Science (English Medium) कक्षा ११ - CBSE Question Bank Solutions

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.

Predict the product of electrolysis in the following:

An aqueous solution of AgNO₃ with silver electrodes.

Predict the product of electrolysis in the following:

An aqueous solution AgNO₃ with platinum electrodes.

Predict the product of electrolysis in the following:

A dilute solution of H₂SO₄ with platinum electrodes

Predict the product of electrolysis in the following:

An aqueous solution of CuCl₂ with platinum electrodes.

how can photochemical smog be controlled?

The bond between B and C will be ______.

Dipole-dipole forces act between the molecules possessing permanent dipole. Ends of dipoles possess ‘partial charges’. The partial charge is ______.

Dihydrogen can be prepared on commercial scale by different methods. In its preparation by the action of steam on hydrocarbons, a mixture of \[\ce{CO}\] and \[\ce{H2}\] gas is formed. It is known as:

(i) Water gas.

(ii) Syngas.

(iii) Producer gas.

(d) Industrial gas.