This chapter is currently out of syllabus
1
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids. The formula of the compound is :
A
C3A4
B
C4A3
C
C2A3
D
C3A
2
NEET 2018
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Iron exhibits bcc structure at room temperature. Above 900°C, it transforms to fcc structure. The ratio of density of iron at room temperature to that at 900°C (assuming molar mass and atomic radii of iron remains constant with temperature) is
A
$${{\sqrt 3 } \over {\sqrt 2 }}$$
B
$${{4\sqrt 3 } \over {3\sqrt 2 }}$$
C
$${{3\sqrt 3 } \over {4\sqrt 2 }}$$
D
$${1 \over 2}$$
3
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion (Ca2+) and fluoride ion (F$$-$$) are
A
4 and 2
B
6 and 6
C
8 and 4
D
4 and 8
4
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The ionic radii of A+ and B$$-$$ ions are 0.98 $$ \times $$ 10$$-$$10 m and 1.81 $$ \times $$ 10$$-$$10 m. The coordination number of each ion in AB is
A
8
B
2
C
6
D
4
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