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What is chemical volcano ?...

What is chemical volcano ? 

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On heating crystals or red coloured ammonium dichromate a violent action accompanied by flashes of light and evoluciton of nitrogen takes place, leaving behind green coloured chromimum sesquioxide.
`(NH_(4))_(2)Cr_(2)O_(7)overset(Delta)rarr N_(2)+4H_(2)O+Cr_(2)O_(3)`
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AAKASH SERIES-D - BLOCK ELEMENTS-PRACTICE EXERCISE
  1. What is chemical volcano ?

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  2. Which of the following element has high density

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  3. Element with pseudooctet configuration in its outermost shell

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  4. The atomic number of element having pseudo inert gas configuration in ...

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  5. Which of the following ion has three unpaired d-electrons

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  6. Number of electrons present in the outer most shell of Cut ion

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  7. Highest oxidation state exhibited by a 3d-metal is

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  8. The highest oxidation state is exhibited by the transition metal with ...

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  9. Hydrated Cu^(2+) ions absorb light of ..... colour and transmit light ...

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  10. The colour of [Ti(H(2)O)(6)]^(3+) is due to

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  11. Complementary colour of green light of wavelength 5000 A^(@) is

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  12. A transitional metal X^(+2) in its hydrated state has six 3d electrons...

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  13. Magnetic moment of which of the following is zero

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  14. The magnetic moment of an ion in its +3 oxidation state is 3.85 BM. Th...

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  15. Common oxidation states of copper in its compounds are

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  16. The ion with highest magnetic moment is

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  17. The highest degree of paramagnetism is shown by

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  18. M^(x+) ion has magnetic moment 2.84 BM. Then 'x' is (Z of M = 23)

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  19. Magnetic moment of Mn^(+2) is 5.8 B.M. Hence the number of unpaired el...

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  20. Reagent used to reduce NO(3)^(-) to NH(3)

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  21. The common metal present in German Silver, Bell metal and Brass is

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