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Non-stoichiometric compounds are...

Non-stoichiometric compounds are

A

`Cu_(2)O`

B

`Cu_(2)S`

C

`FeO`

D

`Hg_(2)Ba_(2)YCaCu_(2)O_(7)`

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The correct Answer is:
A, B, C, D
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Assertion (A) : Non-stoichiometric compounds are called Bertholide compounds. NaCl and KCl crystal, when heated in an atmosphere of Na and K varpours, respectively, they impart violet and yellow colours to NaCl and KCl , respectively. Reason (R ) : Metal excess defect is due to the presence of extra cations atg the interstitial sites. The excess metal ions move to the interstitial sites and the electrons to the neighbouring sites. The colour results byt the excitation of these electrons by absorbing suitable energy from visible light. When the excited electroon comes back to the ground state, there is emission of radiation in the visible region and gives complimentary colour.

Non-stoichiometric compound have the properties of:

What are non-stoichiometric compounds ?

The non- stoichiometric compound Fe_(0.94)O is formed when x% of Fe^(2+) ions are replaced by as many 2//3 Fe^(3+) ions The value of x is:

The non-stoichiometric compound Fe_0.94O is formed when some Fe^(+2) ions are replaced by Fe^(+3) ions. What is the percentage of Fe^(+3) ions in this ionic lattice ?

An example of a non- stoichiometric compound is