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प्रश्न
ln which pair highest oxidation states of transition metals are found:
विकल्प
nitriles and chlorides
fluorides and chlorides
fluorides and oxides
nitriles and oxides
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उत्तर
fluorides and oxides
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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)
Why do the transition elements have higher enthalpies of atomisation?
Which is a stronger reducing agent, Cr2+ or Fe2+ and why?
What may be the stable oxidation state of the transition element with the following d electron configuration in the ground state of its atom?
3d3
What are the characteristics of the transition elements and why are they called transition elements?
Describe the oxidising action of potassium dichromate and write the ionic equation for its reaction with iodide.
An antifriction alloy made up of antimony with tin and copper, which is extensively used in machine bearings is called _______.
(A) Duralumin
(B) Babbitt metal
(C) Spiegeleisen
(D) Amalgam
Which one of the following ions is coloured?
Transition metals with lowest melting point is ______.
In lake test for Al3+ ions, there is the formation of coloured ‘floating lake’. It is due to ______.
Why is \[\ce{HCl}\] not used to make the medium acidic in oxidation reactions of \[\ce{KMnO4}\] in acidic medium?
Transition elements show magnetic moment due to spin and orbital motion of electrons. Which of the following metallic ions have almost same spin only magnetic moment?
(i) \[\ce{Co^{2+}}\]
(ii) \[\ce{Cr^{2+}}\]
(iii) \[\ce{Mn^{2+}}\]
(iv) \[\ce{Cr^{3+}}\]
Transition elements form binary compounds with halogens. Which of the following elements will form \[\ce{MF3}\] type compounds?
(i) \[\ce{Cr}\]
(ii) \[\ce{Co}\]
(iii) \[\ce{Cu}\]
(iv) \[\ce{Ni}\]
Assertion: The highest oxidation state of osmium is +8.
Reason: Osmium is a 5d-block element.
Identify A to E and also explain the reactions involved.
Identify the metal and justify your answer.
Carbonyl \[\ce{M(CO)5}\]
A metallic ion 'M' reacts with chloride ion to form white precipitate which is readily soluble in aqueous ammonia. Identify 'M'?
The element with atomic number 46 belongs to
Which of the following is non-metallic?
The product of oxidation of I– with \[\ce{MnO^{-}4}\] in alkaline medium is:-
Why is the `"E"_(("V"^(3+)//"V"^(2+)))^"o"` value for vanadium comparatively low?
Account for the following:
Transition metals form alloys.
The number of terminal oxygen atoms present in the product B obtained from the following reactions is:
\[\ce{FeCr2O4 + Na2CO3 + O2 -> A + Fe2O3 + CO2}\]
\[\ce{A + H^+ -> B + H2O + Na^+}\]
Complete the following reaction and justify that it is a disproportionation reaction:
\[\ce{3MnO^{2-}4 + 4H^+ -> \underline{}\underline{}\underline{}\underline{} + \underline{}\underline{}\underline{}\underline{} + 2H2O}\]
A transition element X has an electronic configuration [Ar]4s23d3. Predict its likely oxidation states.
Account for the following:
Copper has an exceptionally positive `"E"_("M"^(2+)//"M")^0` value.
Give two similarities in the properties of Sc and Zn.
Give a reason for the following.
Some transition metals and their compounds get attracted towards the magnetic field.
Why are interstitial compounds well known for transition metals?
