Question

MOST IMPORTANT QUESTION
1. Why should curd and sour substances not be kept in brass and copper vessels?
2. Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?
3. Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.

Answer 1

Answer:

Ans 1. Curd and sour food substances contain acids; these acidic substances combine with metal. This reaction turns food to poison which damage people’s health.

Ans 2. When an acid reacts with any metal, salt and hydrogen gas are formed.

Ans 3. As metal compound released is Calcium Chloride the gas evolved here is CO2. Hence metal A should be Calcium Carbonate. Hence the reaction between Calcium Carbonate and HCl is CaCO3 (s) + 2HCl (Aq) → CaCl2( Aq) + CO2 (g) + H2O (l)

Step-by-step explanation:

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Answer 2

Answer:

1. curd and sour substances contain acid. They would react with surface of metal vessels such as that of brass and copper and produce harmful substances.So curd and sour substances should not be kept in brass and copper vessels.

2.Hydrogen gas is liberated when an acid reacts with a metal.

Eg. zinc reacts with dilute hydroge is evolved and salt zinc chloride is formed.It can be tested by bringing a burning candle near gas