1. Curd and sour substances should not be kept in brass and copper vessels because these substances are acidic in nature. When they come in contact with copper or brass, they react with the metal and form toxic compounds which can be harmful if consumed. This is due to the fact that copper and brass can easily be corroded by the acid present in these food items.

2. Hydrogen gas is usually liberated when an acid reacts with a metal. For example, when hydrochloric acid reacts with zinc metal, zinc chloride and hydrogen gas are formed. The chemical equation for this reaction is:
2HCl(aq) + Zn(s) → ZnCl2(aq) + H2(g)
To test for the presence of hydrogen gas, you can perform the 'pop' test. In this test, you bring a burning splint near the mouth of the test tube containing the gas. If the gas is hydrogen, it will burn with a 'pop' sound.

3. When a metal compound A reacts with dilute hydrochloric acid, the reaction produces a gas that extinguishes a burning candle. This indicates that the gas is likely to be carbon dioxide. If one of the compounds formed is calcium chloride, then the metal compound A is likely to be calcium carbonate. The balanced chemical equation for this reaction is:
CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l)

Question

1. Curd and sour substances should not be kept in brass and copper vessels because these substances are acidic in nature. When they come in contact with copper or brass, they react with the metal and form toxic compounds which can be harmful if consumed. This is due to the fact that copper and brass can easily be corroded by the acid present in these food items.

2. Hydrogen gas is usually liberated when an acid reacts with a metal. For example, when hydrochloric acid reacts with zinc metal, zinc chloride and hydrogen gas are formed. The chemical equation for this reaction is: 
   2HCl(aq) + Zn(s) → ZnCl2(aq) + H2(g)
   To test for the presence of hydrogen gas, you can perform the 'pop' test. In this test, you bring a burning splint near the mouth of the test tube containing the gas. If the gas is hydrogen, it will burn with a 'pop' sound.

3. When a metal compound A reacts with dilute hydrochloric acid, the reaction produces a gas that extinguishes a burning candle. This indicates that the gas is likely to be carbon dioxide. If one of the compounds formed is calcium chloride, then the metal compound A is likely to be calcium carbonate. The balanced chemical equation for this reaction is:
   CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l)

Knowee AI · Accepted Answer

1. Curd and sour substances should not be kept in brass and copper vessels because these substances are acidic in nature. When they come in contact with copper or brass, they react with the metal and form toxic compounds which can be harmful if consumed. This is due to the fact that copper and brass can easily be corroded by the acid present in these food items.

2. Hydrogen gas is usually liberated when an acid reacts with a metal. For example, when hydrochloric acid reacts with zinc metal, zinc chloride and hydrogen gas are formed. The chemical equation for this reaction is: 
   2HCl(aq) + Zn(s) → ZnCl2(aq) + H2(g)
   To test for the presence of hydrogen gas, you can perform the 'pop' test. In this test, you bring a burning splint near the mouth of the test tube containing the gas. If the gas is hydrogen, it will burn with a 'pop' sound.

3. When a metal compound A reacts with dilute hydrochloric acid, the reaction produces a gas that extinguishes a burning candle. This indicates that the gas is likely to be carbon dioxide. If one of the compounds formed is calcium chloride, then the metal compound A is likely to be calcium carbonate. The balanced chemical equation for this reaction is:
   CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l)

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