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प्रश्न
Match the properties given in Column I with the metals given in Column II.
| Column I (Property) | Column II (Metal) | |
| (i) | An element which can show +8 oxidation state | (a) \[\ce{Mn}\] |
| (ii) | 3d block element that can show | (b) \[\ce{Cr}\] |
| upto +7 oxidation state | (c) \[\ce{Os}\] | |
| (iii) | 3d block element with highest melting point | (d) \[\ce{Fe}\] |
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उत्तर
| Column I (Property) | Column II (Metal) | |
| (i) | An element which can show +8 oxidation state | (c) \[\ce{Os}\] |
| (ii) | 3d block element that can show upto +7 oxidation state |
(a) \[\ce{Mn}\] |
| (iii) | 3d block element with highest melting point | (b) \[\ce{Cr}\] |
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संबंधित प्रश्न
Which metal in the first transition series (3d series) exhibits + 1 oxidation state most frequently and why?
Account for the following:
Cr2+ is a strong reducing agent.
Give reasons:
Transition metals show variable oxidation states.
Account for the following:
Zn is not considered as a transition element.
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?
Describe the oxidising action of potassium dichromate and write the ionic equation for its reaction with iodide.
For M2+/M and M3+/M2+ systems, the E° values for some metals are as follows:
| Cr2+/Cr | −0.9 V |
| Mn2+/Mn | −1.2 V |
| Fe2+/Fe | −0.4 V |
| Cr3/Cr2+ | −0.4 V |
| Mn3+/Mn2+ | +1.5 V |
| Fe3+/Fe2+ | +0.8 V |
Use this data to comment upon:
- The stability of Fe3+ in acid solution as compared to that of Cr3+ or Mn3+ and
- the ease with which iron can be oxidised as compared to a similar process for either chromium or manganese metal.
Complete and balance the following chemical equations
`Fe^(2+) + MnO_4^(-) + H^+ ->`
Explain why Zn2+ salts are white whereas Cu2+ salts are coloured.
Explain why Mn2+ is more stable than Fe2+ towards oxidation to +3 state. (At. no. of Mn = 25, Fe = 26)
Why is \[\ce{HCl}\] not used to make the medium acidic in oxidation reactions of \[\ce{KMnO4}\] in acidic medium?
Explain why does colour of KMnO4 disappear when oxalic acid is added to its solution in acidic medium.
Mention any three processes where transition metals act as catalysts.
Which of the following maxm magnetic moment?
The product of oxidation of I– with \[\ce{MnO^{-}4}\] in alkaline medium is:-
Give reasons for the following statement:
Zn, Cd, and Hg are soft metals.
Which of the following characteristics of transition metals is associated with their catalytic activity?
The second ionization enthalpies of chromium and manganese are 1592 and 1509 kJ/mol respectively. Explain the lower value of Mn.
Compare the general characteristics of the first series of the transition metals with those of the second and third series metals in the respective vertical columns. Give special emphasis on the following point:
Atomic sizes
