HSC Science (Computer Science) इयत्ता १२ वी - Maharashtra State Board Important Questions for Chemistry

The density of iron crystal is 8.54-gram cm^–3. If the edge length of the unit cell is 2.8 A° and atomic mass is 56 gram mol^–1, find the number of atoms in the unit cell.  (Given: Avogadro's number = 6.022x10²³,1A° = 1x10^-8 cm)

Distinguish between p-type and n-type semiconductors.

What is the ratio of octahedral holes to the number of anions in hexagonal closed packed structure?

Distinguish between crystalline solids and amorsphous solids.

Distinguish between crystalline solids and amorsphous solids.

What is the role of the following compound -
CaF₂ in metallurgy of aluminum?

Classify the following molecular solids into different types: 

1. HCl
2. CO₂
3. Solid ice
4. SO₂

Classify the following molecular solids into different types: 

1. HCl
2. CO₂
3. Solid ice
4. SO₂

Complete the following statement by selecting the correct alternative from the choices given: 

In a face-centered cubic lattice, atom (A) occupies the comer positions and atom (B) occupies the face centre positions. If one atom of (B) is missing from one of the face-centered points, the formula of the compound is:

Represent a cell consisting of Mg²⁺ | Mg half cell and Ag⁺
 | Ag half cell and write the cell reaction.
( `"E"_("Ag")^° = 0.799 "V", "E"_("Mg")^° = - 2.37 "V"`)

The density of silver having an atomic mass of 107.8 g mol^{- 1} is 10.8 g cm^-3. If the edge length of cubic unit cell is 4.05 × 10^{- 8}
 cm, find the number of silver atoms in the unit cell.
 ( N_A = 6.022 × 10²³, 1 Å = 10^-8 cm)

Number of types of orthorhombic unit cell is ___________.

Pyrolusite ore is _______.

Cu crystallizes in fcc unit cell with edge length of 495 pm. What is the radius of Cu atom?

Obtain the relationship between the density of a substance and the edge length of the unit cell.

The density of iridium is 22.4 g/cm³. The unit cell of iridium is fcc. Calculate the radius of iridium atom. Molar mass of iridium is 192.2 g/mol.

The following types of solids contain molecules as constituent particles?

A compound is made up of two elements X and Y and crystallizes in bcc structure. Atoms of X are present at the corners of the cube. Atoms of Y are present at the centre of the cube. The formula of the compound is ______.

A compound is made up of two elements X and Y and crystallizes in bcc structure. Atoms of X are present at the corners of the cube. Atoms of Y are present at the centre of the cube. The formula of the compound is ______.

Write the relationship between radius of atom and edge length of fcc unit cell.