Science (English Medium) Class 11 - CBSE Question Bank Solutions

When an alkali metal dissolves in liquid ammonia the solution can acquire different colours. Explain the reasons for this type of colour change.

Why are lithium salts commonly hydrated and those of the other alkali metal ions usually anhydrous?

Write a balanced equation for the reaction between KO₂ and water.

Write a balanced equation for the reaction between Na₂O and CO₂.

Which of the alkali metal is having least melting point?

Which one of the following alkali metals gives hydrated salts?

What is hybridization state of each carbon atom in the following compound?

C₆H₆

Indicate the σ and π bonds in the following molecules:

 CH₂ = C = CH₂

Indicate the σ and π bonds in the following molecules:

CH₃NO₂

Indicate the σ and π bonds in the following molecule:

HCONHCH₃

In the organic compound CH₂ = CH – CH₂ – CH₂ – C ≡ CH, the pair of hybridized orbitals involved in the formation of: C₂ – C₃ bond is ______.

Write the formulae for the following compound:

Mercury(II) chloride

What are the common physical features of alkali metals?

What is hybridization state of each carbon atom in the following compound?

CH₂ = C = O

What is hybridization state of each carbon atom in the following compound?

CH₃CH = CH₂

What is hybridization state of each carbon atom in the following compound?

(CH₃)₂CO

What is hybridization state of each carbon atom in the following compound?

CH₂ = CHCN

Consider the isoelectronic species, \[\ce{Na+, Mg^{2+}, F–}\] and \[\ce{O2-}\]. The correct order of increasing length of their radii is ______.

Choose the correct order of atomic radii of fluorine and neon (in pm) out of the options given below and justify your answer.

What do you understand by exothermic reaction and endothermic reaction? Give one example of each type.