HSC Science (General) १२ वीं कक्षा - Maharashtra State Board Important Questions for Chemistry

Pyrolusite ore is _______.

The coordination number of atoms in bcc crystal lattice 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 ______.

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

If the total volume of a simple cubic unit cell is 6.817 × 10^-23 cm³, what is the volume occupied by particles in the unit cell?

Calculate the number of unit cells in 0.3 g of a species having density of 8.5 g/cm³ and unit cell edge length 3.25 × 10^-8 cm.

Calculate the packing efficiency for bcc lattice.

The unit cell of Na is bcc and its density is 0.97 g/cm³. What is the radius of a sodium atom if the molar mass of Na is 23 g/mol?

Derive the relationship between density of substance, its molar mass, and the unit cell edge length. Explain how you will calculate the number of particles, and a number of unit cells in x g of metal.

The coordination number of atoms in body-centred cubic structure (bcc) is ______.

Write the consequences of Schottky defect with reasons.

Explain metal deficiency defect with examples.

Aluminium crystallises in a cubic close-packed structure with a unit cell edge length of 353.6 pm. What is the radius of Al atom? How many unit cells are there in 1.00 cm³ of Al?

An element has a bee structure with unit cell edge length of 288 pm. How many unit cells and number of atoms are present in 200 g of the element?

Name a compound where Frenkel defect is found.

The relation between the radius of the sphere and the edge length in the body-centred cubic lattice is given by the formula ______.