Aqua regia is a 1:3 mixture by volume of
1). conc. nitric acid and cone hydrochloric acid
2). cone hydrochloric acid and cone nitric acid
3). cone nitric acid and cone sulphuric acid
4). conc. sulphuric acid and cone nitric acid
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1. The polymer obtained by the condensation of hexamethylene diamine and adipic acid is :
2. Pasteurization is the process in which milk is heated to
5. What causes the mottling of the dental enamel ?
6. The main mineral constituents of the continental mass are ________ and alumina.
10. The property of hydrogen which distinguishes it from alkali metals is