Curd and other sour substances contain acids. Therefore, when they are kept in brass and copper vessels, the metal reacts with the acid to liberate hydrogen gas and harmful products, thereby spoiling the food. Metal + Acid → Salt + Hydrogen gas 𝑍𝑛+2𝐻₂𝑆𝑂₄→ 𝑍𝑛(𝑆𝑂₄)2 +2𝐻₂
Curd and other sour substances contain acids. Therefore, when they are kept in brass and copper vessels, the metal reacts with the acid to liberate hydrogen gas and harmful products, thereby spoiling the food.
Metal + Acid → Salt + Hydrogen gas
𝑍𝑛+2𝐻₂𝑆𝑂₄→ 𝑍𝑛(𝑆𝑂₄)2 +2𝐻₂
If the colour of red litmus paper gets changed to blue, then it is a base and if there is no colour change, then it is either acidic or neutral. Thus, basic solution can be easily identified. Let us mark the three test tubes as A, B, and C. A drop of the solution in A is put on the red litmus paper.Read more
If the colour of red litmus paper gets changed to blue, then it is a base and if there is no colour change, then it is either acidic or neutral. Thus, basic solution can be easily identified.
Let us mark the three test tubes as A, B, and C. A drop of the solution in A is put on the red litmus paper. Same is repeated with solution B and C.
If either of them changes colour to blue, then it is basic. Therefore, out of three, one is eliminated.
Out of the remaining two, any one can be acidic or neutral. Now a drop of basic solution is mixed with a drop of each of the remaining two solutions separately and then the nature of the drops of the mixtures is checked.
If the colour of red litmus turns blue, then the second solution is neutral and if there is no change in colour, then the second solution is acidic.
This is because acidic and basic solutions neutralize each other. Hence, we can distinguish between the three types of solutions.
Important uses of Washing Soda • Sodium carbonate (washing soda) is used in glass, soap and paper industries. • It is used in the manufacture of sodium compounds such as borax. • Sodium carbonate can be used as a cleaning agent for domestic purposes. • It is used for removing permanent hardness of wRead more
Important uses of Washing Soda
• Sodium carbonate (washing soda) is used in glass, soap and paper industries.
• It is used in the manufacture of sodium compounds such as borax.
• Sodium carbonate can be used as a cleaning agent for domestic purposes.
• It is used for removing permanent hardness of water.
Important uses of Baking Soda
• It is used to make bread or cake soft and spongy.
• It is used as antacids. Being alkaline, it neutralises excess acid in the stomach and provides relief.
• It is also used in soda-acid fire extinguishers.
Plaster of Paris (POP) should be stored in a moisture-proof container because Plaster of Paris, a powdery mass, absorbs water (moisture) to form a hard solid known as gypsum. CaSO₄.1/2H₂O+ 3/2H₂O → CaSO₄.2H₂O
Plaster of Paris (POP) should be stored in a moisture-proof container because Plaster of Paris, a powdery mass, absorbs water (moisture) to form a hard solid known as gypsum.
(a) The milkman shifts the pH of the fresh milk from 6 to slightly alkaline because in alkaline condition, so that it takes longer time to be spoiled (become acidic). (b) Since this milk is slightly basic than usual milk, acids produced to set the curd are neutralized by the base. Therefore, it takeRead more
(a) The milkman shifts the pH of the fresh milk from 6 to slightly alkaline because in alkaline condition, so that it takes longer time to be spoiled (become acidic).
(b) Since this milk is slightly basic than usual milk, acids produced to set the curd are neutralized by the base. Therefore, it takes a longer time for the curd to set.
Why should curd and sour substances not be kept in brass and copper vessels?
Curd and other sour substances contain acids. Therefore, when they are kept in brass and copper vessels, the metal reacts with the acid to liberate hydrogen gas and harmful products, thereby spoiling the food. Metal + Acid → Salt + Hydrogen gas 𝑍𝑛+2𝐻₂𝑆𝑂₄→ 𝑍𝑛(𝑆𝑂₄)2 +2𝐻₂
Curd and other sour substances contain acids. Therefore, when they are kept in brass and copper vessels, the metal reacts with the acid to liberate hydrogen gas and harmful products, thereby spoiling the food.
See lessMetal + Acid → Salt + Hydrogen gas
𝑍𝑛+2𝐻₂𝑆𝑂₄→ 𝑍𝑛(𝑆𝑂₄)2 +2𝐻₂
You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?
If the colour of red litmus paper gets changed to blue, then it is a base and if there is no colour change, then it is either acidic or neutral. Thus, basic solution can be easily identified. Let us mark the three test tubes as A, B, and C. A drop of the solution in A is put on the red litmus paper.Read more
If the colour of red litmus paper gets changed to blue, then it is a base and if there is no colour change, then it is either acidic or neutral. Thus, basic solution can be easily identified.
Let us mark the three test tubes as A, B, and C. A drop of the solution in A is put on the red litmus paper. Same is repeated with solution B and C.
If either of them changes colour to blue, then it is basic. Therefore, out of three, one is eliminated.
Out of the remaining two, any one can be acidic or neutral. Now a drop of basic solution is mixed with a drop of each of the remaining two solutions separately and then the nature of the drops of the mixtures is checked.
If the colour of red litmus turns blue, then the second solution is neutral and if there is no change in colour, then the second solution is acidic.
This is because acidic and basic solutions neutralize each other. Hence, we can distinguish between the three types of solutions.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-2/
Give two important uses of washing soda and baking soda
Important uses of Washing Soda • Sodium carbonate (washing soda) is used in glass, soap and paper industries. • It is used in the manufacture of sodium compounds such as borax. • Sodium carbonate can be used as a cleaning agent for domestic purposes. • It is used for removing permanent hardness of wRead more
Important uses of Washing Soda
• Sodium carbonate (washing soda) is used in glass, soap and paper industries.
• It is used in the manufacture of sodium compounds such as borax.
• Sodium carbonate can be used as a cleaning agent for domestic purposes.
• It is used for removing permanent hardness of water.
Important uses of Baking Soda
• It is used to make bread or cake soft and spongy.
• It is used as antacids. Being alkaline, it neutralises excess acid in the stomach and provides relief.
• It is also used in soda-acid fire extinguishers.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-2/
Plaster of Paris should be stored in a moisture-proof container. Explain why?
Plaster of Paris (POP) should be stored in a moisture-proof container because Plaster of Paris, a powdery mass, absorbs water (moisture) to form a hard solid known as gypsum. CaSO₄.1/2H₂O+ 3/2H₂O → CaSO₄.2H₂O
Plaster of Paris (POP) should be stored in a moisture-proof container because Plaster of Paris, a powdery mass, absorbs water (moisture) to form a hard solid known as gypsum.
CaSO₄.1/2H₂O+ 3/2H₂O → CaSO₄.2H₂O
See lessA milkman adds a very small amount of baking soda to fresh milk.
(a) The milkman shifts the pH of the fresh milk from 6 to slightly alkaline because in alkaline condition, so that it takes longer time to be spoiled (become acidic). (b) Since this milk is slightly basic than usual milk, acids produced to set the curd are neutralized by the base. Therefore, it takeRead more
(a) The milkman shifts the pH of the fresh milk from 6 to slightly alkaline because in alkaline condition, so that it takes longer time to be spoiled (become acidic).
(b) Since this milk is slightly basic than usual milk, acids produced to set the curd are neutralized by the base. Therefore, it takes a longer time for the curd to set.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-2/