Question
Classify carbohydrates and also give examples of each.
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Answer
self
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- Name the element of 3d transition series which shows maximum number of oxidation states. Why does it show so?
- which transition metal of 3d series has positive Eo(M2+/M) value and why?
- Out of Cr3+ and Mn3+, which is a stronger oxidizing agent and why?
- Name a member of the lanthanoid series which is well known to exhibit +2 oxidation state.
- Complete the following equation:
MnO-4+8H++5e-$→$
Which forces are responsible for the stability of $\alpha-\text{helix}?$ Why is it named as 3.613 helix?
→- Complete the following chemical equations for reactions:
i. $\text{MnO}_{4(aq)}^{-}+\text{S}_{2}\text{O}_{3(aq)}^{2-}+\text{H}_{2}\text{O}_{(l)}\rightarrow$
ii. $\text{Cr}_{2}\text{O}^{-}_{7(aq)}+\text{H}_{2}\text{S}_{(g)}+\text{H}^{+}_{(aq)}\rightarrow$
- Give an explanation for each of the following, observations:
- The gradual decrease in size (actinoid contraction) from element to element is greater among the .actinoids than that among the lanthanoids (lanthanoid contraction).
- The greatest number of oxidation states are exhibited by the members in the middle of a transition series.
- With the same d-orbital configuration (d4) Cr2+ ion is a reducing agent but Mn3+ ion is an oxidising agent.
Answer the following questions:
Give chemical reactions for the following observations:
Give chemical reactions for the following observations:
- Potassium permanganate is a good oxidising agent in basic medium.
- Inter convertibility of chromate ion and dichromate ion in aqueous solution depends upon pH of the solution.
- Potassium permanganate is thermally unstable at 513K.
Derive a formula to determine the molar mass of a solute by depression of freezing point.
What is crystal field theory? On the basis of this, explain the crystal field splitting in octahedral coordinaton compounds.
- The elements of 3d transition series are given as:
Sc Ti V Cr Mn Fe Co Ni Cu Zn
Answer the following:
- Which element has the highest m.p. and why?
- Which element is a strong oxidising agent in +3 oxidation state and why?
- Which element is soft and why?
- Write the equations involved in the preparation of Potassium dichromate from Sodium chromate (Na2CrO4).
Match the property given in Column I with the element given in Column II.
| | Column I (Property) | | Column II (Element) |
| (i) | Lanthanoid which shows +4 oxidation state | (a) | Pm |
| (ii) | Lanthanoid which can show +2 oxidation state | (b) | Ce |
| (iii) | Radioactive lanthanoid | (c) | Lu |
| (iv) | Lanthanoid which has 4f7 electronic configuration in +3 oxidation state | (d) | Eu |
| (v) | Lanthanoid which has 4f14 electronic configuration in +3 oxidation state | (e) | Gd |
| | | (f) | Dy |