(a) Describe the reaction of potassium with water. Write the equation of the reaction involved.
(b) Write an equation of the reaction of iron with steam, Indicate the physical state of all the reactants and products.
(c) Which gas is produced when dilute hydrochloric acid is added to a reactive metal?

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Solution

(a)Several small pieces of potassium metal were dropped into a large trough of tap water containing a universal indicator. The metal reacted with the water explosively producing small lilac flames. Several pieces broke up and could be seen to race along the surface of the water- the indicator in the water turned from green to purple.
Sodium metal reacts rapidly with water to form a colourless solution of sodium hydroxide (NaOH) and hydrogen gas $(H_{2})$

$2 K (s) + 2 H_{2} O (l) ⟶ 2 K O H (a q) + H_{2} (g)$

(b) $3 F e (s) + 3 H_{2} O (g) ⟶ F e_{3} O_{4} (a q) + 4 H_{2} (g)$

(c)Hydrogen gas is evolved when hydrochloric acid is added to a reactive metal. The chemical reaction when iron reacts with dilute sulphuric acid is

$F e + H_{2} S O_{4} ⟶ F e S O_{4} + H_{2}$

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Similar questions

Q. Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute

H_{2} S O_{4} .

Q. Question 4
Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute

H_{2} {SO}_{4}

Q. (a) What are metals? Name five metals.
(b) Name a metal which is so soft that it can be cut with a knife.
(c) Name the metal which is the best conductor of heat and electricity.
(d) What happens when a metal reacts with dilute hydrochloric acid? Explain with the help of an example.
(e) Write the equations for the reaction of:
(i) Magnesium with dilute hydrochloric acid
(ii) Aluminium with dilute hydrochloric acid
(iii) Zinc with dilute hydrochloric acid
(iv) Iron with dilute hydrochloric acid
Name the products formed in each case. Also indicate the physical states of all the substances involved.

(a) What happens when dilute hydrochloric acid is added to sodium carbonate ? Write a balanced chemical equation of the reaction involved.

(b) Which gas is liberated when dilute hydrochloric acid reacts with sodium carbonate ? How will you test for the presence of this gas ?

(a) Write happens when calcium reacts with water? Write the chemical equation of the reaction of calcium.
(b) Write the chemical equation of the reaction which takes place when iron reacts with dilute sulphuric acid. What happens when the gas produced is ignited with a burning matchstick?

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