Question

1. Why should curd and sour substances not be keept 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

Answer 1

Answer:

Answer 1st:-

sour substances are cidic in nature,i.e, they have acids in them. So, when they are kept in brass or copper vessels, they react with them and form poisonous or better to say toxic elements which may prove harmful for human body. So they are not kept in metal containers.

Answer 2nd :-

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.

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Answer 2

Answer:

acidic substances like curd and sour substances show their acidity by releasing hydrogen ion.

these ions of hydrogen react with the copper atoms present in the brass and copper vessels.

the reaction between copper and hydrogen will not only destroyed the vessel but also spoil the food.

hence it is advised to keep any sour and acidic substances in a a steel vessel which is considered to be non reactive

acids react with metal to form hydrogen gas and salt.

example:-

Al (s) + HCl (aq) ----⟩ AlCl3 (aq) + H2 (g)

you can test the presence of hydrogen by the fact that hydrogen gas burns with a pop

• take a test tube
• add some hydrochloric acid in test tube
• but a small piece of metal such as aluminium or zinc
• when bubbles starts coming out bring a matchstick near the mouth

you will hear a pop sound

Step-by-step explanation:

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