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CBSE Class 10 Answered

Why our hand burns when HCI falls on hand?
Asked by rushitakle2232 | 05 May, 2020, 11:29: PM
answered-by-expert Expert Answer
Acids are corrosive in nature which means they damage the skin. So, HCl is a strong acid and due to its corrosive nature, it damages skin tissues and causes burning of the skin. Biochemically, acids produce hydronium ions which react with fats and lipids of the skin layer in a destructive manner and cause burning.
Answered by Ravi | 06 May, 2020, 05:01: PM

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CBSE 10 - Chemistry
1.A farmer has grown the petunia flowers on his field. He observed that the colour of the flowers started changing from blue to reddish purple. • What could be the possible reason for the change in colour? ⚫ What role is played by petunia flowers? • Suggest any two substances playing the same role in the field of agriculture. • What should be added by the farmer to treat the soil? What type of reaction will take place during treatment of soil? 2. A metal X reacts with HCI to liberate gas A but its compound Y releases gas B with HCI along with the salt CaCl,. Name the metal X. • Identify gas A and how will you test for it? ⚫ Name the salt Y and give its molecular formula. • Identify gas B and how will you test for it? What type of reaction takes place when X reacts with HCI? 3. A sodium salt 'A' is used while baking a cake. It makes the cake fluffy and spongy due to the release of gas 'B'. Identify salt 'A'. ⚫ What is the common name of this salt? ⚫ Which gas is released during the process? • How will you test for gas 'B'? 4. Anita's mother asked her to store the pickle in some bowl. She kept the pickle in a brass bowl. Was she right in doing that? Why or why not?
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CBSE 10 - Chemistry
Among the following given substances, which ones when added to sulphuric acid solution can increase its pH to 7? A- Antacid B- Water C- Baking soda  D- Glass cleaner
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