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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

When a brown compound of manganese (A) is treated with HCl it gives a gas (B). The gas taken in excess, reacts with NHX3 to give an explosive compound (C). Identify compounds A, B and C.

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प्रश्न

When a brown compound of manganese (A) is treated with \[\ce{HCl}\] it gives a gas (B). The gas taken in excess, reacts with \[\ce{NH3}\] to give an explosive compound (C). Identify compounds A, B and C.

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उत्तर

The compounds A, B and C are as follows:

A = \[\ce{MnO2}\], B = \[\ce{Cl2}\], C = \[\ce{NCl3}\]

The reactions are explained as under:

\[\ce{\underset{(A)}{MnO2} + 4HCl -> MnCl2 + \underset{(B)}{Cl2} + 2H2O}\]

\[\ce{\underset{(Excess)}{3Cl2} + NH3 -> \underset{(C)}{NCl3} + 3HCl}\]

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पाठ 8: The d-and f-Block Elements - Multiple Choice Questions (Type - I) [पृष्ठ १११]

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एनसीईआरटी एक्झांप्लर Chemistry Exemplar [English] Class 12
पाठ 8 The d-and f-Block Elements
Multiple Choice Questions (Type - I) | Q 38 | पृष्ठ १११

संबंधित प्रश्‍न

ln which pair highest oxidation states of transition metals are found:


Account for the following:

Cu+2 salts are coloured, while Zn2+ salts are white.


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?


Calculate the ‘spin only’ magnetic moment of \[\ce{M^{2+}_{( aq)}}\] ion (Z = 27).


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:

  1. The stability of Fe3+ in acid solution as compared to that of Cr3+ or Mn3+ and
  2. the ease with which iron can be oxidised as compared to a similar process for either chromium or manganese metal.

Generally transition elements form coloured salts due to the presence of unpaired electrons. Which of the following compounds will be coloured in solid-state?


Why is \[\ce{HCl}\] not used to make the medium acidic in oxidation reactions of \[\ce{KMnO4}\] in acidic medium?


Mention the type of compounds formed when small atoms like H, C and N get trapped inside the crystal lattice of transition metals. Also give physical and chemical characteristics of these compounds.


Mention any three processes where transition metals act as catalysts.


The element with atomic number 46 belongs to


The standard electrode potentials of four elements A, B, C and D are – 3.05, – 1.66, – 0.40 and + 0.80. The highest chemical reactivity will be exhibited by


Which of the following ions will exhibit colour in aqueous solution?


A complex in which dsp2 hybridisation takes place is ______.


Which of the following ions has the maximum magnetic moment?


Give reason for the following statement:

[Ti(H2O)]3+ is coloured while [Sc(H2O)6]3+ is colourless.


Write the ionic equation for reaction of KI with acidified KMnO4.


Why are interstitial compounds well known for transition metals?


Describe the oxidising action of potassium dichromate and write the ionic equation for its reaction with iron (II) solution.


Describe the oxidising action of potassium dichromate and write the ionic equation for its reaction with H2S.


‘Spin only’ magnetic moment is the same for which of the following ions?

  1. Ti3+
  2. Cr2+
  3. Mn2+
  4. Fe2+
  5. Sc3+

Choose the most appropriate answer from the options given below:


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