect
Write Einstein’s photoelectric equation?
Concept: Einstein’s Photoelectric Equation: Energy Quantum of Radiation
Write two important limitations of Rutherford's nuclear model of the atom.
Concept: Alpha-particle Scattering and Rutherford’s Nuclear Model of Atom
