Advertisements
Advertisements
प्रश्न
Match the solutions given in Column I and the colours given in Column II.
| Column I (Aqueous solution of salt) |
Column II (Colour) |
| (i) \[\ce{FeSO2.7H2O}\] | (a) Green |
| (ii) \[\ce{NiCl2.4H2O}\] | (b) Light pink |
| (iii) \[\ce{MnCl2.4H2O}\] | (c) Blue |
| (iv) \[\ce{CoC12,6H2O}\] | (d) Pale green |
| (v) \[\ce{Cu2 Cl2}\] | (e) Pink |
| (f) Colourless |
Advertisements
उत्तर
| Column I (Aqueous solution of salt) |
Column II (Colour) |
| (i) \[\ce{FeSO2.7H2O}\] | (d) Pale green |
| (ii) \[\ce{NiCl2.4H2O}\] | (a) Green |
| (iii) \[\ce{MnCl2.4H2O}\] | (b) Light pink |
| (iv) \[\ce{CoC12,6H2O}\] | (e) Pink |
| (v) \[\ce{Cu2 Cl2}\] | (f) Colourless |
APPEARS IN
संबंधित प्रश्न
Which of the following cations are coloured in aqueous solutions and why ?
Sc3+, V3+, Ti4+, Mn2+ (At. Nos. Sc = 21, V = 23, Ti = 22, Mn = 25)
How would you account for the following?
Transition metals exhibit variable oxidation states.
In the series Sc (Z = 21) to Zn (Z = 30), the enthalpy of atomization of zinc is the lowest, i.e., 126 kJ mol−1. Why?
Which is a stronger reducing agent, Cr2+ or Fe2+ and why?
Describe the oxidising action of potassium dichromate and write the ionic equation for its reaction with iodide.
What are inner transition elements?
What can be inferred from the magnetic moment value of the following complex species?
| Example | Magnetic Moment (BM) |
| K2[MnCl4] | 5.9 |
An analysis shows that FeO has a non-stoichiometric composition with formula Fe0.95O. Give reason.
Account for the following :
Ti4+ is colourless whereas V4+ is coloured in an aqueous solutions.
Metallic radii of some transition elements are given below. Which of these elements will have highest density?
| Element | \[\ce{Fe}\] | \[\ce{Co}\] | \[\ce{Ni}\] | \[\ce{Cu}\] |
| Metallic radii/pm | 126 | 125 | 125 | 128 |
Interstitial compounds are formed when small atoms are trapped inside the crystal lattice of metals. Which of the following is not the characteristic property of interstitial compounds?
When a brown compound of manganese (A) is treated with \[\ce{HCl}\] it gives a gas (B). The gas taken in excess, reacts with \[\ce{NH3}\] to give an explosive compound (C). Identify compounds A, B and C.
Although fluorine is more electronegative than oxygen, but the ability of oxygen to stabilise higher oxidation states exceeds that of fluorine. Why?
Explain why does colour of KMnO4 disappear when oxalic acid is added to its solution in acidic medium.
While filling up of electrons in the atomic orbitals, the 4s orbital is filled before the 3d orbital but reverse happens during the ionisation of the atom. Explain why?
Identify the metal and justify your answer.
\[\ce{MO3F}\]
It has been observed that first ionization energy of 5 d series of transition elements are higher than that of 3d and 4d series, explain why?
Account for the following:
Ce4+ is a strong oxidising agent.
Assertion (A): Transition metals show their highest oxidation state with oxygen.
Reason (R): The ability of oxygen to form multiple bonds to metals.
