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

An element 'X' (At. mass = 40 g mol^-1) having f.c.c. the structure has unit cell edge length of 400 pm. Calculate the density of 'X' and the number of unit cells in 4 g of 'X'. (N_A = 6.022 × 10²³ mol^-1)

 Arrange the following in the increasing order of their pK_b values:

C₆H₅NH₂, C₂H₅NH₂, C₆H₅NHCH₃

Which allotrope of sulphur is thermally stable at room temperature ?

Write down the IUPAC name of the following complex :

[Cr(en)₃]Cl₃

What is the role of dilute NaCN in the extraction of gold ?

Illustrate the following reactions giving suitable example in each case 

Ammonolysis

Write the structures of main products when benzene diazonium chloride (C6 H5 N+2CI−)C6 H5 N2+CI- reacts with the  :  HBF₄/∆

 Write the structures of main products when benzene diazonium chloride (C6 H5 N+2CI−)C6 H5 N2+CI- reacts with the :Cu/HBr

Which reducing agent is employed to get copper from the leached low-grade copper ore?

Write the IUPAC name of the compound.

Write two differences between 'order of reaction' and 'molecularity of reaction'.

How will you convert the following?

Nitrobenzene into aniline

How will you convert the following?

Aniline into N−phenylethanamide

Write the IUPAC name of the compound

State Henry's Law. What is the effect of temperature on the solubility of a gas in a liquid?

Arrange the following in increasing order of basic strength :

C₆H₅NH₂, C₆H₅NHCH₃, C₆H₅N(CH₃)₂

What happens when Phenol is oxidised with Na₂Cr₂O₇/H⁺?

Name an element of lanthanoid series which is well knwon to shown +4 oxidation state. Is it a strong oxidising agent or reducing agent? 

What is lanthanoid contraction? Write the.............

Write the IUPAC name of the K₃[Fe(C₂O₄)₃].