Sodium hydroxide (a strong base) reacts with hydrochloric acid to form sodium chloride and water. NaOH(aq) +HCl(aq)NaCl(aq) +H2O(l) Since, in the reaction between an acid and a base both neutralize each other, it is known as neutralization reaction.

When a ray of light passes through the glass slab, then the angle of incident is found to be nearly equal to angle of emergence and greater than angle of refraction.

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Copper oxide is black in colour. When dilute hydrochloric acid is added in it, the colour of the solution becomes blue green due to formation of copper chloride.

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