Question Text
Question 1 :
In a normal spinel types structure, the oxide ions are arranged in ccp whereas 1/8 tetrahedral holes are occupied by ZN<sub>2</sub>+ ions and 50% of octahedral holes are occupied by Fe<sub>3</sub>+ ions. The formula of the compound is -<br>
Question 2 :
In an arrangement of type ABABA... identical atoms of I layer A and III layer A are joined by a line passing through their centers. Suggest the correct statement.<br>
Question 4 :
$KF$ crystallizes in the $NaCl$ type structure. If the radius of $K^+$ ions $132$ pm and that of $F^-$ ion is $135$ pm, what is the closet $K-K$ distance?
Question 5 :
A solid compound contains $X, Y$ and $Z$ atoms in a cube lattice with $X$ atoms occupying the corners, $Y$ atoms in the body centred position and $Z$ atoms at the centre of the first of the unit cell. What is the empirical formula of the compound?
Question 7 :
$AB$ crystallises in a bcc lattice with edge length an equal to 387 pm. The distance between two oppositely charged ions in the lattice is:<br/>
Question 8 :
The density and edge length values for a crystallise elemens with $fcc$ lattice are $10 g$ $cm^{-3}$ and 400 pm, respectively. The number of unit cell in $32 g$ of this crystal is:
Question 9 :
Crystallize $CsCl$ has density 3.988 g $cm^{-3}.$ The volume occupied by a single $CsCl$ ion pair in the crystal will be:
Question 10 :
In a non stoichiometric sample of ferrous oxide with NaCl structure, the ratio of $Fe^{+3}$ to $Fe^{2+}$ was found to be 0.15. The fraction of octahedral sites occupied by vacancies is :<br/>
