(47) (a) Why should curd and sour substances not be
kept in brass and copper vessels ?
(b) 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?
Answers
Explanation:
a) curds and sour substances contains acid which will react with brass/copper vessels which may spoil the food as they react with the acid in the food and produce harmful products.
b)hydrogen
Mg + HCl ---> MgCl2 + H2
hydrogen burns with a 'pop' sound
Answer:
Answer:(A) Curd and sour substances contains acid. Acid reacts with metals to produce salt and hydrogen gas. So, if such substances are kept in copper container, the acid will react and the container will be corroded.
(B) Hydrogen gas is liberated when an acid reacts with a metal.
For example, when zinc metal reacts with dil. hydrogen is evolved and salt zinc chloride is formed as.
It can be tested by bringing a burning candle near the gas. The candle continues burning with a pop sound.