Question

guys...help me...qn33

Answer 1

$\huge\green{Assalamualykum}$

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Q▪34

Zinc oxide is white when cold but it turns yellow on heated because on heating it loses oxygen

ZnO ---------on heating--------------> Zn + 1/2O2

This is called Metal excess defect

$\huge\blue{OPTION C IS CORRECT }$

Q ▪33

there are 1 units of NaCl in each cell, there are 3

Na + ions in the edge centers.

So, 1 Al3+will replace 3 Na+ions.

3/4 moles of Na+ will replace by 1/4 mol Al3+(for electrically neutral), and the residual Na+ions in the crystal are 1/4 moles

.

Therefore, in the crystal, 1/2 of the mole of the lattice sites will occupy 1/2 moles (1/4 moles of Al3+ + 1/4 moles of Na+cations, so the vacant sites:

1/2 mol = 1/2 * 6.02 * 10^23

= 3.0125 * 10^23

.

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$\huge\pink{INSHALLAH it will help U}$

Answer 2

hey mate
refer to attachment