Chemistry

Number of molecules   $=\frac{w\left(g\right)}{M\left(g\right)}*N_A$

=  $\frac{56}{28}*N_A$

= 2 N_A

Fe₃O₄ is a ferromagnetic substance

Malachite : CuCO3.Cu (OH)2

Azurite : 2CuCO3.Cu (OH)2

Cuprite : Cu₂O

Copper pyrite : Cu₂S.Fe₂S₃.

For BCC unit cell

$\sqrt[]{3}a=4r$

$a=\frac{4r}{\sqrt[]{3}}$

Y_A = p_a /p_a + p_b = 400 x ½ / 400 x ½ + 500 x ½ = 4/9

Higher the value of (ixM), higher will be the boiling point of solution.

For FCC lattice,

Packing efficiency = π/3√2

CsCl has BCC structure in which Cl^- is present at corners of cube and Cs+ at body centre.

The three fundamental laws of chemistry are - Law of Definite Proportions, Law of Conservation of Mass, and Law of Multiple Proportions.

The three types of chemical bonds are - ionic, metallic and covalent bonds. When the electrons transfer between the atoms, they form the Ionic bonds by producing charged ions that are attracted to each other. When atoms share electrons, covalent bonds are created. When metal atoms share a sea of delocalized electrons, metallic bonds get created.