On performing a borax-bead test with a given inorganic mixture for qualitative analysis,the colour of the bead was found to be emerald green both in oxidising and reducing flame. It indicates the possibility of the presence of
- A$Co^{2+}$
- B$Ni^{2+}$
- C$Cr^{3+}$
- D$Cu^{2+}$
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Match List-$I$ with List-$II$:
List-$I$ Solid salt treated with dil. $H_2SO_4$ List-$II$ Anion detected $A.$ Effervescence of colourless gas $I.$ $NO_2^-$ $B.$ Gas with smell of rotten egg $II.$ $CO_3^{2-}$ $C.$ Yellowish green gas with pungent and suffocating smell $III.$ $S^{2-}$ $D.$ Brown fumes $IV.$ $Cl^{-}$
Choose the correct answer from the options given below:
| List-$I$ Solid salt treated with dil. $H_2SO_4$ | List-$II$ Anion detected |
| $A.$ Effervescence of colourless gas | $I.$ $NO_2^-$ |
| $B.$ Gas with smell of rotten egg | $II.$ $CO_3^{2-}$ |
| $C.$ Yellowish green gas with pungent and suffocating smell | $III.$ $S^{2-}$ |
| $D.$ Brown fumes | $IV.$ $Cl^{-}$ |
Choose the correct answer from the options given below:
Difficult
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View SolutionWhich of the following solid salt on heating with solid $K_2Cr_2O_7$ and conc. $H_2SO_4$ evolves orange-red vapours that turn an aqueous $NaOH$ solution yellow?
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