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

In a process, 701 J of heat is absorbed by a system and 394 J of work is done by the system. What is the change in internal energy for the process?

What is smog?

How is classical smog different from photochemical smog?

Write down the reactions involved during the formation of photochemical smog.

What are the harmful effects of photochemical smog?

What are electron deficient compounds? Are BCl₃ and SiCl₄ electron deficient species? Explain

In what ways lithium shows similarities to magnesium in its chemical behaviour?

Why is Li₂CO₃ decomposed at a lower temperature whereas Na₂CO₃ at a higher temperature?

What happens when magnesium is burnt in air.

What happens when quick lime is heated with silica?

What happens when chlorine reacts with slaked lime?

What happens when calcium nitrate is heated?

Why is LiF almost insoluble in water whereas LiCl soluble not only in water but also in acetone?

Comment on the following observation:

Lithium is the only alkali metal to form a nitride directly.

Describe the bulk preparation of dihydrogen by the electrolytic method. What is the role of an electrolyte in this process?

How does the atomic hydrogen or oxy-hydrogen torch function for cutting and welding purposes? Explain.

What do you understand by the term syngas?

What do you understand by the term water-gas shift reaction?

What do you understand by the term fuel-cell?

Depict the galvanic cell in which the reaction takes place.

\[\ce{Zn_{(s)} + 2Ag+_{ (aq)} -> Zn^{2+}_{ (aq)} + 2Ag_{(s)}}\]

Further show:

1. Which of the electrode is negatively charged?
2. The carriers of the current in the cell.
3. Individual reaction at each electrode.