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

An element crystallises in a b.c.c lattice with cell edge of 500 pm. The density of the element is 7.5g cm^-3. How many atoms are present in 300 g of the element?

Give reasons for the following: (CH₃)₂NH is more basic than (CH₃)₃N in an aqueous solution.

Give reason for the following:

Primary amines have higher boiling point than tertiary amines.

Arrange the following in the increasing order of their reactivity towards nucleophilic addition reaction:

C₆H₅COCH₃, CH₃-CHO, CH₃COCH₃

Out of white phosphorus and red phosphorus, which one is more reactive and why?

Why do gases always tend to be less soluble in liquids as the temperature is raised?

Draw the geometrical isomers of complex \[\ce{[Co(en)2Cl2]+}\].

Predict the products of the following reactions:

Arrange the following: C₂H₅NH₂, C₂H₅OH, (CH₃)₃N – in the increasing order of their boiling point

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