reason for the following:
(a) Mercury (II) iodide is brick red in colour.
(b) The aqueous solution of NiSO4 which is pale green turns deep blue on addition of ethylenediamine.
(a). Mercury (II) iodide is brick red in colour because Mercury(II) iodide displays thermochromism; when heated above 126 °C (400°K) it undergoes a phase transition, from the red alpha crystalline form to a pale yellow beta form. As the sample cools, it gradually reacquires its original colour. It has often used for thermochromism demonstrations. A third orange form is also known; this can be formed by recrystallisation and is also metastable, eventually converting
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reason for the following:
(a) Mercury (II) iodide is brick red in colour.
(b) The aqueous solution of NiSO4 which is pale green turns deep blue on addition of ethylenediamine.
Derive the following expression:
Discuss the ESR spectrum of ethyl radical.
Draw and explain the important components of an ESR spectrometer.
What is the shape of BF3 molecule? Draw the symmetry elements present in it.
Draw the vibrational modes of N2O molecule. What is its point group and geometry?
The hydrogen atoms attached to a double bond are deshielded while in case of alkynes the protons are shielded. Explain.