Advertisements
Advertisements
प्रश्न
Which one is colourless anion?
विकल्प
\[\ce{HCO^-_3}\]
\[\ce{Cr2O^2-_4}\]
\[\ce{Cr2O^2-_7}\]
\[\ce{MnO^-_4}\]
Advertisements
उत्तर
\[\ce{HCO^-_3}\]
Explanation:
The bicarbonate ion \[\ce{(HCO^-_3)}\] is colourless because it is composed of representative elements (hydrogen, carbon, and oxygen) which do not possess partially filled d-orbitals or undergo charge-transfer transitions in the visible light spectrum. In contrast, the other options contain transition metals that exhibit vibrant colors due to charge-transfer transitions chromate \[\ce{(CrO^{2-}_4)}\] is yellow, dichromate \[\ce{(Cr2O^{2-}_7)}\] is orange, and permanganate \[\ce{(MnO^-_4)}\] is deep purple.
APPEARS IN
संबंधित प्रश्न
Identify the salts P and Q from the observations given below:
On performing the flame test salt P produces a lilac coloured flame and its solution gives a white precipitate with silver nitrate solution, which is soluble in Ammonium hydroxide solution.
State your observations when barium chloride solution is mixed with sodium sulphate solution.
Match the salts given in Column I with their method of preparation given in Column II.
| Column I | Column II | ||
| 1 | Pb(NO3)2 from PbO | A | Simple displacement |
| 2 | MgCl2 from Mg | B | Titration |
| 3 | FeCl3 from Fe | C | Neutralization |
| 4 | NaNO3 from NaOH | D | Precipitation |
| 5 | ZnCO3 from ZnSO4 | E | Combination |
State your observation when excess sodium hydroxide is added to calcium nitrate solution
Choose the correct answer from the options given below :
Color of ferrous ion is
State the colour of the residue formed when nitrate of calcium is strongly heated.
A given white crystalline salt was tested as follows:
The addition of barium chloride solution into this solution gave a white precipitate. What conclusions can be drawn for the observation?
A given white crystalline salt was tested as follows:
A flame test on the salt gave a persistent golden-yellow colourisation. What conclusions can be drawn for the observation?
Write balanced equation for a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.
Write a balanced equation for a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.
