name the chemical compound whose crystal is red colour?
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It is possible to grow crystals that are naturally red.  You grow them from potassium ferricyanide (not the same as cyanide).  \n\nThese links have more information about red crystals.  I hope this helps.
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N-(4-hydroxyphenyl)acetamide\n\nC8H9NO2
93827
Diamond. It is pure carbon.
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crystal drano\nNaOH\n\nSodium Bicarbonate (baking soda)\nNaHCO3\n\nAcetic Acid (vinegar 4%)\nH3CCOOH
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Nitrogen triiodide is a feisty one:\n\nhttp://en.wikipedia.org/wiki/Nitrogen_triiodide
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Some mercury compounds take the form of crystals.\n\nInorganic mercury compounds take the form of mercury salts and are generally white powder or crystals, with the exception of mercuric sulfide (cinnabar) which is red. Inorganic mercury compounds have been included in products such as fungicides, antiseptics or disinfectants. Some skin lightening and freckle creams, as well as some traditional medicines, can contain mercury compounds.
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RED: Strontium compounds; YELLOW: Sodium compounds; GREEN: Barium compounds; BLUE: Copper compounds plus a chlorine producer; PURPLE: a mixture of strontium and copper compounds; GOLD: charcoal or lampblack; SILVER: burning titanium, aluminum or magnesium powder or flakes.
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(NH4)2Cr2O7 -> Cr2O3 + 4*(H2O) + N2\n\n(NH4)2SO4 + 2*(NaOH) -> 2*(NH3) + 2*(H2O) + Na2SO4\n\nFe2(SO4)3 + 6*(NH3) + 6*(H2O) -> 2*(Fe(OH)3) + 3*((NH4)2SO4)
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AgNO3(aq)+2Na2S2O3(aq)--> [Ag(S2O3)2]3-(aq) + 4Na+(aq)+ NO3-(aq)
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Color, shape, hardness, melting point, boiling point, density
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Cr2(SO4)3 + 6KOH  --> 2Cr(OH)3 + 3K2SO4
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http://www.crystalxp.net/galerie/en.id.130.htm
149062
The question is not clear.  Are you asking what a crystal is?  Are you asking what the different crystal structures are?  Are you asking for the characteristics of crystals in general?
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Actually the answer is Tungsten.  Rhenium is close, boiling at 5627c (9,668.93 degrees Fahrenheit), but the king of boiling points is still Tungsten at 5660c (10,220 degrees Fahrenheit)\n\nThere could be others, but many elements don't really stick around long enough for us to test their boiling point.
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Iron (III) Chloride Hexahydrate
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flammable , orderless, colorless . have low frozen point ,reactive
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Ionic compounds (like NaCl) for lattice structures.  These lattice structures make up the crystaline arrangement of the compound.\n\nThe lattice of NaCl looks like a cube,\nhttp://zimmer.csufresno.edu/~davidz/Chem3AF97/ChB/IonicBond.html\nhttp://departments.kings.edu/chemlab/chemlab_v2/nacl.html