HSC Science इयत्ता १२ - Tamil Nadu Board of Secondary Education Question Bank Solutions

Potassium has a bcc structure with nearest neighbor distance 4.52 A⁰. its atomic weight is 39. its density will be

Explain briefly seven types of unit cells.

Calculate the number of atoms in a fcc unit cell.

What is meant by the term “coordination number”?

What is the coordination number of atoms in a bcc structure?

An element has bcc structure with a cell edge of 288 pm. The density of the element is 7.2 g cm⁻³. How many atoms are present in 208 g of the element?

Aluminium crystallizes in a cubic close packed structure. Its metallic radius is 125 pm. calculate the edge length of the unit cell.

KF crystallizes in fcc structure like sodium chloride. calculate the distance between K⁺ and F⁻ in KF.
(Given: density of KF is 2.48 g cm⁻³)

An atom crystallizes in fcc crystal lattice and has a density of 10 g cm⁻³ with unit cell edge length of 100 pm. calculate the number of atoms present in 1 g of crystal.

Atoms X and Y form bcc crystalline structure. Atom X is present at the corners of the cube and Y is at the centre of the cube. What is the formula of the compound?

Sodium metal crystallizes in bcc structure with the edge length of the unit cell 4.3 × 10⁻⁸ cm. calculate the radius of a sodium atom.

Explain pseudo-first-order reaction with an example.

Derive an expression for Ostwald’s dilution law.

Fog is colloidal solution of ____________.

Assertion: Coagulation power of Al³⁺ is more than Na⁺.

Reason: greater the valency of the flocculating ion added, greater is its power to cause precipitation.

Statement: To stop bleeding from an injury, ferric chloride can be applied. Which comment about the statement is justified?

Hair cream is ____________.

Which one of the following is correctly matched?

The most effective electrolyte for the coagulation of As₂S₃ Sol is ____________.

Which one of the is not a surfactant?