Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Chemistry

Draw one of the geometrical isomers of the complex [Pt(en)₂Cl₂]²⁺ which is optically active.

Draw the structure of the semicarbazone of ethanal.

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?

Draw the geometrical isomers of complex [Pt(NH₃)₂Cl₂].

How do you convert the following:

Aniline to phenol

Which allotrope of phosphorus is more reactive and why?

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 :

Write the structures of the main products when acetone (CH₃ − CO − CH₃) reacts with the following reagent :

H₂N − NHCONH₂/H⁺

What type of isomerism is exhibited by the complex [Co(en)₃]³⁺?

(en = ethane-1,2-diamine)

Write the products formed when CH₃CHO reacts with the following reagents : HCN

Write the products formed when CH₃CHO reacts with the following reagents : H₂N – OH

Define the following term:

Anomers 

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.