AIIMS 2018 | Solid State Question 5 | Chemistry

Niobium crystallises in body centred cubic structure. If density is $$8.55 \mathrm{~g} \mathrm{~cm}^{-3}$$, then the atomic radius of niobium is (atomic mass of niobium $$=93 u$$ )

163 pm

143 pm

182 $$\mathop A\limits^o $$

152 $$\mathop A\limits^o $$

AIIMS 2018

MCQ (Single Correct Answer)

-0.33

A solid has a structure in which W atoms are located at the corners of a cubic lattice. O atoms at the centre of edges and Na atom at centre of the cube. The formula for the compound is

$$\mathrm{NaWO}_2$$

$$\mathrm{NaWO}_3$$

$$\mathrm{Na}_2 \mathrm{WO}_3$$

$$\mathrm{NaWO}_4$$

AIIMS 2018

MCQ (Single Correct Answer)

-0.33

Assertion (A) Graphite is an example of tetragonal crystal system.

Reason (R) For a tetragonal system, $$a=b \neq c$$ and $$\alpha=\beta=90^{\circ}, \gamma=120^{\circ}$$.

Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true, but (R) is not the correct explanation of (A).

(A) is true and (R) is false.

Both (A) and (R) are false.

Questions Asked from MCQ (Single Correct Answer)

AIIMS 2019 (3) AIIMS 2018 (4)

AIIMS Subjects

Biology

Zoology

Human Health and Diseases Body Fluids and Its Circulation Locomotion and Movement Structural Organisation in Animals Digestion and Absorption Excretory Products and Their Elimination Chemical Coordination and Integration Human Reproduction Animal Kingdom Evolution