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why YbS and YbI2 are semiconducting solids but LaS and LaI2 show metallic character..
transition elements form coloured compound. Why?
An example for trihydric phenols
By the action of CO on methyl alcohol Methyl alcohol and carbon monoxide react together under a pressure of 30 atmospheres and 200°C in presence of a catalyst cobalt octacarbon
Silicon has 4 electrons in the outermost orbit. In forming the bonds: (1) It gains electrons (2) It loses electrons (3) It shares electrons (4) None of these Ans: I
What are the effects on transport number?
Give the name of the molecular shape of each of the following. (1 mark each) 1) silicon tetraiodide
The radius of first Bohr's orbit for hydrogen is 0.53 Å. The radius of third Bohr's orbit would be: (1) 0.79 Å (2) 1.59 Å (3) 3.18 Å (4)4.77 Å
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