Which of the following statements is/are correct ?A. An aqueous solution of `Co(II)` thiocyanate `(10%` freshly prepared) and mercuric nitrate solution taken in equal volumes on stirring the wall of the vessel with a glass rod produce deep-blue precipitate.B. White precipitate of `Al(OH)_(3)` is soluble in sodium hydroxide as well as in ammonia solutionC. Green precipitate of `Cr(OH)_(3)` readily dissolves in excess of sodium hydroxide forming a green solutionD. Chromium (III) salts give green coloured borax bead in both oxidising and reducing flame.

Which of the following statements is/are correct ?A. An aqueous soluti

1.	Which of the following statements is/are correct ?A. An aqueous solution of `Co(II)` thiocyanate `(10%` freshly prepared) and mercuric nitrate solution taken in equal volumes on stirring the wall of the vessel with a glass rod produce deep-blue precipitate.B. White precipitate of `Al(OH)_(3)` is soluble in sodium hydroxide as well as in ammonia solutionC. Green precipitate of `Cr(OH)_(3)` readily dissolves in excess of sodium hydroxide forming a green solutionD. Chromium (III) salts give green coloured borax bead in both oxidising and reducing flame.
Answer» Correct Answer - A,C,D (A)`Hg^(2+)+Co^(2+)+4SCN^(-)toCo[Hg(SCN)_(4)]darr`(deep blue), (B)Soluble in `NaOH`forming `[Al(OH)_(4)]^(-)`, not in `NH_(3)(aq)` (C )`Cr(OH)_(3)darr ("green")+OH^(-) hArr [Cr(OH)_(4)]^(-)`(green solution) (D)Correct statement.

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