Explain with the help chemical reaction: Two molecules of benzaldehyde are treated with conc. NaOH.

What is rust? Explain it with the help of a chemical reaction.

Explain with the help of nuclear reaction in each of the following cases, how the neutron to proton ratio changes during beta decay?

Write the balanced chemical equations for the reaction of Cl_2 with cold an dil. NaOH.

Write the balanced chemical equations for the reaction of Cl_2 with, cold and dil. NaOH.

Explain, with the help of a schematic diagram, the principle and working of a Light Emiting Diode. What criterion is kept in mind while choosing the semiconductor material for such a device ? Write any two advantages of light emiting diode over conventional incandescent lamps.

Write the balanced chemical equation for the reaction of CI_2 with hot and conc. NaOH. Is this reaction disproportionation reaction ? Justify.

Explain how enzymes influence rate of chemical reaction in a living cell.

Iqbal treated a lustrous, divalent element M with sodium hydroxide. He observed the formation of bubbles in reaction mixture. He made the same observations when this element was treated with hydrochloric acid. Suggest how can he identify the produced gas. write the chemical equations for both the reactions.