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प्रश्न
Which of the following statements is not correct?
विकल्प
Copper liberates hydrogen from acids.
In its higher oxidation states, manganese forms stable compounds with oxygen and fluorine.
\[\ce{Mn^{3+}}\] and \[\ce{Co^{3+}}\] are oxidising agents in aqueous solution.
\[\ce{Ti^{2+}}\] and \[\ce{Cr^{2+}}\] are reducing agents in aqueous solution.
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उत्तर
Copper liberates hydrogen from acids.
Explanation:
Copper does not liberate hydrogen from acids.
\[\ce{Cu + 2H2SO4 -> CuSO4 + SO2 + 2H2O}\]
\[\ce{3Cu + 8HNO3 -> 3Cu (NO3)2 + 2NO + 4H2O}\]
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संबंधित प्रश्न
ln which pair highest oxidation states of transition metals are found:
Why do the transition elements have higher enthalpies of atomisation?
Out of Mn3+ and Cr3+, which is more paramagnetic and why ?
(Atomic nos. : Mn = 25, Cr = 24)
Which is a stronger reducing agent, Cr2+ or Fe2+ and why?
Which of the d-block elements may not be regarded as the transition elements?
Predict which of the following will be coloured in the aqueous solution?
Ti3+, V3+, Cu+, Sc3+, Mn2+, Fe3+ and Co2+. Give reasons for each.
How would you account for the following:
Of the d4 species, Cr2+ is strongly reducing while manganese (III) is strongly oxidising.
Calculate the number of unpaired electrons in the following gaseous ions:
Mn3+, Cr3+, V3+ and Ti3+. Which one of these is the most stable in an aqueous solution?
Why do transition metals exhibit higher enthalpy of atomization?
Which of the following ions show higher spin only magnetic moment value?
(i) \[\ce{Ti^3+}\]
(ii) \[\ce{Mn2+}\]
(iii) \[\ce{Fe2+}\]
(iv) \[\ce{Co3+}\]
EΘ of Cu is + 0.34V while that of Zn is – 0.76V. Explain.
Identify A to E and also explain the reactions involved.
Identify the metal and justify your answer.
Carbonyl \[\ce{M(CO)5}\]
Mercury is the only metal liquid at room temperature due to its:-
Why are all copper halides known except that copper iodide?
Give reason for the following statement:
[Ti(H2O)]3+ is coloured while [Sc(H2O)6]3+ is colourless.
The trend of which property is represented by the following graph?
The compounds of \[\ce{Ti^4+}\] ions are colourless due to ______.
Give a reason for the following:
Transition metals possess a great tendency to form complex compounds.
