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

What is the basic theme of organisation in the periodic table?

Explain the Formation of a Chemical Bond.

Write Lewis symbols for the following atoms and ions: S and S^2–.

Write Lewis symbols for the following atoms and ions: Al and Al³⁺.

Write Lewis symbols for the following atoms and ions H and H^–.

Use Lewis symbols to show electron transfer between the following atoms to form cations and anions:-

K and S

Use Lewis symbols to show electron transfer between the following atoms to form cations and anions:

Ca and O

Use Lewis symbols to show electron transfer between the following atoms to form cations and anions:

Al and N

A thermodynamic state function is a quantity ______.

For an isolated system, ΔU = 0, what will be ΔS?

What are the common chemical features of alkali metals?

Why are alkali metals not found in nature?

Explain why alkali and alkaline earth metals cannot be obtained by chemical reduction methods?

Why are potassium and cesium, rather than lithium used in photoelectric cells?

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?