Assertion (A): The colour of copper sulphate solution changes when a piece of zinc is dropped in it Reason (R): Copper is more reactive than zinc. ABoth A and R are true and R is the correct explanation of A. BBoth A and Rare true and R is the not the correct explanation of ...
In examples: (1) an aqueous solution of the copper phthalocyanine sulphonic acid sodium salt obtained by fusing the sodium salt of 4-sulphophthalic acid with urea and cuprous chloride is stirred with the precipitate obtained by adding caustic soda and barium chloride solution to a suspension of ...
The effluent from acid/alkaline extraction can affect the pH of aqueous environment, which may disturb the life of living organisms. To overcome some of the limitations of aqueous extraction method, sonicator and microwave extractions are used. With the ultrasonic and microwave assisted extraction ...
View Solution When a student added zinc granules to dilute HCI, a colourless and odourless gas was evolved, which was then tested with a burning match stick, what would be observed? View Solution A white solid reacts with dilute HCI to give colourless gas that de-colourises aqueous bromine...
Colour of chemical Ions in aqueous solution Name Formula Color Titanium (III)Ti3+ Violet Vanadium (II)V2+ Lavender Vanadium (III)V3+ Dark grey/green Vanadyl VO2+ Blue Pervanadyl VO2+ Yellow Chromium (III)Cr3+ Blue-green Chromate CrO4 2- Colorless or Yellow(sometimes)Dichromate Cr2O72- O...
The book on how to make all the colour paints for illuminating books invites readers to step inside the workshop of a fifteenth century illuminator in Portugal. This illuminator was the carrier of a tradition on how to make colours with ‘which you can i
some of them have been used in painting as well, asjuices, i.e. simple aqueous extracts, orlakes, i.e. juices chemically or physically fixed on white inorganic substrates. Lakes are specific to art of painting, but there are strong similarities in the mechanisms of fixing dyes on fabrics...
A subtractive transparency is produced in a single silver emulsion on one side of a transparent carrier by printing a first image, for example through the back of the support, developing without fixing, hardening with formalin, and bleaching, as by an aqueous solution of sodium bichromate, of ...
Timan I, Tatsumi N, Aulia D, Wangsasaputra E. Comparison of haemoglobinometry by WHO Haemo- globin Colour Scale and copper sulphate against haemi- globincyanide reference method. Clin Lab Haematol. 2004;26(4):253-8.Timan IS, Tatsumi N, Aulia D, Wangsasaputra E. Comparison of haemoglobin...
The aim was threefold: (1) to determine the structure of natural patinas and to relate their structure to their appearance in service and to the atmospheric corrosion of copper; (2) to understand why a brown rust coloured layer forms on the surface of some copper patinas; (3) to ...