Question

D.Very Short Answer Question.
1.Which acid is produced in our stomach?
2. Name any two bases.
3. What is acid rain?
4.Give one example of a neutral substance​

Answer 1

Answer :

(a) Hydrochloric Acid

(b) Turmeric and Pheneptholien

(c) Acid rain, or acid deposition, is a broad term that includes any form of precipitation with acidic components, such as sulfuric or nitric acid that fall to the ground from the atmosphere in wet or dry forms.  This can include rain, snow, fog, hail or even dust that is acidic.  

(d) Water is the most common example of neutral substances. As whether you put red or blue litmus paper in it the colour never ever changes.

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Answer 2

1. HCL acid is produced in our stomach.

• The full form of HCL is Hydrochloric acid.
• The digestive juice contains HCL.
• It is secreted by Gastric glands.
• HCL kills harmful bacteria present in food.
• It also provides acidic medium for the activation of pepsin

2. Sodium hydroxide and calcium hydroxide are the two examples of bases.

• $\bf{ Bases :}$ Bases are the chemical substances which taste bitter.
• They are soapy in touch.
• They turn litmus paper red into blue.

3. Acid rain is a precipitation of acidic substances such as sulfur dioxide and nitrogen oxides. The pollutants like sulfur dioxide and nitrogen oxides reacts with water vapour present in the environment to form sulphuric acid and nitric acid. Then the acid drops down along with rain, making rain acidic. this is called acid rain.

Causes of acid rain -

• Damage skin
• Destroy plants
• Acid rains corrodes the marble of the monument.

4. Salt, water and oil are the examples of neutral substance.

• $\bf{ Neutral \:substance :}$ These are the substances which has no property of acid and base.
• They does not change the colour of litmus paper.
• They have equal number of hydroxyl and hydrogen ions.