A given nitrogen-containing aromatic compound A reacts with Sn/HCl, followed by HNO2 to give an unstable compound B. B, on treatment with phenol, forms a beautiful coloured compound C with the molecular formula C12H10N2O. The structure of compound A is :
Iron and manganese are removed in water by the process of:
Consider the following four particles :
Which of the following is the correct sequence in which their rest-masses increase?
Which among the following thermometers is preferred for measuring temperature around 1250°C?
One light year is equal to
The resistance of a wire that must be placed parallel with a 12 Ω resistance to obtain a combined resistance of 4 Ω is