Long answer type questions.
1. What may happen when:
(a) Sodium is dropped on water?
(b) A copper nail is placed in the solution
of iron sulphate?
(c) Zinc pieces are added to hydrochloric
acid?
(d) Sulphur dioxide gas is dissolved in water?
(e ) Magnesium oxide is dissolved in water?
Answers
A) Reaction of sodium with water
Sodium metal reacts rapidly with water to form a colourless solution of sodium hydroxide (NaOH) and hydrogen gas (H2). The resulting solution is basic because of the dissolved hydroxide. The reaction is exothermic.
B) When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed in the surface of iron and the colour of copper sulphate solution changes from blue to pale green. The reaction shows that iron is more reactive than copper because it displaces copper from the copper sulphate solution.
C) When zinc reacts with hydrochloric acid, the reaction bubbles vigorously as hydrogen gas is produced. The production of a gas is also an indication that a chemical reaction is occurring. Zinc reacting with hydrochloric acid produces bubbles of hydrogen gas.
D) sulfur dioxide, chemical compound, SO2, a colorless gas with a pungent, suffocating odor. It is readily soluble in cold water, sparingly soluble in hot water, and soluble in alcohol, acetic acid, and sulfuric acid. It is corrosive to organic materials and dissolves in water to form sulfurous acid, H2SO3.
E) Here in the above chemical reaction, when magnisium oxide reacts with water, it forms Magnesium hydroxide.
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