Science (English Medium) Class 12 - CBSE Question Bank Solutions for Chemistry

An element with molar mass 27 g mol⁻¹ forms a cubic unit cell with edge length 4.05 ✕ 10⁻⁸ cm. If its density is 2.7 g cm⁻³, what is the nature of the cubic unit cell?

How do you convert the following:

Aniline to phenol

Which allotrope of phosphorus is more reactive and why?

Write down the IUPAC name of the complex [Pt(en)₂Cl₂]²⁺. What type of isomerism is shown by this complex?

Arrange the following in increasing order of their basic strength :

C₆H₅ – NH₂, C₆H₅ – CH₂ – NH₂, C₆H₅ – NH – CH₃

Arrange the following in increasing order of their basic strength :

Account for the following :

Zr and Hf have almost similar atomic radii.

Write the IUPAC name of the complex [Cr(NH₃)₄ Cl₂]Cl.

Name a member of the lanthanoid series which is well known to exhibit +4 oxidation state.

Write the chemical equations to illustrate the following name reactions : Rosenmund reduction

How will you bring about the following conversion?

Benzoyl chloride to benzaldehyde.

Distinguish between Hexagonal and monoclinic unit cells

Distinguish between Face-centred and end-centred unit cells.

Explain how much portion of an atom located at (i) corner and (ii) body-centre of a cubic unit cell is part of its neighbouring unit cell.

An element with molar mass 2.7 × 10^-2 kg mol^-1 forms a cubic unit cell with edge length 405 pm. If its density is 2.7 × 103 kg m⁻³, what is the nature of the cubic unit cell?

What is the coordination number of atoms in a cubic close-packed structure?

How can you determine the atomic mass of an unknown metal if you know its density and the dimension of its unit cell? Explain.

H₂S, a toxic gas with rotten egg like smell, is used for the qualitative analysis. If the solubility of H₂S in water at STP is 0.195 m, calculate Henry’s law constant.

Henry’s law constant for CO₂ in water is 1.67 × 10⁸ Pa at 298 K. Calculate the quantity of CO₂ in 500 mL of soda water when packed under 2.5 atm CO₂ pressure at 298 K.

The partial pressure of ethane over a solution containing 6.56 × 10⁻³ g of ethane is 1 bar. If the solution contains 5.00 × 10⁻² g of ethane, then what shall be the partial pressure of the gas?