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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.
Answers
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:
1. Curd and sour substances should not be kept in copper or brass vessels , because they may react with the substances stored and make them toxic (since acids are sour in taste).
2.Hydrogen gas is mainly liberated when an acid reacts with metal.
eg.:- 2Al + 6HCl ――> 2AlCl3 + 3H2
3.CaCO3 + 2HCl ――> CaCl2 + CO2 + H2O
Step-by-step explanation:
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