Advertisements
Advertisements
Question
\[\ce{KMnO4}\] acts as an oxidising agent in acidic medium. The number of moles of \[\ce{KMnO4}\] that will be needed to react with one mole of sulphide ions in acidic solution is ______.
Options
`2/5`
`3/5`
`4/5`
`1/5`
Advertisements
Solution
KMnO4 acts as an oxidising agent in acidic medium. The number of moles of \[\ce{KMnO4}\] that will be needed to react with one mole of sulphide ions in acidic solution is \[\ce{2/5}\].
Explanation:
\[\ce{2Mno^{-}4 + 5S^2 + 16H^- -> 2Min^{2+} + 5S + 8H2O}\]
For 5 mole of S the number of moles of \[\ce{KMnO4 = 2}\]
For 1 mole of S the number of moles of \[\ce{KMnO4 = 2/5}\]
APPEARS IN
RELATED QUESTIONS
The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co
Answer the following: Write the element which shows maximum number of oxidation states. Give reason.
Which of the 3d series of the transition metals exhibits the largest number of oxidation states and why?
In what way is the electronic configuration of the transition elements different from that of the non-transition elements?
Following are the transition metal ions of 3d series:
Ti4+, V2+, Mn3+, Cr3+
(Atomic numbers: Ti = 22, V = 23, Mn = 25, Cr = 24)
Answer the following:
1) Which ion is most stable in an aqueous solution and why?
2) Which ion is a strong oxidising agent and why?
3) Which ion is colourless and why?
How would you account for the following?
Zr (Z = 40) and Hf (Z = 72) have almost identical radii.
Two metallic elements A and B have the following standard oxidation potentials: A = 0·40v B = - 0·80v. What would you expect if element A was added to an aqueous salt solution of element B? Give a reason for your answer.
Explain why transition elements form alloys.
Explain why Zn2+ salts are white whereas Cu2+ salts are coloured.
Transition metals with lowest melting point is ______.
Electronic configuration of Mn2+ is ____________.
The magnetic nature of elements depends on the presence of unpaired electrons. Identify the configuration of transition element, which shows highest magnetic moment.
Match the catalysts given in Column I with the processes given in Column II.
| Column I (Catalyst) | Column II (Process) |
| (i) \[\ce{Ni}\] in the presence of hydrogen | (a) Zieglar Natta catalyst |
| (ii) \[\ce{Cu2C12}\] | (b) Contact process |
| (iii) \[\ce{V2O5}\] | (c) Vegetable oil to ghee |
| (iv) Finely divided iron | (d) Sandmeyer reaction |
| (v) \[\ce{TiCl4 + Al (CH3)3}\] | (e) Haber's Process |
| (f) Decomposition of KCIO3 |
Assertion: The highest oxidation state of osmium is +8.
Reason: Osmium is a 5d-block element.
Sodium this sulphate is used in photography because of its:-
Agcl is soluble in NH4OH. The solubility is due to the information of:-
Which of the following ions has the maximum magnetic moment?
The number of terminal oxygen atoms present in the product B obtained from the following reactions is:
\[\ce{FeCr2O4 + Na2CO3 + O2 -> A + Fe2O3 + CO2}\]
\[\ce{A + H^+ -> B + H2O + Na^+}\]
The value of Δ0 for \[\ce{RhCl^{3-}6}\] is 243 KJ/mol which wavelength of light will promote an electron from. The colour of the complex is ______.
Account for the following:
Sc3+ is colourless whereas Ti3+ is coloured in an aqueous solution.
Which property of transition metals enables them to behave as catalysts?
